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UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

FORM 10-K

þ	ANNUAL REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934

For the fiscal year ended December 31, 2024

Or

o	TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934

Commission File Number 001-40217

Sun Country Airlines Holdings, Inc.

(Exact name of registrant as specified in its charter)

Delaware	82-4092570
(State or other jurisdiction of incorporation or organization)	(I.R.S. Employer Identification No.)
2005 Cargo Road
Minneapolis, Minnesota	55450
(Address of principal executive offices)	(Zip Code)

Registrant’s telephone number, including area code: (651) 681-3900

Securities registered pursuant to Section 12(b) of the Act:

Title of each class	Trading Symbol	Name of each exchange on which registered
Common Stock, par value $0.01 per share	SNCY	The Nasdaq Stock Market LLC

Indicate by check mark if the registrant is a well-known seasoned issuer, as defined in Rule 405 of the Securities Act.

Yes o No þ

Indicate by check mark if the registrant is not required to file reports pursuant to Section 13 or Section 15(d) of the Exchange Act.

Yes o No þ

Indicate by check mark whether the registrant (1) has filed all reports required to be filed by Section 13 or 15(d) of the Securities Exchange Act of 1934 during the preceding 12 months (or for such shorter period that the registrant was required to file such reports), and (2) has been subject to such filing requirements for the past 90 days.

Yes þ No o

Indicate by check mark whether the registrant has submitted electronically every Interactive Data File required to be submitted pursuant to Rule 405 of Regulation S-T (§232.405 of this chapter) during the preceding 12 months (or for such shorter period that the registrant was required to submit such files).

Yes þ No o

Indicate by check mark whether the registrant is a large accelerated filer, an accelerated filer, a non-accelerated filer, a smaller reporting company, or an emerging growth company. See the definitions of “large accelerated filer,” “accelerated filer,” “smaller reporting company,” and "emerging growth company" in Rule 12b-2 of the Exchange Act.

Large accelerated filer	o	Accelerated filer	þ	Non-accelerated filer	o
		Smaller reporting company	o	Emerging growth company	o

If an emerging growth company, indicate by check mark if the registrant has elected not to use the extended transition period for complying with any new or revised financial accounting standards provided pursuant to Section 13(a) of the Exchange Act. o

Indicate by check mark whether the registrant has filed a report on and attestation to its management’s assessment of the effectiveness of its internal control over financial reporting under Section 404(b) of the Sarbanes-Oxley Act (15 U.S.C. 7262(b)) by the registered public accounting firm that prepared or issued its audit report. þ

If securities are registered pursuant to Section 12(b) of the Act, indicate by check mark whether the financial statements of the registrant included in the filing reflect the correction of an error to previously issued financial statements. o

Indicate by check mark whether any of those error corrections are restatements that required a recovery analysis of incentive-based compensation received by any of the registrant's executive officers during the relevant recovery period pursuant to §240.10D-1(b). o

Indicate by check mark whether the registrant is a shell company (as defined in Rule 12b-2 of the Exchange Act).

Yes o No þ

The aggregate market value of the voting and non-voting common equity held by non-affiliates of the registrant as of June 30, 2024 was approximately $521 million.

Number of shares outstanding by each class of common stock, as of December 31, 2024: Common Stock, $0.01 par value 53,157,964 shares outstanding

DOCUMENTS INCORPORATED BY REFERENCE

Portions of the registrant’s definitive proxy statement relating to the 2025 Annual Meeting of Stockholders are incorporated herein by references in Part III of this Annual Report on Form 10-K to the extent stated herein. Such proxy statement will be filed with the Securities and Exchange Commission within 120 days of the registrant’s fiscal year ended December 31, 2024.

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TABLE OF CONTENTS

PART I
Item 1.	Business	9
Item 1A.	Risk Factors	22
Item 1B.	Unresolved Staff Comments	46
Item 1C.	Cybersecurity	46
Item 2.	Properties	48
Item 3.	Legal Proceedings	49
Item 4.	Mine Safety Disclosures	49
PART II
Item 5.	Market for Registrant’s Common Equity, Related Stockholder Matters and Issuer Purchases of Equity Securities	49
Item 6.	[Reserved]	51
Item 7.	Management’s Discussion and Analysis of Financial Condition and Results of Operations	51
Item 7A.	Quantitative and Qualitative Disclosures About Market Risk	69
Item 8.	Financial Statements and Supplementary Data	71
Item 9.	Changes in and Disagreements with Accountants on Accounting and Financial Disclosure	114
Item 9A.	Controls and Procedures	114
Item 9B.	Other Information	115
Item 9C.	Disclosure Regarding Foreign Jurisdictions that Prevent Inspections	115
PART III
Item 10.	Directors, Executive Officers and Corporate Governance	115
Item 11.	Executive Compensation	115
Item 12.	Security Ownership of Certain Beneficial Owners and Management and Related Stockholder Matters	115
Item 13.	Certain Relationships and Related Transactions and Director Independence	115
Item 14.	Principal Accountant Fees and Services	115
PART IV
Item 15.	Exhibits and Financial Statement Schedules	116
Item 16.	Form 10-K Summary	122
	Signatures	123

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GLOSSARY OF TERMS

Set forth below is a glossary of certain terms used in this annual report on Form 10-K (this “Annual Report”):

“Acquisition Date” means April 11, 2018, the date that certain investment funds managed by affiliates of Apollo Global Management, Inc. and its subsidiaries (the “Apollo Funds”) acquired Sun Country, Inc.

“Adjusted CASM” means CASM excluding fuel costs, non-cash management stock compensation expense, costs arising from our Cargo operations, depreciation and amortization recognized on certain assets that generate lease income, certain commissions, and other costs of selling our vacations product.

“Aircraft miles” means miles flown by all of our aircraft, measured by summing up the miles for each completed flight segment.

“Air traffic liability” means the value of tickets sold in advance of travel.

“ALPA” means the Air Line Pilots Association, the union representing our pilots.

“Amazon” means Amazon.com Services, LLC, together with its affiliates.

"AMFA" means Aircraft Mechanics Fraternal Organization, the union representing our technicians and related craft employees.

“Ancillary revenue” consists primarily of revenue generated from air travel-related services such as baggage fees, seat selection and upgrade fees, priority check-in and boarding fees, other fees and on-board sales.

“Ancillary services” refers to the services that generate ancillary revenue.

“Apollo” means Apollo Global Management, Inc. and its subsidiaries.

“SCA Horus Stockholder” means SCA Horus Holdings, LLC, which is an affiliate of certain investment funds managed by affiliates of Apollo.

"ASAP" means Aviation Safety Action Program.

"ASU" means accounting standard update.

“ATSA” means the Air Transportation Services Agreement, dated as of December 13, 2019, as amended as of June 30, 2020, by and between Sun Country, Inc. and Amazon.

"A&R ATSA" means the Amended and Restated Air Transportation Services Agreement, dated as of June 18, 2024, by and between Sun Country, Inc. and Amazon which was signed in June 2024.

“Available seat miles” or “ASMs” means the number of seats available for passengers multiplied by the number of miles the seats are flown.

“Average aircraft” means the average number of aircraft used in flight operations, as calculated on a monthly basis.

“Average daily aircraft utilization” means block hours divided by number of days in the period divided by average aircraft.

“Average stage length” means the average number of statute miles flown per flight segment.

“Block hours” means the number of hours during which the aircraft is in revenue service, measured from the time of gate departure before take-off until the time of gate arrival at the destination.

"CARES Act" means Coronavirus Aid, Relief, and Economic Security Act.

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“Cargo service” includes our CMI service operations under the A&R ATSA.

“CASM” or “unit costs” is Cost per Available Seat Mile and is calculated using total operating expenses divided by total ASMs.

“CBA” means a collective bargaining agreement.

“CBP” means the United States Customs and Border Protection.

“Charter” means flights operated for specific customers who purchase the entire flight from us and specify the origination and destination.

"CIO" means Chief Information Officer.

"CISO" means Chief Information Security Officer.

“CMI service” means an arrangement whereby a cargo customer provides us with aircraft, pursuant to a sublease, and we provide crew, maintenance, and insurance to operate such aircraft on the customer’s behalf. Amazon is currently our only CMI service customer.

"CODM" means Chief Operating Decision Maker.

“Completion factor” means the percentage of scheduled flights that are completed.

"CO2" means carbon dioxide.

“CORSIA” means Carbon Offsetting and Reduction Scheme for International Aviation.

"COSO" means Committee of Sponsoring Organizations of the Treadway Commission.

“COVID-19” means the novel coronavirus (SARS-CoV-2), which was first reported in December 2019.

"Credit Agreement" means the five-year credit agreement executed on February 10, 2021.

"DDTL" means the Delayed Draw Term Loan Facility.

“DoD” means the U.S. Department of Defense.

“DOT” means the United States Department of Transportation.

"DTC" means Depository Trust Company.

“EPA” means the United States Environmental Protection Agency.

“ESG” means environmental, social and governance.

"EWR" means Newark International Airport.

“Exchange Act” means the Securities Exchange Act of 1934, as amended.

“FAA” means the United States Federal Aviation Administration.

"FASB" means Financial Accounting Standards Board.

“FCPA” means the Foreign Corrupt Practices Act.

“Freighters” include the aircraft operated under the A&R ATSA, which are configured exclusively for Cargo operations.

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"GAAP" means Generally Accepted Accounting Principles.

“GDS” means a Global Distribution System, such as Amadeus, Sabre and Travelport, used by travel agencies and corporations to purchase tickets on participating airlines.

“GHG” means greenhouse gasses.

“IBT” means the International Brotherhood of Teamsters, the union representing our flight attendants.

"ICAO" means the International Civil Aviation Organization.

"IPO" means the Initial Public Offering.

"JFK" means John F. Kennedy International Airport.

"LAX" means Los Angeles International Airport.

“LCC” means low-cost carrier and includes JetBlue Airways, Southwest Airlines, and Alaska Airlines.

"Legacy Network Airlines" includes Delta Airlines, American Airlines, and United Airlines.

“Load factor” means the percentage of aircraft seat miles actually occupied on a flight (RPMs divided by ASMs) for Scheduled Service.

"LTV" means Loan-to-Value.

"MLS" means Major League Soccer.

“MSP” means Minneapolis – St. Paul International Airport.

"Nasdaq" means Nasdaq Global Select Market.

“NCAA” means the National Collegiate Athletic Association.

“NMB” means the National Mediation Board.

"NOLs" means net operating losses.

"NYSE" means New York Stock Exchange.

“OFAC” means the Office of Foreign Assets Control.

“On-Time Arrival” means percentage of scheduled flights that arrived at their scheduled time.

"ORD" means Chicago O'Hare International Airport.

“OTAs” means online travel agents.

"Owned Aircraft Held for Operating Lease" means the Company's Boeing 737-900ERs that are currently on lease to an unaffiliated airline.

“Passengers” means the total number of passengers flown on all flight segments.

"PEB" means the Presidential Emergency Board.

"PRSUs" means Performance-Based Restricted Stock Units.

“Revenue passenger miles” or “RPMs” means the number of miles flown by passengers.

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“RLA” means the United States Railway Labor Act.

"RSUs" mean Time-Based Restricted Stock Units.

"Rule 10b5-1" means Rule 10b5-1 under the Exchange Act.

“Scheduled Service” means transportation of passengers on flights we operate in and out of airports on a schedule of routes and flight times we provide for general sale.

“Scheduled Service Revenue” consists of base fares, unused and expired passenger credits and other expired travel credits for Scheduled Service.

“SCV” means Sun Country Vacations.

“SEC” means the Securities and Exchange Commission.

"SFO" San Francisco International Airport.

"SLA" means Service Level Agreement.

“SMS” means Safety Management System.

“TRA” means the Income Tax Receivable Agreement with pre-IPO stockholders.

“TRASM” or “unit revenue” means total revenue divided by total ASMs. Scheduled Service TRASM includes Scheduled Service revenue, Ancillary revenue, and ASM generating revenue classified within Other Revenue on the Consolidated Statement of Operations divided by Scheduled Service ASMs.

“TSA” means the United States Transportation Security Administration.

“TWU” means the Transport Workers Union, the union representing our dispatchers.

“ULCC” means ultra low-cost carrier and includes Allegiant Travel Company, Frontier Airlines and Spirit Airlines.

"U.S. Citizens" means (A) an individual who is a citizen of the United States; (B) a partnership each of whose partners is an individual who is a citizen of the United States; or (C) a corporation or association organized under the laws of the United States or a State, the District of Columbia, or a territory or possession of the United States, of which the president and at least two-thirds of the board of directors and other managing officers are citizens of the United States, which is under the actual control of citizens of the United States, and in which at least 75% of the voting interest is owned and controlled by persons that are citizens of the United States.

“VFR” means visiting friends and relatives.

"VIEs" means variable interest entities.

"VIP" means Very Important Person.

"2019-1 EETC" means the issuance of Class A, Class B and Class C trust certificates Series 2019-1.

"2022-1 EETC" means the issuance of Class A and Class B trust certificates Series 2022-1.

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CAUTIONARY NOTE REGARDING FORWARD-LOOKING STATEMENTS

This Annual Report contains “forward-looking statements” within the meaning of the U.S. Private Securities Litigation Reform Act of 1995, which involve risks and uncertainties. These forward-looking statements are generally identified by the use of forward-looking terminology, including the terms “anticipate,” “believe,” “continue,” “could,” “estimate,” “expect,” “intend,” “likely,” “may,” “plan,” “possible,” “potential,” “predict,” “project,” “should,” “target,” “will,” “would” and, in each case, their negative or other various or comparable terminology. All statements other than statements of historical facts contained in this Annual Report, including statements regarding our strategy, future operations, future financial position, future revenue, projected costs, prospects, plans, objectives of management, and expected market growth are forward-looking statements. The forward-looking statements are contained principally in the sections entitled “Business,” “Risk Factors” and “Management’s Discussion and Analysis of Financial Condition and Results of Operations”.

These statements are based on assumptions and involve known and unknown risks, uncertainties and other important factors that may cause our actual results, performance, or achievements to be materially different from any future results, performance, or achievements expressed or implied by the forward-looking statements. Important factors that could cause our results to vary from expectations include, but are not limited to, the items discussed under “Risk Factors” in this Annual Report. Given these uncertainties, undue reliance should not be placed on these forward-looking statements. Except as required by law, we undertake no obligation to update or revise publicly any forward-looking statements, whether as a result of new information, future events or otherwise. We anticipate that subsequent events and developments will cause our views to change. This Annual Report and the documents filed as exhibits hereto should be read completely and with the understanding that our actual future results may be materially different from what we expect. Our forward-looking statements do not reflect the potential impact of any future acquisitions, merger, dispositions, joint ventures, or investments we may undertake. We qualify all our forward-looking statements by these cautionary statements.

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SUMMARY OF PRINCIPAL RISK FACTORS

Our business is subject to a number of risks and uncertainties that may affect our business, results of operations and financial condition, or the trading price of our common stock or other securities. We caution the reader that these risk factors may not be exhaustive. We operate in a continually changing business environment, and new risks and uncertainties emerge from time to time. Management cannot predict such new risks and uncertainties, nor can it assess the extent to which any of the risk factors below or any such new risks and uncertainties, or any combination thereof, may impact our business. These risks are more fully described in Part I, Item 1A of this Annual Report.

–Changes in economic conditions, including inflationary pressures.

–The price and availability of aircraft fuel and our ability to control other costs.

–Our reliance on our and third-party technology and systems.

–The ability to operate in an exceedingly competitive industry.

–Factors beyond our control, including air traffic congestion, adverse weather, federal government shutdowns, aircraft-type groundings, threatened or actual terrorist attacks, war or security concerns resulting in increased security measures or outbreaks or rapid spread of disease.

–Any restrictions on or increased taxes applicable to charges for ancillary products and services.

–The concentration of our business in the Minneapolis-St. Paul market and the concentration of our Cargo business with Amazon.

–Risks associated with our presence in international markets.

–Changes in applicable laws and regulations, including regulation to reduce emissions of greenhouse gases.

–Risks associated with the loss of key personnel, increased labor costs, union disputes, employee strikes and other labor-related disruptions.

–Labor shortages and our ability to attract and retain qualified personnel, including but not limited to, pilots and technicians, at a reasonable cost or maintain our company culture.

–Increases in insurance costs or reductions in insurance coverage.

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Unless otherwise indicated or the context otherwise requires, all dollars are stated in thousands within this Annual Report.

PART I

ITEM 1. BUSINESS

Overview

Sun Country Airlines is a new breed of hybrid low-cost air carrier that dynamically deploys shared resources across our synergistic Scheduled Service, Charter, and Cargo businesses. By doing so, we generate high growth, high margins and strong cash flows with greater resilience than other passenger airlines. Based in Minnesota, we focus on serving leisure and VFR passengers, Charter customers, and providing CMI service to Amazon, with flights throughout the United States and to destinations in Canada, Mexico, Central America and the Caribbean. We share resources, such as flight crews, across our Scheduled Service, Charter and Cargo business lines with the objective of generating high returns and margins and mitigating the seasonality of our route network. We optimize capacity using an agile peak demand scheduling strategy which aims to shift flying to markets during periods of peak demand and away from markets during periods of low demand. This allows us to produce higher unit revenue with a competitive low-cost structure, in line with other ULCCs, resulting in best-in-class unit profitability, while also providing greater resiliency to economic or industry downturns. This strategy has been implemented and executed by an experienced management team with deep knowledge of the industry.

We flex our capacity by day of the week, time of year and line of business to capture what we believe are the most profitable, peak demand, flying opportunities available from both our MSP home market and our network of non-MSP markets. In addition to these network shifts, we also shift aircraft between our Scheduled Service and Charter businesses to maximize the return on our assets. We regularly schedule our fleet using what we refer to as “Power Patterns”, which involves scheduling aircraft and crew on trips that combine Scheduled Service and Charter legs, dynamically replacing what would be lower margin Scheduled Service flights with Charter opportunities. Our agility is supported by our variable cost structure and the cross utilization of our people and assets between our lines of business. Our synergies from cross-utilization have increased since we began providing CMI services because our pilots are interchangeably deployed between Scheduled Service, Charter and Cargo flights.

We have invested in numerous projects to create a well-regarded product and brand that we believe is superior to ULCCs while maintaining lower fares than LCCs and larger full-service carriers. We believe that our cabin experience is a differentiator amongst ULCCs. All of our aircraft have new state-of-the-art seats that comfortably recline and have full size tray tables. Our seats have an average pitch of approximately 31 inches, giving our customers comparable legroom to Southwest Airlines and greater legroom than all ULCCs in the United States. We also provide seat-back power, complimentary in-flight entertainment and free beverages to improve the overall flying experience for our customers.

Our Fleet

We fly a single-family fleet of mid-life Boeing 737-NG aircraft, which allows us to maintain a cost base comparable to ULCCs. Flying mid-life Boeing 737-NG aircraft allows us to maintain low aircraft ownership costs and have lower acquisition costs when compared to new Boeing 737 aircraft, both of which more than offset their higher ongoing maintenance and repair costs. Lower ownership costs allow us to maintain lower unit costs at lower levels of utilization. This allows us to concentrate our Scheduled Service flying during periods of peak demand, and also allows us to park aircraft during periods of low demand at a lower cost than other airlines.

In addition to the benefits of lower all-in ownership costs, we do not have an aircraft order book because we only purchase mid-life aircraft. As a result, unlike many other airlines, we are not locked into large future capital expenditures. Rather, we have the ability to opportunistically take advantage of aircraft prices with purchases at the time of our choosing. Our single-family aircraft fleet also has operational and cost advantages, such as allowing for optimization of crew scheduling and training and lower maintenance costs. Our fleet is reliable, and we have demonstrated the ability to maintain our high completion factor during harsh weather conditions. For

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more information on our operational performance and comparisons to our competitors, see "Operational Performance" included within Part I, Item 1, "Business".

As of December 31, 2024, our fleet consisted of 63 Boeing 737-NG aircraft. This includes 45 aircraft in the passenger fleet, 12 cargo operated aircraft through the A&R ATSA with Amazon, and six aircraft that are currently on lease to unaffiliated airlines. Our fleet is managed through our two reportable segments: Passenger, which is comprised of Scheduled Service and Charter, and Cargo. The 12 cargo aircraft are subleased directly from Amazon and we operate them pursuant to the A&R ATSA. The six aircraft that are currently on lease to unaffiliated airlines are expected to be inducted into our passenger fleet upon lease expiry. As of December 31, 2024, the leases expire at various dates through the fourth quarter of 2025. In January 2025, amendments were executed to extend the lease expiry terms for three of the six aircraft that are currently on lease to unaffiliated airlines. As of the date of this filing, the leases expire over various dates through the fourth quarter of 2026.

During 2024, the Company entered into the A&R ATSA with Amazon that will increase the number of Boeing 737-800 cargo aircraft that we operate on behalf of Amazon from 12 to 20 in 2025. The first additional aircraft was received in January 2025 and is expected to begin service in the first quarter of 2025. All eight additional aircraft are expected to be operational by the end of the third quarter of 2025. For more information on the A&R ATSA, see the "Cargo" discussion included within Part I, Item 1, "Business".

Our Unique Business Model

Scheduled Service. Our Scheduled Service business combines low costs with a high-quality product to generate higher TRASM than ULCCs while maintaining lower Adjusted CASM than LCCs, resulting in best-in-class unit profitability. We offer a high-quality product that we believe is superior to ULCCs and consistent with that of LCCs. Our product includes non-stop flights to popular destinations, generous legroom, complimentary beverages, in-flight entertainment, and in-seat power. For the years ended December 31, 2024 and 2023, we flew 4.5 million and 4.1 million Scheduled Service passengers, respectively. For the years ended December 31, 2024 and 2023, our average total fare per passenger was approximately $159.93 and $176.30, respectively.

We provide low-fare passenger airline service primarily to leisure and VFR travelers. Our low fares are designed to stimulate demand from price-sensitive travelers seeking a superior product to ULCCs. We operate our Scheduled Service business using a flexible capacity model focused on peak demand. Our flexible business model provides greater resiliency to economic and industry downturns than a traditional Scheduled Service carrier. Our flying continued to be seasonal in 2024, as only 3% of our total Scheduled Service routes were daily, year-round routes to three locations. The following charts demonstrate the variability in our Scheduled Service flying by day of the week and time of year.

Seasonal Demand Dictates Monthly Scheduled Service Schedule	Day-of-Week Capacity Determined by Scheduled Service Demand Patterns (1)
Monthly Seats as a % of March 2024 Seats	(% of Peak Day ASMs)	(TRASM in cents)

(1)	Based on fiscal year 2024 data

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Our Scheduled Service business includes many cost characteristics of ULCCs, such as an unbundled product (which means we offer a low base fare and allow customers to purchase ancillary products and services for an additional fee), and point-to-point service. Sources of our ancillary revenue include air travel-related services such as baggage fees, seat selection and upgrade fees, priority check-in and boarding fees, other fees and on-board sales. Part of our strategy is to reduce base fares to stimulate demand while increasing ancillary revenue per passenger, which we believe offers passengers more choice and generates more ancillary revenue. Our on-board sales are also designed to enhance the customer experience, including local passenger favorite brands of beer, wine and spirits. For the years ended December 31, 2024 and 2023, our average ancillary revenue per passenger was approximately $68.68 and $66.69, respectively.

We also earn revenue from our SCV products, including commissions from the sale of third-party hotel rooms and rental cars. Our SCV products facilitate booking a flight and land package at a discounted price for our customers. We offer vacation products to promote “one stop shopping.” Our Other Revenue also includes revenue from our co-branded credit card and rental revenue related to certain transactions where the Company serves as a lessor.

2024 Scheduled Service Route Map

Scheduled Service Route Network. As Minnesota’s hometown airline, a substantial portion of our business is serving markets originating or ending in MSP. We fly out of Terminal 2 at MSP, which we believe is preferred by many flyers because of its smaller layout, shorter security wait times, close parking relative to check-in and full suite of retail shops. As of December 31, 2024, we have access to eight of the 14 gates in Terminal 2 and use of additional gates as needed.

We have been based in the Minneapolis-St. Paul area since our founding over 40 years ago, where our brand is well-known and well-respected. We are the largest low-cost airline operating at MSP, which is our largest base, and the second largest airline at MSP after Delta Air Lines. We have been focused on developing our network at MSP. Since 2019, we have doubled our non-stop destinations from MSP. Our MSP network served approximately 104 markets in 2024. As a result of our focus on flying during seasonal peak periods, our well-respected brand and product, and our strong position in Minneapolis, we have historically enjoyed a TRASM premium to other leisure airlines at MSP.

Our peak demand strategy focuses on profitable flying opportunities available from both our MSP home market and our network of non-MSP markets. As a result, our route network varies widely throughout the year. We have a successful history of opening and closing stations to meet seasonal demand and we expect to continue to identify high demand markets where other airlines have been unable to respond to market needs during periods of seasonal demand. Since the start of 2024, we have launched 16 new markets. Non-MSP service is an increasingly significant portion of our business, comprising 14% of all the markets served in 2024.

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As part of the ongoing assessment of market opportunities, we continue to identify future growth opportunities, primarily to warm weather leisure destinations and large markets with fragmented and seasonal demand peaks.

MSP Departures	Top 5 Destinations from MSP in....
(# of Departures)

March 2024
Orlando, Florida	42%
Cancun, Mexico
Fort Meyers, Florida
Phoenix, Arizona	of Departures
Tampa, Florida
July 2024
Los Angeles, California	25%
San Francisco, California
Seattle, Washington
Las Vegas, Nevada	of Departures
Orlando, Florida

Charter. Our Charter business, which is one of the largest narrow body Charter operations in the United States, is a key component of our strategy, both because it provides inherent diversification and downside demand protection, and because it is synergistic with our other businesses. This allows for the most profitable use of the aircraft to be selected at any point in time. Our Charter business has several favorable characteristics, including large repeat customers, and the ability to pass through certain costs, including fuel. Our air carrier operating certificate, labor agreements and operating capabilities allow us to fly to numerous destinations, permitting us to enter into a variety of Charter contracts.

Our Charter business includes ad hoc, short-term and long-term service contracts with pass-through fuel arrangements and annual rate escalations. Our diverse Charter customer base includes, but is not limited to the DoD, collegiate and professional sports teams and casinos. In October 2021, we signed a five-year agreement to provide Charter service to all MLS teams. MLS will feature 30 clubs throughout the United States and Canada during the 2025 season, and may have future expansion teams in later seasons. We are a leading Charter airline for collegiate sports including the NCAA Championships, as well as individual team travel. Most of our contracts are non-cyclical because the DoD and sports teams still fly during normal economic downturns, and our casino contracts are long-term in nature. We also operate regularly scheduled VIP Charter services to certain specified locations with continuous service and an aircraft outfitted with an all first-class configuration. For the years ended December 31, 2024 and 2023, Charter block hours under long-term contracts comprised 74% and 80% of total Charter flying, respectively.

Cargo. We are currently flying 12 Boeing 737-800 cargo aircraft for Amazon. All aircraft in our Cargo service are subleased directly from Amazon, serve destinations in Amazon's network and are operated pursuant to the A&R ATSA. Our Cargo business also enables us to leverage certain assets, capabilities and fixed costs to enhance profitability and promote growth across our Company. For example, we believe that by deploying pilots across each of our business lines, we increase the efficiency of our operations. To the extent we can optimize flight crew on cargo aircraft with overlapping Scheduled Service or Charter flights, we attempt to capture those synergies as well, though they are not core to that line of business. However, like the Charter and Scheduled

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Service business, aircraft and crew utilization can be optimized by filling in Cargo service in periods when Scheduled Service and Charter flying is less profitable.

During 2024, the Company entered into the A&R ATSA with Amazon that will increase the number of Boeing 737-800 cargo aircraft that we operate on behalf of Amazon from 12 to 20 in 2025. The A&R ATSA includes revised economics to reflect the higher-cost environment that has ensued since the original ATSA was signed in December 2019. The first additional aircraft was received in January 2025 and is expected to begin service in the first quarter of 2025. All eight additional aircraft are expected to be operational by the end of the third quarter of 2025. The A&R ATSA includes an initial six-year term, which expires in October 2030. The agreement includes two additional, two-year renewal terms exercisable at Amazon's option, and a subsequent three-year renewal term subject to mutual written agreement, which, if not agreed to, will trigger a final two-year wind-down term.

Our CMI service is asset-light, as Amazon supplies the aircraft and covers many of the operating expenses, including fuel, and provides all cargo loading and unloading services. We are responsible for flying the aircraft under our air carrier certificate, crew, aircraft line maintenance and insurance, all of which allow us to leverage our existing operational expertise from our Scheduled Service and Charter lines of business.

Competition

The airline industry is highly competitive. The principal competitive factors in the airline industry are ticket prices, flight schedules, passenger amenities, customer service, reputation and loyalty programs. We have different competitive sets in our Scheduled Service and Charter lines of business, and our Cargo business.

Our competitors and potential competitors in the Scheduled Service business include both legacy network airlines and low-cost airlines. Our key competitors on domestic routes include Alaska Airlines, Allegiant Travel Company, American Airlines, Delta Air Lines, Frontier Airlines, JetBlue Airways, Southwest Airlines, Spirit Airlines and United Airlines. Our Charter business competitors include charter-only operators, as well as other scheduled passenger carriers who also operate charter flying, such as Delta Air Lines. ATSG and Alaska Airlines (acquired through the Hawaiian Airlines transaction) also perform US domestic flying for Amazon utilizing widebody aircraft while Sun Country and Atlas operate narrowbody 737-800 freighters for Amazon. The performance of our Cargo line of business is strong and reliable which gives us a stable position with our customer, Amazon. Our strong relationship with Amazon is evidenced by the most recent A&R ATSA which will increase the number aircraft operated on behalf of Amazon from 12 to 20, making us the sole operator of Amazon 737-800 freighters in their US domestic network.

Our principal competitive advantages include our: diversified and resilient business model, agile peak demand scheduling strategy, tactical mid-life fleet with flexible operations, superior low-cost product and brand, competitive low-cost structure, strong position in our profitable MSP home market and our seasoned management team.

The majority of our competitors maintain higher utilization to keep their unit costs low, which makes it difficult for them to serve markets on a highly seasonal or day-of-week basis. Our ability to maintain low unit costs at low utilization provides us with a competitive advantage to execute our agile peak demand network planning structure. Our peak demand strategy allows us to move into new markets quickly during periods when demand is maximized and there is less competitive pricing pressure.

See also “Risk Factors - Risks Related to Our Industry - The airline industry is exceedingly competitive, and we compete against new entrants, LCCs, ULCCs, legacy network airlines and cargo carriers, as well as air travel substitutes; if we are not able to compete successfully in our markets, our business will be materially adversely affected.”

Seasonality

The airline industry has significant seasonal fluctuation in leisure demand. Our network strategy is designed to take advantage of the seasonal nature of the leisure customer's needs by concentrating our flying in seasons when demand is strongest and flying significantly less in seasons when demand is lower. As a result, our passenger business is subject to significant seasonal fluctuations, especially our Scheduled Service. We grow

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and obtain new opportunities for our Charter service when Scheduled Service demand is reduced. While our passenger business will remain highly seasonal, our Cargo operations will have the effect of mitigating seasonal troughs. For example, when our scheduled flying demand is lower during the fall and early December, we fly Charter contracts such as our contracts for collegiate sports. Our Cargo service remains consistent and grows until Christmas.

Traditionally, our business is geared towards north to south travel from MSP and the upper Midwest in the winter months, our strongest travel season. During the summer months, we focus on VFR traffic from MSP and leisure travelers originating in non-MSP markets. Although our actual results vary by season, we pride ourselves on the ability to adjust our route network and Charter service to accommodate seasonality.

Distribution

We sell our Scheduled Service flights through direct and indirect distribution channels with the goal of selling in the most efficient way across our customer base. Our direct distribution channels include our website, mobile app and call center, and indirect distribution channels include third parties, such as travel agents and OTAs (e.g., Priceline and Expedia).

Our direct distribution channels are our lowest cost methods of distributing our product. In addition, they provide more opportunities to sell ancillary products and services, such as baggage fees, seat selection and upgrade fees, priority check-in and boarding fees, and other fees. With our Navitaire-based reservation system, enhanced website, and mobile app, we sell a large proportion of our bookings through direct channels. Sales through direct channels for both years ended December 31, 2024 and 2023 were 78%.

Indirect distribution channels remain important outlets to sell our flights. Our movement in and out of markets where we may not have an established brand presence, is facilitated by the availability of our inventory through GDS companies (e.g., Amadeus, Sabre and Travelport). We also generate sales through OTAs, which also broadens our ability to sell in highly seasonal markets. Sales through these relatively higher cost indirect channels for both years ended December 31, 2024 and 2023 were 22%.

We sell our Charter services through an internal, dedicated sales team that is focused on long-term relationships with key customers, brokers, organizations, and college and professional sports teams. While our CMI service is presently dedicated to Amazon and governed by the A&R ATSA, we may expand our Cargo business by marketing to new potential customers.

Marketing

We are focused on direct-to-consumer marketing targeted at our core leisure and VFR travelers who pay for their own travel costs. Our marketing message is designed to convey our affordable and convenient flight options to leisure destinations. We often include our low base fares in marketing materials to stimulate demand.

Our marketing tools are our proprietary email distribution list consisting of approximately two million email addresses, our Sun Country Rewards program, as well as advertisements online, on television, radio, digital billboards and other channels. Our objective is to use our low prices, quality customer service, and differentiated in-flight product to stimulate demand and drive customer loyalty.

We have a team of business development professionals who utilize business-to-business methods to identify opportunities and develop and maintain relationships with potential Charter customers. We do not presently market our Cargo business.

Loyalty Program

Our Sun Country Rewards loyalty program rewards and encourages Scheduled Service customer loyalty and we believe it is well tailored to serving the leisure passenger. Points earned are treated like currency and can be applied towards the purchase price of all or a portion of our air travel tickets and ancillary products. This makes our program more valuable to leisure customers who travel less frequently and would have difficultly accumulating enough points to get discounted travel on other airlines. The Sun Country Airlines co-branded credit card is the primary vehicle for our customers to earn points and our loyalty program is geared specifically

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towards supporting adoption and continued use of the credit card. Sun Country Rewards offers award travel on every flight without blackout dates. Points expire 36 months after the date they were earned, except those points held by Sun Country co-branded credit cardholders do not expire so long as the holder maintains the card as active.

Operational Performance

We are committed to delivering excellent operational performance, even in extreme weather conditions, which we believe supports our “peak demand,” leisure-focused business model and will strengthen customer loyalty and attract new customers. This focus also strengthens our relationship with our cargo customer, Amazon, who has incentives and disincentives for performance in the A&R ATSA. Our operational performance is enabled by our capable and dedicated workforce in maintenance, ground, flight crew and system operations, as well as our highly capable fleet of Boeing 737-NG aircraft, which are equipped to operate in adverse weather conditions. Our primary operational metric is completion factor because most of our markets are operated less than daily. Our Scheduled Service completion factor, including the adverse impact of weather, was 98.7% and 99.0% for the years ended December 31, 2024 and 2023, respectively.

Aircraft Fuel

Aircraft fuel is one of our largest individual expenses, representing approximately 24% and 27% of our total operating costs for the years ended December 31, 2024 and 2023, respectively. The price and availability of jet fuel are volatile due to global economic and geopolitical factors as well as domestic and local supply factors. Our historical fuel consumption and costs were as follows:

	Year Ended December 31,
	2024		2023
Fuel Gallons Consumed (in thousands)	86,185		79,574
Fuel cost per gallon, excluding indirect fuel credits	$	2.77	$	3.11

Gallons consumed includes Scheduled Service and some Charter operations where we are responsible for fuel and are later reimbursed by the customer, but does not include Cargo. In general, our Charter operations and the A&R ATSA have pass-through provisions for fuel costs. Under our Charter agreements, we are either responsible for arranging for fuel on behalf of the customer (agent), or we are directly responsible for providing fuel (principal). The fuel costs under both Charter arrangements are reimbursed by the customer. When we are acting as an agent for the Customer, reimbursable fuel costs are recorded net of the revenue recognized. For those reasons, they are not included in the measure above. In Charter arrangements where we are the principal, the reimbursed fuel costs are recognized as revenue and the fuel costs are recognized in Aircraft Fuel Expense on the Statement of Operations. These amounts are reflected in the measure above.

Average price per gallon includes related fuel fees and taxes, as well as indirect fuel credits that are recognized within Aircraft Fuel expense, but are not directly related to our Fuel Cost per Gallon.

Our low-cost business model demands that we consistently look for ways to reduce the amount of jet fuel we consume. These jet fuel reduction initiatives include the following:

•Efficient seating - we optimize the number of seats on our plane, making each flight as fuel efficient as possible.

•Focus on demand - we understand our customers travel needs and patterns. We conserve fuel by limiting ferry flights and flying only when and where demand exists.

•On-the-ground tactics - our commitment to fuel efficiency includes tactical on-ground procedures, such as only using one engine to taxi around the airport and utilizing super tugs to position aircraft, which allows us to reduce fuel consumption.

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Technical Operations: Maintenance, Repairs and Overhaul

We have an FAA mandated and approved maintenance program, which is administered by an experienced group of Technical Operations leaders. All our technicians are licensed for both Airframe and Powerplant and undergo extensive initial and recurrent training. Aircraft maintenance and repair consists of routine and non-routine maintenance. Work performed is divided into three general categories: line maintenance, heavy maintenance, and component maintenance.

Line maintenance work is handled by our employees and maintenance contractors and consists of work performed between flights or overnight. Performing effective line maintenance is critical in maintaining reliable operations and represents the majority of and most extensive maintenance we perform. Line maintenance consists of routine daily and weekly scheduled maintenance checks and unplanned maintenance on our aircraft. We maintain Sun Country technicians in Minneapolis, with limited line maintenance capabilities in Gulfport, Mississippi, Dallas-Fort Worth/Alliance Fort Worth, Texas, Lakeland Linder Airport, Florida, Laughlin/Bullhead International Airport, Arizona, Fort Meyers, Florida and Reno, Nevada. All other line maintenance is provided by third-party maintenance contractors, as needed.

Heavy maintenance consists of engine, auxiliary power units, landing gear, and airframe overhauls, some of which are quite extensive and can take several months to complete. We maintain an inventory of spare engines to provide for continued operations during engine maintenance events. Airframe heavy maintenance visits consist of a series of complex tasks that generally take from one to six weeks to accomplish and are performed on a set schedule with varying repeat intervals. Due to our relatively small fleet size and projected fleet growth, we believe outsourcing all of our heavy maintenance, engine restoration and major part repair is more economical. On our cargo aircraft, heavy maintenance is a pass-through expense to our customer, Amazon.

We outsource component maintenance. Component maintenance consists of the ongoing and routine maintenance of aircraft components that are line replaceable units. These contracts cover the majority of our aircraft component inventory acquisition, replacement and repairs, thereby reducing the need to carry extensive spare parts inventory.

Human Capital

As of December 31, 2024, we had 3,141 employees.

FAA regulations require pilots to have commercial licenses with specific ratings for the aircraft to be flown and to be medically certified as physically fit to fly. FAA and medical certifications are subject to periodic renewal requirements including recurrent training and recent flying experience. Technicians, quality-control inspectors and flight dispatchers must be certificated and qualified for specific aircraft. Flight attendants must have initial and periodic competency training and qualification. Training programs are subject to approval and monitoring by the FAA. Management personnel directly involved in the supervision of flight operations, training, maintenance and aircraft inspection must also meet experience standards prescribed by FAA regulations.

As of December 31, 2024, approximately 60% of our employees were represented by labor unions as set forth in the table below. AMFA organized our technicians in 2022 and negotiations for an initial CBA with our technicians and related craft employees began in October of 2022 and negotiations are ongoing with the assistance of a federal mediator appointed by the NMB. IBT organized our below-the-wing employees in 2023 and negotiations began in March of 2023 and are ongoing. Our CBA with our pilots is amendable on December 21, 2025. Our CBA with our flight attendants became amendable on December 31, 2019. We entered into negotiations in November 2019. Negotiations were paused by mutual consent in March 2020 due to the COVID-19 pandemic. We restarted negotiations with our flight attendants in October of 2021 and in July of 2023, we and IBT jointly requested the appointment of a mediator through the NMB. The parties began NMB mediated negotiations in December of 2023. The parties reached a tentative agreement in February 2025 and the ratification vote is expected to occur in the first quarter of 2025. Our CBA with our dispatchers became amendable on November 30, 2024. Negotiations began in June 2024. The parties reached a tentative agreement in January 2025 and the ratification vote is expected to occur in the first quarter of 2025.

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As of December 31, 2024, the status of the CBAs for our employees was as follows:

Employee Group	Number of<br><br>Employees	Representative	Status of <br>Agreement/Amendable Date
Pilots	662	ALPA	Amendable in December 2025
Flight Attendants	756	IBT	Currently amendable (commenced as of December 2019)(1)
Dispatchers	34	TWU	Currently amendable (commenced as of November 2024)(2)
Technicians and related craft employees	197	AMFA	Contract in negotiations
Below the Wing Fleet Service Employees	237	IBT	Contract in negotiations
(1) In February 2025, we reached a tentative agreement with our flight attendants. The ratification vote is expected to occur in the first quarter of 2025.
(2) In January 2025, we reached a tentative agreement with our dispatchers. The ratification vote is expected to occur in the first quarter of 2025.

The RLA governs our relations with labor organizations. Under the RLA, the CBA's generally do not expire, but instead become amendable as of a stated date. If either party wishes to modify the terms of any such agreement, they must notify the other party in the manner agreed to by the parties. Under the RLA, after receipt of such notice, the parties must meet for direct negotiations, and if no agreement is reached, either party may request the NMB to appoint a federal mediator. The RLA prescribes no set timetable for the direct negotiation and mediation process. It is not unusual for those processes to last for many months, and even for a few years. If no agreement is reached in mediation, the NMB in its discretion may declare at some time that an impasse exists, and if an impasse is declared, the NMB proffers binding arbitration to the parties. Either party may decline to submit to arbitration. If arbitration is rejected by either party, a 30-day “cooling off” period commences. During that period (or after), a PEB may be established, which examines the parties’ positions and recommends a solution. The PEB process lasts for 30 days and is followed by another “cooling off” period of 30 days. At the end of a “cooling off” period, unless an agreement is reached or action is taken by Congress, the labor organization may strike and the airline may resort to “self-help,” including the imposition of any or all of its proposed amendments and the hiring of new employees to replace any striking workers. Congress and the President have the authority to prevent a strike and “self-help” by enacting legislation that, among other things, imposes a settlement on the parties.

Safety and Security

Sun Country Airlines prioritizes the safety and security of its employees and customers. We are committed to maintaining the highest level of safety compliance, with all operations guided by procedures and policies.

Ensuring that employees are trained to the proper standards and equipped with the necessary tools and resources to perform their roles safely and efficiently is essential to our operations. We gather employee feedback through annual safety culture surveys to identify improvement areas, which are used to develop corrective action plans.

We also engage in industry best practices by participating in safety-sharing programs with other airlines and using the FAA’s Aviation Safety Information Analysis and Sharing System to exchange critical safety data.

Sun Country invests in safety and security programs, including:

•Flight Operations Quality Assurance, a program designed to collect and analyze flight operations data to identify areas for safety, efficiency, and training improvements.

•Investments in advanced training devices, such as a new cabin simulator, to enhance flight attendant training.

•ProSafeT, an SMS that enables anonymous safety concern reporting and supports hazard identification and mitigation efforts.

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•ASAP, a partnership with the FAA and labor unions to encourage the reporting of safety issues without fear of FAA enforcement.

The information from these safety programs is used to inform management, ensuring the ongoing health and effectiveness of our SMS. Sun Country Airlines is dedicated to fostering a culture of safety and security that meets the highest industry standards.

Community Involvement

At Sun Country, we place tremendous value in our stakeholders, such as our customers, partners, and members of our community. As a fast-growing and dynamic airline, we know our success depends on collaboration with stakeholders, and we strive to engage with stakeholders in our community and more broadly.

We are a longtime partner with Make-A-Wish Minnesota and provide flights for children with critical illnesses to help them safely travel to and from their wish destinations. In 2021, we made a three-year commitment to donate travel to accommodate every Wish Kid traveling anywhere that our airline flies. In 2024, we continued our commitment to donate travel to Make-A-Wish Minnesota by signing a new three-year agreement that automatically renews at the end of the agreement. Each December, our “Flight to the North Pole” helps bring holiday cheer to Wish Kids by “flying” them to the home of Santa Claus.

Sun Country is a proud partner of the DoD, and we take pride in providing Charter service for our nation’s military domestically and abroad. Additionally, Sun Country is proud to help transport military veterans to Washington, D.C. aboard Honor Flights to share in a day of honor at our nation’s memorials. These trips are an important way to commemorate the courage and dedication of our nation’s veterans and provide them a day filled with reflection, support, and thanks. Many of our pilots and other team members are armed forces veterans and we are proud to fly the DoD.

We sponsor the Hennepin Theatre Trust Spotlight Education program. We also support the development of a “workforce of tomorrow” by investing in initiatives like STARBASE STEM and Girls in Aviation, which both serve to educate and create a pipeline for historically disadvantaged students.

Insurance

We maintain insurance policies that are of types customary in the airline industry and as required by the DOT, lessors and other financing parties. The policies principally provide liability coverage for public and passenger injury; damage to property; loss of or damage to flight equipment; fire; auto; directors’ and officers’ liability; advertiser and media liability; cyber risk liability; fiduciary; workers’ compensation and employer’s liability; and war risk (terrorism). We also require our lessees to carry hull all risks, hull war and allied perils, spares all risks (including war and allied perils), and aircraft third party, passenger, baggage, cargo and mail, and airline general third party legal liability insurance.

Foreign Ownership

Under federal law and DOT policy, we must be owned and controlled by U.S. citizens. The restrictions imposed by federal law and DOT policy currently require that at least 75% of our voting stock must be owned and controlled, directly and indirectly, by persons or entities who are U.S. citizens, as that term is defined in 49 U.S.C. §40102(a)(15), that our president and at least two-thirds of the members of our Board of Directors and other managing officers be U.S. citizens, and that we be under the actual control of U.S. citizens. In addition, at least 51% of our total outstanding stock must be owned and controlled by U.S. citizens and no more than 49% of our stock may be owned or controlled, directly or indirectly, by persons or entities who are not U.S. citizens and are from countries that have entered into “open skies” air transport agreements with the United States. We are currently in compliance with these ownership provisions. For a discussion of the procedures we instituted to ensure compliance with these foreign ownership rules, please see “Risk Factors - Risks Related to Ownership of Our Common Stock - Our certificate of incorporation and bylaws include provisions limiting ownership and voting by non-U.S. citizens.”

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Government Regulation

Aviation Regulation

The airline industry is heavily regulated, especially by the federal government. Two of the primary regulatory authorities overseeing air transportation in the United States are the DOT and the FAA.

The DOT regulates economic operating authority for air carriers and consumer protection for airline passengers. The DOT has authority to issue certificates of public convenience and necessity required for airlines to provide domestic air transportation. Additional DOT authority, in the form of a certificate or an exemption from certificate requirements, is required for a U.S. airline to serve foreign destinations either with its own aircraft or via code-sharing with another airline. A U.S. airline’s ability to operate flights to and from international destinations is also subject to the air transport agreements between the United States and the foreign country as well as the airline's ability to obtain the necessary authority from the applicable foreign government.

The U.S. government has negotiated “open skies” agreements with many countries, which allow unrestricted access between the United States and the applicable foreign country and to points beyond the foreign country on flights serving the foreign country. With certain other countries, however, the United States has a restricted air transportation agreement. Our international flights to Mexico are governed by a liberalized bilateral air transport agreement, which the DOT has determined has all the attributes of an “open skies” agreement. Changes in the aviation policies of the United States, Mexico or other countries in which we operate could result in the alteration or termination of the corresponding air transport agreement, diminish the value of our international route authorities or otherwise affect our operations to or from these countries.

The FAA became a part of the DOT in 1967 and is responsible for regulating and overseeing matters relating to the safety of air carrier flight operations, including the control of navigable air space, the qualification of flight personnel, flight training practices, compliance with FAA airline operating certificate requirements, aircraft certification and maintenance requirements and other matters affecting air safety. The FAA requires each commercial airline to obtain and hold an FAA air carrier certificate. We currently hold an FAA air carrier certificate.

Our lessees are also subject to extensive, direct regulation under the laws of the jurisdictions in which they are registered and where they operate. Such laws govern, among other things, the registration, operation, security, and maintenance of our aircraft, environmental issues and the financial oversight of their operations. To the extent that a lessee is not in compliance, we may be required to comply with such requirements, possibly at our own expense.

Airport Access

In the United States, the FAA currently regulates the allocation of take-off and landing authority, slots, slot exemptions, operating authorizations or similar capacity allocation mechanisms, which limit take-offs and landings, at certain airports. Level 1 is assigned where the capacity of airport infrastructure is generally adequate to meet the demands of airport users at all times and therefore there is no extensive pattern of delays. Level 2 is assigned where there is potential for congestion during some periods of the day, week or season, which can be resolved by schedule adjustments mutually agreed between the airlines and schedule facilitator. Level 3 is assigned where, 1) demand for airport infrastructure significantly exceeds the airport’s capacity during the relevant period, 2) expansion of airport infrastructure to meet demand is not possible in the short term, 3) attempts to resolve the problem through voluntary schedule adjustments have failed or are ineffective, and 4) as a result, a process of slot allocation is required whereby it is necessary for all airlines and other aircraft operators to have a slot allocated by a coordinator in order to arrive or depart at the airport during the periods when slot allocation occurs. We have operated in and out of JFK, a Level 3 airport, since April of 2023. We also currently operate in and out of the following Level 2 airports: SFO, LAX, ORD and EWR.

We currently have the access we need to accommodate our planned service, and we have generally been able to obtain the rights to expand our operations and to change our schedules. There is no assurance, however, that we will be able to do so in the future because, among other reasons, such allocations are subject to changes in governmental policies.

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Consumer Protection Regulation

The DOT also has jurisdiction over certain economic issues affecting air transportation and consumer protection matters, including unfair or deceptive practices and unfair methods of competition, lengthy tarmac delays, airline advertising, denied boarding compensation, ticket refunds, baggage liability, contracts of carriage, customer service commitments, consumer notices and disclosures, customer complaints and transportation of passengers with disabilities. The DOT frequently adopts new consumer protection regulations, such as rules to protect passengers addressing lengthy tarmac delays, chronically delayed flights, codeshare disclosure and undisclosed display bias. They also have adopted, and do adopt, new rules on airline advertising and marketing practices. The DOT also has authority to review certain joint venture agreements, marketing agreements, code-sharing agreements (where an airline places its designator code on a flight operated by another airline) and wet-leasing agreements (where one airline provides aircraft and crew to another airline) between carriers and regulates other economic matters such as slot transactions.

Security Regulation

The TSA and the CBP, each a division of the U.S. Department of Homeland Security, are responsible for certain civil aviation security matters, including passenger and baggage screening at U.S. airports, and international passenger prescreening prior to entry into or departure from the United States. International flights are subject to customs, border, immigration and similar requirements of equivalent foreign governmental agencies. We are currently in compliance with all directives issued by such agencies.

Environmental Regulation

We are subject to various federal, state, foreign and local laws and regulations relating to the protection of the environment and affecting matters such as air emissions (including GHG emissions), noise emissions, discharges to surface and subsurface waters, safe drinking water, and the use, management, release, discharge and disposal of, and exposure to, materials and chemicals.

We are also subject to environmental laws and regulations that require us to investigate and remediate soil or groundwater to meet certain remediation standards. Under certain laws, generators of waste materials, and current and former owners or operators of facilities, can be subject to liability for investigation and remediation costs at locations that have been identified as requiring response actions. Liability under these laws may be strict, joint and several, meaning that we could be liable for the costs of cleaning up environmental contamination regardless of fault or the amount of wastes directly attributable to us.

GHG Emissions

Concern about climate change and greenhouse gases has resulted, and is expected to continue to result, in additional regulation or taxation of aircraft emissions in the United States and abroad. In particular, on March 6, 2017, the ICAO, an agency of the United Nations established to manage the administration and governance of the Convention on International Civil Aviation, adopted new CO2 certification standards for new aircraft beginning in 2020. The new CO2 standards apply to new aircraft type designs from 2020, and to aircraft type designs already in production as of 2023. In-production aircraft that do not meet the standard by 2028 will no longer be able to be produced unless their designs are modified to meet the new standards. In August 2016, the EPA made a final endangerment finding that GHG emissions cause or contribute to air pollution that may reasonably be anticipated to endanger public health or welfare, which obligates the EPA under the Clean Air Act to set GHG emissions standards for aircraft. On January 11, 2021, the EPA issued a proposed rule regulating GHG emissions from aircraft that largely conforms to the March 2017 ICAO standards. Like the ICAO standards, the final EPA standards would not apply retroactively to engines on in-service aircraft. These final standards have been challenged by several states and environmental groups. On November 15, 2021, the EPA announced that it would not rewrite the existing aircraft engine GHG emissions standards but would seek more ambitious new aircraft GHG emission standards within the ICAO process. The outcome of the legal challenge and whether there will be any development of new aircraft GHG emissions standards cannot be predicted at this time. On November 23, 2022, the EPA published the final rule for particulate matter emission standards and test procedures for civil aircraft engines, which took effect on January 1, 2023. There may be future rulemaking that may result in stricter GHG emissions standards than those contained in the proposed rule.

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In addition, in October 2016, ICAO adopted the CORSIA, which is a global, market-based emissions offset program designed to encourage carbon-neutral growth beyond 2020. CORSIA will increase operating costs for us and other U.S. airlines that operate internationally. CORSIA is being implemented in phases, with information sharing that began in 2019 and a pilot phase that began in 2021, to be followed by a first phase of the program beginning in 2024 and a second phase beginning in 2027. ICAO member states have agreed that 2019 emissions would continue to be used as the baseline for the CORSIA “pilot phase” (2021-2023) and that 85% of 2019 emissions would be used as the baseline for the remainder of CORSIA’s term (2024-2035). Accordingly, ICAO member countries further agreed to a long-term aspirational goal of reaching net zero aviation emissions by 2050. Countries can voluntarily participate in the pilot and first phase, and the United States agreed to participate in these voluntary phases. Participation in the second phase is mandatory for certain countries, including the United States. Certain details are still being developed and the impact cannot be fully predicted.

The costs of complying with our future obligations under CORSIA are uncertain because there is significant uncertainty with respect to the future supply and price of carbon offset credits and lower-carbon aircraft fuels. We were not required to purchase any carbon offset credits or lower-carbon aircraft fuels for the CORSIA pilot phase (2021-2023). In addition, as described above, we will not directly control our CORSIA compliance costs because our compliance obligations through 2032 are based on the growth in emissions of the global aviation sector and will begin to incorporate a factor for individual airline operator emissions growth starting in 2033.

In October 2023, the State of California adopted broad climate reporting laws that will require large businesses to report on GHG emissions and climate-related financial risk. The California laws include: Climate Corporate Data Accountability Act ("SB-253") and Greenhouse Gasses: Climate-Related Financial Risk ("SB-261"). SB-253 requires reporting entities to publicly disclose their GHG emissions on an annual basis, beginning in 2026. SB-261 requires covered entities to publicly disclose their climate-related financial risk and the measures adopted to reduce and adapt to those risks. The first report required by SB-261 will be due by January 1, 2026. It is not yet clear whether the Company will be considered a reporting entity or covered entity under SB-253 or SB-261, respectively.

Noise

Federal law recognizes the right of airport operators with special noise problems to implement local noise abatement procedures so long as those procedures do not interfere unreasonably with interstate and foreign commerce and the national air transportation system, subject to FAA review under the Airport Noise and Control Act of 1990. These restrictions can include limiting nighttime operations, directing specific aircraft operational procedures during take-off and initial climb and limiting the overall number of flights at an airport. While we have had sufficient scheduling flexibility to accommodate local noise restrictions in the past, our operations could be adversely impacted if the ICAO or locally imposed regulations become more restrictive or widespread. In addition, foreign governments may allow airports to enact similar restrictions, which could adversely impact our international operations or require significant expenditures in order for our aircraft to comply with the restrictions.

Other Regulations

Airlines are also subject to various other federal, state, local and foreign laws and regulations. For example, the U.S. Department of Justice has jurisdiction over certain airline competition matters. The privacy and security of passenger and employee data is regulated by various domestic and foreign laws and regulations.

Available Information

We make available, free of charge on our website www.suncountry.com, our annual report on Form 10-K, quarterly reports on Form 10-Q, current reports on Form 8-K, and amendments to those reports filed or furnished pursuant to the Exchange Act, as soon as reasonably practicable after electronically filing such material with, or furnishing such material to, the SEC. Materials filed with the SEC are available at www.sec.gov. The information contained on, or that can be accessed through, our website is not incorporated by reference into this Annual Report.

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ITEM 1A: RISK FACTORS

You should carefully consider the risks and uncertainties described below, as well as the other information contained in this Annual Report, including our consolidated financial statements and the related notes thereto included elsewhere in this Annual Report and “Management’s Discussion and Analysis of Financial Condition and Results of Operations.” In addition, past financial performance may not be a reliable indicator of future performance and historical trends should not be used to anticipate results or trends in future periods. Any of the following risks could materially adversely affect our business, financial condition and results of operations.

Risks Related to Our Industry

The demand for airline services is highly sensitive to changes in economic conditions, and a recession or similar or worse economic downturn in the United States would weaken demand for our services and have a material adverse effect on our business, results of operations and financial condition.

The demand for travel and Cargo services is affected by U.S. and global economic conditions. Unfavorable economic conditions have historically reduced aviation spending. For most passengers visiting friends and relatives and cost-conscious leisure travelers (our primary market), travel is a discretionary expense, and during periods of unfavorable economic conditions, travelers have often elected to replace air travel at such times with car travel or other forms of ground transportation or have opted not to travel at all. Additionally, any significant increases in unemployment in the United States would likely have a negative impact on passenger bookings, especially when the customers we serve are generally paying with their own money. Likewise, during periods of unfavorable economic conditions, businesses have deferred air travel or forgone it altogether. Additionally, retail and thus cargo demand can also decrease. Furthermore, most of our Charter revenue is generated from ad hoc, short-term contracts with repeat customers, or long-term customers with utilization variability and these customers may cease, or limit, using our services or seek to negotiate more aggressive pricing during periods of unfavorable economic conditions. Any reduction in Charter or Cargo revenue during such periods could also increase our unit costs and thus have a material adverse effect on our business, results of operations and financial condition. Travelers have also reduced spending by purchasing fewer ancillary services, which can result in a decrease in average revenue per seat. Because airlines typically have relatively high fixed costs as a percentage of total costs, much of which cannot be mitigated during periods of lower demand for air travel or Cargo services, the airline business is particularly sensitive to changes in economic conditions. A reduction in the demand for air travel or Cargo services due to unfavorable economic conditions also limits our ability to raise fares or fees for Cargo services to counteract increased fuel, labor and other costs. If U.S. or global economic conditions are unfavorable or uncertain for an extended period of time, it would have a material adverse effect on our business, results of operations and financial condition.

Inflation may have an adverse impact on our business, results of operations and financial condition.

Inflation risk is the risk that the value of assets or income will be worth less in the future as inflation decreases the value of money. In recent years, inflation increased throughout the U.S. economy. In response, the Federal Reserve raised certain benchmark interest rates in an effort to combat inflation. Inflation can adversely affect us by resulting in increased costs of goods and services, including those we use in our operations, which would increase our expenses. In addition, our customers could also be affected by inflation, which could have a negative impact on demand for air travel. If the U.S. economy continues to feel the effects of inflationary pressures, our business, results of operations and financial condition could be materially adversely affected.

Our business has been, and in the future may be, materially adversely affected by the price and availability of aircraft fuel. Unexpected increases in the price of aircraft fuel or a shortage or disruption in the supply of aircraft fuel could have a material adverse effect on our business, results of operations and financial condition.

The cost of aircraft fuel is highly volatile and is one of our largest individual operating expenses, accounting for approximately 24% and 27% of our operating expenses for the years ended December 31, 2024 and 2023, respectively. High fuel prices or increases in fuel costs (or in the price of crude oil) could have a material adverse effect on our business, results of operations and financial condition, including as a result of legacy network airlines and LCCs adapting more rapidly or effectively to higher fuel prices through new-technology aircraft that is more fuel efficient than our aircraft. Over the past several years, the price of aircraft fuel has

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fluctuated substantially and prices continue to be highly volatile. In addition, prolonged low fuel prices could limit our ability to differentiate our product and low fares from those of the legacy network airlines and LCCs, as prolonged low fuel prices could enable such carriers to, among other things, substantially decrease their costs, fly longer stages or utilize older aircraft.

Our business is also dependent on the availability of aircraft fuel (or crude oil), which is not predictable. Weather-related events, natural disasters, terrorism, wars (including as a result of the Russia-Ukraine military conflict), supply chain disruptions, political disruption or instability involving oil-producing countries, changes in governmental or cartel policy concerning crude oil or aircraft fuel production, labor strikes or other events affecting refinery production, transportation, taxes or marketing, environmental concerns, market manipulation, price speculation, changes in currency exchange rates and other unpredictable events may drive actual or perceived fuel supply shortages. Shortages in the availability of, or increases in demand for, crude oil in general, other crude oil-based fuel derivatives and aircraft fuel in particular could result in increased fuel prices and could have a material adverse effect on our business, results of operations and financial condition.

We may not be able to increase ticket prices sufficiently to cover increased fuel costs, particularly when fuel prices rise quickly. We sell a significant number of tickets to passengers well in advance of travel, and, as a result, fares sold for future travel may not reflect increased fuel costs. In addition, our ability to increase ticket prices to offset an increase in fuel costs is limited by the competitive nature of the airline industry and the price sensitivity associated with air travel, particularly leisure travel, and any increases in fares may reduce the general demand for air travel. Additionally, our Cargo and Charter customers may choose to refuse fuel pass-through contracts, which could drive down the profitability of those agreements.

From time-to-time, we may enter into fuel derivative contracts in order to mitigate the risk to our business from future volatility in fuel prices, but such contracts may not fully protect us from all related risks. In general, our Charter and Cargo operations have pass-through provisions for fuel costs, and as such we do not hedge our fuel requirements for that portion of our business. As of December 31, 2024, we had no outstanding fuel derivative contracts.

The airline industry is exceedingly competitive, and we compete against new entrants, LCCs, ULCCs, legacy network airlines and cargo carriers, as well as air travel substitutes; if we are not able to compete successfully in our markets, our business will be materially adversely affected.

We face significant competition with respect to routes, fares and services. Within the airline industry, we compete with new airlines, ULCCs, LCCs and legacy network airlines for airline passengers traveling on the routes we serve, particularly customers traveling in economy or similar classes of service. Competition on most of the routes we presently serve is intense, due to the large number of carriers in those markets. Furthermore, other airlines or new airlines may begin service or increase existing service on routes where we currently face no or little competition. In almost all instances, our competitors are larger than we are and possess significantly greater financial and other resources than we do.

The airline industry is particularly susceptible to price discounting because once a flight is scheduled, airlines incur only nominal additional costs to provide service to passengers occupying otherwise unsold seats. Increased fare or other price competition could adversely affect our operations. Airlines typically use discount fares and other promotions to stimulate traffic during normally slower travel periods to generate cash flow and to increase revenue per available seat mile. The prevalence of discount fares can be particularly acute when a competitor has excess capacity to sell. Moreover, many other airlines have unbundled their services, at least in part, by charging separately for services such as baggage and advance seat selection, which previously were offered as a component of base fares. This unbundling and other cost-reducing measures could enable competitor airlines to reduce fares on routes that we serve. The availability of low-priced fares coupled with an increase in domestic capacity has led to dramatic changes in pricing behavior in many U.S. markets. Many domestic carriers began matching lower cost airline pricing, either with limited or unlimited inventory.

During economic downturns, including during a health crisis, our competitors may choose to take an aggressive posture toward market share growth on routes where we compete, which would flood a low demand market with additional capacity that drives down fares, which could have a material adverse effect on our business, results of operations and financial condition.

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Our growth and the success of our high-growth, low-cost business model could stimulate competition in our markets through our competitors’ development of their own LCC or ULCC strategies, new pricing policies designed to compete with LCCs, ULCCs or new market entrants. Airlines increase or decrease capacity in markets based on perceived profitability. If our competitors increase overall industry capacity, or capacity dedicated to a particular domestic or foreign region, market or route that we serve, it could have a material adverse impact on our business. If a legacy network airline were to develop, continue to offer, or increase the number of its low-cost products, or if we were to experience increased competition from LCCs, our business could be materially adversely affected. Regardless of cost structure, the domestic airline industry has often been the source of fare wars undertaken to grow market share or for other reasons.

Our LCC and ULCC competitors may choose to enhance their product offerings, including the addition of premium products, which could have an adverse effect on our business, results of operations and financial condition.

Our low-cost structure is one of our primary competitive advantages. A competitor adopting an LCC or ULCC strategy may have greater financial resources and access to lower cost sources of capital than we do, which could enable them to operate their business with a lower cost structure or lower marginal revenues without substantial adverse effects than we can. Further, we have limited control over many of our costs and cannot guarantee we will be able to maintain our relatively low costs. If these competitors adopt and successfully execute an LCC or ULCC business model, or if our cost structure increases and we are no longer able to maintain a competitive cost structure, our business could be materially adversely affected.

Similarly, our competitors may choose to commence or expand their existing Charter operations, which could adversely impact our ability to obtain or renew Charter contracts, especially in periods of low demand. This could result in decreases in our Charter services market share and reduced profitability for our Charter operations, which would have a material adverse effect on our business, results of operations and financial condition.

Our competitors may also choose to commence, or expand their existing, Cargo operations. In addition, our competitors could seek to provide Cargo services to Amazon, which could adversely impact our ability to maintain or renew the A&R ATSA. This could result in reduced frequencies for our Cargo operations, which could have a material adverse effect on our business, results of operations and financial condition.

There has been significant consolidation within the airline industry and there may be additional consolidation in our industry in the future. Business combinations could significantly alter industry conditions and competition within the airline industry and could permit our competitors to reduce their fares.

The extremely competitive nature of the airline industry could prevent us from attaining the level of passenger traffic or maintaining the level of fares or ancillary revenues required to sustain profitable operations in new and existing markets and could impede our growth strategy, which could harm our operating results. Due to our relatively small size, we are susceptible to a fare war or other competitive activities in one or more of the markets we serve, which could have a material adverse effect on our business, results of operations and financial condition.

In addition to airline competition from legacy network airlines, LCCs and ULCCs, we also face competition from air travel substitutes. On our domestic routes, particularly those with shorter stage lengths, we face competition from some other transportation alternatives, such as bus, train or automobile. In addition, technology advancements may limit the demand for air travel.

Airlines are often affected by factors beyond their control, including: air traffic congestion at airports; air traffic control inefficiencies; air traffic control staffing; air traffic incidents; government shutdowns or mandates; FAA grounding of aircraft; major construction or improvements at airports; adverse weather conditions, such as hurricanes or blizzards; threatened or actual terrorist attacks, war or other security concerns; or the outbreak or rapid spread of disease, any of which could have a material adverse effect on our business, results of operations and financial condition.

Like other airlines, our business is affected by factors beyond our control, including air traffic congestion at airports, air traffic control inefficiencies, air traffic incidents, major construction or improvements at airports at

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which we operate, increased security measures, adverse weather conditions, threatened or actual terrorist attacks, war, natural disasters and the outbreak of disease. Factors that cause flight delays frustrate passengers and increase costs and decrease revenues, which in turn could adversely affect profitability. The federal government controls all U.S. airspace, and airlines are completely dependent on the FAA to operate that airspace in a safe, efficient and affordable manner. The air traffic control system, which is operated by the FAA, faces challenges in managing the growing demand for U.S. air travel. U.S. and foreign air traffic controllers often rely on outdated technologies that routinely overwhelm the system and compel airlines to fly inefficient, indirect routes resulting in delays. The federal government also controls airport security.

An accident, catastrophe or incident could have an adverse effect on the airline industry and our business, results of operations and financial condition if such accident, catastrophe or incident creates a public perception that air travel is not safe or there are air traffic controller staffing shortages. If any such accident, catastrophe or incident were to involve our aircraft or personnel or a type of aircraft in our fleet, the impact to our business, results of operations and financial condition could be even more significant.

In addition, there are proposals before Congress that would treat a wide range of consumer protection issues, which could increase the costs of doing business. Further, implementation of the Next Generation Air Transportation System, or NextGen, by the FAA would result in changes to aircraft routings and flight paths that could lead to increased noise complaints and lawsuits, resulting in increased costs. NextGen is a multi-year modernization project which had an initial target of having all major components in place by 2025. The FAA now expects to complete the remaining components by 2030. Furthermore, a federal government grounding of our aircraft type could result in flight cancellations and adversely affect our business. Governmental mandates requiring certain behaviors from employees, such as vaccine mandates, could limit our ability to staff to meet demand because employees may choose to resign or decide not to apply for or accept open positions.

Adverse weather conditions and natural disasters, such as hurricanes, thunderstorms, winter snowstorms or earthquakes, can cause flight cancellations or significant delays, and in the past have led to Congressional demands for investigations. Cancellations or delays due to adverse weather conditions or natural disasters, air traffic control problems or inefficiencies, breaches in security or other factors may affect us to a greater degree than other, larger airlines that may be able to recover more quickly from these events, and therefore could have a material adverse effect on our business, results of operations and financial condition to a greater degree than other air carriers. Because of our day of week, limited schedule and optimized utilization and point-to-point network, operational disruptions can have a disproportionate impact on our ability to recover. In addition, many airlines reaccommodate their disrupted passengers on other airlines at prearranged rates under flight interruption manifest agreements. We have been unsuccessful in procuring any of these agreements with our peers, which makes our recovery from disruption more challenging than for larger airlines that have these agreements in place.

Terrorist attacks (including attempted attacks) particularly those involving airlines, heightened security and military action in response thereto, and war could cause substantial revenue losses and increased security costs, and such event, even if not directly involving an airline, could have a material adverse effect on our business, results of operations and financial condition. Security concerns resulting in enhanced passenger screening, increased regulation governing carry-on baggage and cargo and other similar restrictions on passenger travel and cargo may further increase customer inconvenience and reduce the demand for air travel or increase costs associated with providing Cargo service. In addition, increased or enhanced security measures have tended to result in higher governmental fees imposed on airlines, resulting in higher operating costs for airlines, which we may not be able to pass on to customers in the form of higher prices.

Outbreaks or rapid spreads of pandemic or contagious viral or bacterial infections, diseases or similar public health threats, such as Ebola, measles, avian flu, severe acute respiratory syndrome (SARS), COVID-19, H1N1 (swine) flu, pertussis (whooping cough) and zika virus, or their respective variants, could result in the implementation of restrictions and regulations, including travel restrictions, quarantines, limitations on aircraft capacity, supply chain disruptions, testing requirements and restrictions on our ability to access our facilities or aircraft or requirements to collect additional passenger data or our ability to maintain a suitably skilled and sized workforce. In addition, governments, non-governmental organizations and entities in the private sector may issue non-binding advisories or recommendations regarding air travel or other physical distancing measures, including limitations on the number of persons that should be present at public gatherings, which may significantly reduce demand. These and other restrictions and regulations, as well as general concerns about

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traveling during a public health threat, could have a material adverse impact on our business, operating results, financial condition and liquidity. In the past, passenger bookings during a significant disease outbreak were, on average, closer to the date of service than in prior periods, which reduced our visibility into future revenue.

Any general reduction in airline passenger traffic could have a material adverse effect on our business, results of operations and financial condition. Moreover, U.S. federal government shutdowns may cause delays and cancellations or reductions in discretionary travel due to longer security lines, including as a result of furloughed government employees or reductions in staffing levels, including air traffic controllers. Federal government shutdowns can also affect the availability of federal resources necessary to provide air traffic control and airport security and impact our ability to take delivery of aircraft and commence operations in new domestic stations. Another extended shutdown like the instance in December 2018-January 2019 may have a negative impact on our operations and financial results.

The industry is experiencing increased competition in pilot hiring, more stringent duty time regulations, increased flight hour requirements for commercial airline pilots, reductions in the number of military pilots entering the commercial workforce, increased training requirements and other factors that have led to a shortage of pilots, which could materially adversely affect our business.

Commercial airline pilots are subject to rigorous certification standards and must adhere to flight time and rest requirements. The minimum flight hour requirement to achieve a commercial pilot’s license in the United States increased from 250 to 1,500 hours, thereby significantly increasing the time and cost commitment required to become licensed to fly a commercial aircraft. Additionally, the number of military pilots being trained by the U.S. armed forces and available as commercial pilots upon their retirement from military service has been decreasing. The FAA also mandates that pilots retire at age 65. These and other factors have led to a shortage of qualified, entry-level pilots and increased compensation costs, particularly at carriers other than the large legacy carriers. The foregoing factors have led to additional competition from carriers attempting to meet their hiring needs. With the current pilot shortage, airlines may be unable to hire adequate numbers of pilots to meet their needs, resulting in a reduction in the number of flights offered, disruptions, increased costs of operations, financial difficulties and other adverse effects, and these circumstances may become more severe in the future and thereby cause a material adverse effect on our business.

Increases in insurance costs or reductions in insurance coverage may have a material adverse effect on our business, results of operations and financial condition.

If any of our aircraft were to be involved in a significant accident or if our property or operations were to be affected by a significant natural catastrophe or other event, we could be exposed to material liability or loss. If insurance markets harden due to other airline global incidents, general aviation incidents or other economic factors, we could be unable to obtain sufficient insurance (including aviation hull and liability insurance and property and business interruption coverage) to cover such liabilities or losses, our business could be materially adversely affected.

We currently obtain war risk insurance coverage (terrorism insurance) as part of our commercial aviation hull and liability policy, and additional excess third-party war risk insurance through the commercial aviation war risk market. Our current war risk insurance from commercial underwriters excludes nuclear, radiological and certain other events. The global insurance market for aviation-related risks has been faced with significant losses, resulting in substantial tightening in insurance markets with reduced capacity and increased prices. If we are unable to obtain adequate third-party hull and liability or third-party war risk (terrorism) insurance or if an event not covered by our insurance were to take place, our business could be materially adversely affected.

The airline industry is heavily taxed.

The airline industry is subject to extensive government fees and taxation that negatively impact our revenue and profitability. The U.S. airline industry is one of the most heavily taxed of all industries. These fees and taxes have grown significantly in the past decade for domestic flights, and various U.S. fees and taxes also are assessed on international flights. In addition, the governments of foreign countries in which we operate impose on U.S. airlines, including us, various fees and taxes, and these assessments have been increasing in number and amount in recent years. Moreover, we are obligated to collect a federal excise tax, commonly referred to as the “ticket tax,” on domestic and international air transportation. We collect the excise tax, along with certain

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other U.S. and foreign taxes and user fees on air transportation (such as passenger security fees), and pass along the collected amounts to the appropriate governmental agencies. Although these taxes and fees are not our operating expenses, they represent an additional cost to our customers, that can drive down demand as we operate in a highly elastic environment. There are continuing efforts in Congress and in other countries to raise different portions of the various taxes, fees, and charges imposed on airlines and their passengers, including the passenger facility charge, and we may not be able to recover all of these charges from our customers. Increases in such taxes, fees and charges could negatively impact our business, results of operations and financial condition.

Under regulations set forth by the DOT, all governmental taxes and fees must be included in the prices we quote or advertise to our customers. Due to the competitive revenue environment, many increases in these fees and taxes have been absorbed by the airline industry rather than being passed on to the customer. Further increases in fees and taxes may reduce demand for air travel, and thus our revenues.

Restrictions on or increased taxes applicable to charges for ancillary products and services paid by airline passengers and burdensome consumer protection regulations or laws could harm our business, results of operations and financial condition.

For the years ended December 31, 2024 and 2023 we generated ancillary revenues of $307,909 and $276,133, respectively. Our ancillary revenue consists primarily of revenue generated from air travel-related services such as baggage fees, seat selection and upgrade fees, priority check-in and boarding fees, other fees and on-board sales. The DOT has rules governing many facets of the airline-consumer relationship, including, for instance, consumer notice requirements, handling of consumer complaints, price advertising, lengthy tarmac delays, oversales and denied boarding process/compensation, ticket refunds, liability for loss, delay or damage to baggage, customer service commitments, contracts of carriage, consumer disclosures and the transportation of passengers with disabilities. The DOT periodically audits airlines to determine whether such airlines have violated any of the DOT rules. If the DOT determines that we are not, or have not been, in compliance with these rules or if we are unable to remain compliant, the DOT may subject us to fines or other enforcement action. The DOT may also impose additional consumer protection requirements, including adding requirements to modify our websites and computer reservations system, which could have a material adverse effect on our business, results of operations and financial condition. The U.S. Congress and the DOT have examined the increasingly common airline industry practice of unbundling the pricing of certain products and ancillary services, a practice that is a core component of our business strategy. In 2024, the Senate’s Homeland Security Permanent Subcommittee on Investigations released a report that included criticism of ancillary product fees. If new laws or regulations are adopted that make unbundling of airline products and services impermissible, or more cumbersome or expensive, or if new taxes are imposed on ancillary revenues, our business, results of operations and financial condition could be negatively impacted. Congressional, Federal agency and other government scrutiny may also change industry practice or the public’s willingness to pay for ancillary services. See also “—Risks Related to Our Business—We are subject to extensive regulation by the FAA, the DOT, the TSA, CBP and other U.S. and foreign governmental agencies. We cannot assure you that compliance with laws, regulations, orders, rulings and guidance will not have a material adverse effect on our business, results of operations and financial condition.”

We are subject to various environmental and noise laws and regulations and risks associated with climate change, including increased regulation to reduce emissions of greenhouse gases, which could have a material adverse effect on our business, results of operations and financial condition.

We are subject to increasingly stringent federal, state, local and foreign laws, regulations and ordinances relating to the protection of the environment and noise, including those relating to emissions to the air (including air emissions associated with the operation of our aircraft), discharges (including storm water discharges) to surface and subsurface waters, safe drinking water and the use, management, disposal and release of, and exposure to, hazardous substances, oils and waste materials. We are or may be subject to new or amended laws and regulations that may have a direct effect (or indirect effect through our third-party providers, including the petroleum industry, or airport facilities at which we operate) on our operations. In addition, U.S. airport authorities are exploring ways to limit de-icing fluid discharges.

Similarly, we are subject to environmental laws and regulations that require us to investigate and remediate soil or groundwater to meet certain remediation standards. Under certain laws current and former owners or

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operators of facilities, as well as generators of waste materials disposed of at such facilities, can be subject to liability for investigation and remediation costs at facilities that have been identified as requiring response actions. Liability under these laws may be strict, joint and several, meaning that we could be liable for the costs of cleaning up environmental contamination regardless of fault or compliance with applicable law when the disposal occurred or the amount of wastes directly attributable to us.

Concern about climate change and greenhouse gases has resulted, and is expected to continue to result, in additional regulation or taxation of aircraft emissions in the United States and abroad.

Compliance with existing and future environmental laws and regulations, including, but not limited to, CORSIA, ICAO standards and any existing or new laws or regulations adopted by the SEC or states, can require significant expenditures and operational changes, and violations can lead to significant fines and penalties and reputational harm. The impact of complying with any existing and future environmental laws and regulations could have an adverse impact on our financial position, results of operations, business and prospects. Please see “Business—Government Regulation—Environmental Regulation,” for additional information on environmental regulation impacting the Company.

In the event that legislation or regulation with respect to GHG emissions associated with aircraft or applicable to the fuel industry is enacted in the United States or other jurisdictions where we operate or where we may operate in the future, or as part of international conventions to which we are subject, it could result in significant costs for us and the airline industry. In addition to direct costs, such regulation may have a greater effect on the airline industry through increases in fuel costs that could result from fuel suppliers passing on increased costs that they incur under such a system.

We also participate with other airlines in fuel consortia and fuel committees at our airports where economically beneficial, which agreements generally include cost-sharing provisions and environmental indemnities that are generally joint and several among the participating airlines. Any costs (including remediation and spill response costs) incurred by such fuel consortia could also have an adverse impact on our business, results of operations and financial condition.

In addition, ICAO and jurisdictions around the world have adopted noise regulations that require all aircraft to comply with noise level standards, and governmental authorities in several U.S. and foreign cities are considering or have already implemented aircraft noise reduction programs, including the imposition of overnight curfews and limitations on daytime take-offs and landings. Compliance with existing and future environmental laws and regulations, including emissions limitations and more restrictive or widespread noise regulations, that may be applicable to us could require significant expenditures, increase our cost base and have a material adverse effect on our business, results of operations and financial condition, and violations thereof can lead to significant fines and penalties, among other sanctions.

We are subject to extensive regulation by the FAA, the DOT, the TSA, the CBP and other U.S. and foreign governmental agencies. We cannot assure you that compliance with and changes in laws, regulations, orders, rulings and guidance will not have a material adverse effect on our business, results of operations and financial condition.

Airlines are subject to extensive regulatory and legal compliance requirements, both domestically and internationally, that impose significant costs. Compliance with and changes in the laws, regulations, orders, rulings and guidance applicable to the airline industry may increase our costs, which could have a material adverse effect on our business. In addition, the TSA imposes security procedures and requirements on U.S. airports and airlines serving U.S. airports, some of which are funded by a security fee imposed on passengers and collected by airlines, which impedes our ability to stimulate demand through low fares. We cannot forecast what additional security and safety requirements may be imposed in the future or the costs or revenue impact that would be associated with complying with such requirements. Furthermore, the DoD continues to issue new IT systems security requirements which require expenditures in order to bring our systems into compliance.

Our ability to operate as an airline is dependent on our obtaining and maintaining authorizations issued to us by the DOT and the FAA. The FAA has the authority to issue mandatory orders relating to, among other things, operating aircraft, the grounding of aircraft, maintenance and inspection of aircraft, installation of new safety-related items, and removal and replacement of aircraft parts that have failed or may fail in the future. A decision

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by the FAA to ground, or require time-consuming inspections of or maintenance on, our aircraft, for any reason, could negatively affect our business, results of operations and financial condition. Federal law requires that air carriers operating Scheduled Service be continuously “fit, willing and able” to provide the services for which they are licensed. Our “fitness” is monitored by the DOT, which considers managerial competence, operations, finances, and compliance record. In addition, under federal law, we must be a U.S. citizen (as determined under applicable law). Please see “Business—Foreign Ownership.” While the DOT has seldom revoked a carrier’s certification for lack of fitness, such an occurrence would render it impossible for us to continue operating as an airline. The DOT may also institute investigations or administrative proceedings against airlines for violations of regulations.

In the last several years, Congress has passed laws and the FAA, DOT and TSA have issued regulations, orders, rulings and guidance relating to consumer protections and to the operation, safety, and security of airlines that have required significant expenditures. We expect to continue to incur expenses in connection with complying with such laws and government regulations, orders, rulings and guidance. Additional laws, regulations, taxes and increased airport rates and charges have been proposed from time-to-time that could significantly increase the cost of airline operations or reduce the demand for air travel.

International routes are regulated by air transport agreements and related agreements between the United States and foreign governments. Our ability to operate international routes is subject to change because the applicable agreements between the United States and foreign governments may be amended from time to time. Our access to new international markets may be limited by the applicable air transport agreements between the United States and foreign governments and our ability to obtain the necessary authority from the United States and foreign governments to fly the international routes. In addition, our operations in foreign countries are subject to regulation by foreign governments and our business may be affected by changes in law and future actions taken by such governments, including granting or withdrawal of government approvals and airport slots and restrictions on competitive practices. We are subject to numerous foreign regulations in the countries outside the United States where we currently provide service. If we are not able to comply with this complex regulatory regime, our business could be significantly harmed. Please see “Business—Government Regulation.”

Our international business also exposes us to trade and economic sanctions and other restrictions imposed by the United States or other governments or organizations. The U.S. Departments of Justice, Commerce, State and Treasury, and other foreign authorities have a broad range of civil and criminal penalties they may seek to impose against corporations and individuals for violations of economic sanctions laws, export control laws, the FCPA and other federal statutes and regulations, including the International Traffic in Arms Regulations and those established by the OFAC, and similar or more restrictive foreign laws, rules and regulations, which may also apply to us. Under these laws and regulations, the government may require export licenses, or impose restrictions that would require modifications to business practices, including cessation of business activities in sanctioned countries or with sanctioned persons or entities, and modifications to compliance programs, which may increase compliance costs. Failure to implement changes may subject us to fines, penalties and other sanctions. We emphasize compliance with all applicable laws and regulations in all jurisdictions where we operate and have implemented and continue to implement and refresh policies, procedures and certain ongoing training of our employees, third-party providers and partners with regard to business ethics and key legal requirements; however, we cannot assure that our employees, third-party providers or partners will adhere to our code of ethics and other policies. In the event we believe or have reason to believe our employees, third-party providers or partners have or may have violated applicable laws or regulations, we may incur investigation costs, potential penalties and other related costs.

Changes to law, regulations or government policy that could have a material impact on us in the future include, but are not limited to, infrastructure renewal programs; changes to operating and maintenance requirements; foreign and domestic changes in customs, immigration and security policy and requirements that impede travel into or out of the United States; modifications to international trade policy, including withdrawing from trade agreements and imposing tariffs; changes to consumer protection laws; changes to public health policy; changes to financial legislation, including the partial or full repeal of the Dodd-Frank Wall Street Reform and Consumer Protection Act of 2010; public company reporting requirements; environmental regulation, including new environmental, social and governance disclosures required by the SEC; and antitrust enforcement. Any such changes could make it more difficult and/or more expensive for us to obtain new aircraft or engines and

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parts to maintain existing aircraft or engines or make it less profitable or prevent us from flying to or from some of the destinations we currently serve.

Risks Related to Our Business

If we fail to implement our business strategy successfully, our business will be materially adversely affected.

Our business strategy includes growth in our aircraft fleet, expansion of markets we serve by building out our MSP hub, growing our seat share at MSP and growing non-MSP point-to-point markets, expanding our ancillary product offering and growing our Charter service. When developing our route network, we focus on gaining market share on routes that have been underserved or are served primarily by higher cost airlines where we have a competitive cost advantage. Effectively implementing our growth strategy is critical for our business to achieve economies of scale and to sustain or increase our profitability. The COVID-19 pandemic adversely affected our growth plans and business strategy. We face numerous challenges in implementing our growth strategy, including our ability to:

•sustain our relatively low unit costs, continue to realize attractive revenue performance and maintain profitability; stimulate traffic with low fares;

•maintain an optimal level of aircraft utilization, balanced with a low aircraft acquisition cost, to execute our Scheduled, Cargo and Charter operations;

•maintain staffing levels sufficient to operate the full schedule and to grow rapidly;

•access airports located in our targeted geographic markets; and

•maintain operational performance necessary to complete all flights.

If we are unable to obtain and maintain access to a sufficient number of slots, gates or related ground facilities at desirable airports to accommodate our growing fleet, we may be unable to compete in desirable markets, our aircraft utilization rate could decrease, and we could suffer a material adverse effect on our business, results of operations and financial condition. There can be no assurances that we will be able to grow our business at MSP or in non-MSP markets as we anticipate, or at all.

Our growth is also dependent upon our ability to maintain a safe and secure operation and will require additional personnel, equipment and facilities as we induct new aircraft and continue to execute our growth plan. In addition, we will require additional third-party personnel for services we do not undertake ourselves. An inability to hire and retain personnel, timely secure the required equipment and facilities in a cost-effective manner, efficiently operate our expanded facilities or obtain the necessary regulatory approvals may adversely affect our ability to achieve our growth strategy, which could harm our business. Furthermore, expansion to new markets may have other risks due to factors specific to those markets. We may be unable to foresee all of the existing risks upon entering certain new markets or respond adequately to these risks, and our growth strategy and our business may suffer as a result. In addition, our competitors may reduce their fares and/or offer special promotions following our entry into a new market and may also offer more attractive frequent flyer programs and/or access to marketing alliances with other airlines, which we do not currently offer. We cannot assure that we will be able to profitably expand our existing markets or establish new markets.

Unauthorized use, incursion or breach of our information technology infrastructure, or that of our third-party providers, could compromise the personally identifiable information of our passengers, prospective passengers or personnel and other sensitive information and expose us to liability, damage our reputation and have a material adverse effect on our business, results of operations and financial condition.

In the processing of our customer transactions and as part of our ordinary business operations, we and certain of our third-party providers collect, process, transmit and store a large volume of personally identifiable information, including email addresses and home addresses and financial data such as credit and debit card information. This data is increasingly subject to legislation and regulation, such as the Fair Accurate Credit Transparency Act, Payment Card Industry legislation, the California Consumer Privacy Act and the European Union’s General Data Protection Regulation typically intended to protect the privacy of personal data that is collected, processed, stored and transmitted. The security of the systems and network where we and our third-party providers store this data is a critical element of our business, and these systems and our network may be

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vulnerable to theft, loss, damage and interruption from a number of potential sources and events, including computer viruses, hackers, enemy state actors, denial-of-service attacks, employee theft or misuse, natural or man-made disasters, telecommunications failures, power loss and other disruptive sources and events.

Additionally, any material failure by us or our third-party providers to maintain compliance with the Payment Card Industry security requirements or to rectify a data security issue may result in fines and restrictions on our ability to accept credit and debit cards as a form of payment. Actual or anticipated attacks may cause us to incur increasing costs, including costs to deploy additional personnel and protection technologies, train employees and engage third-party experts and consultants, or costs incurred in connection with the notifications to customers, employees, providers or the general public as part of our notification obligations to the various governments that govern our business. In addition, data and security breaches can also occur as a result of non-technical issues, including breaches by us or by persons with whom we have commercial relationships that result in the unauthorized release of personal or confidential information.

We are subject to increasing legislative, regulatory and customer focus on privacy issues and data security in the United States and abroad. In addition, a number of our commercial partners, including credit card companies, have imposed data security standards on us, and these standards continue to evolve. We will continue our efforts to meet our privacy and data security obligations; however, it is possible that certain new obligations may be difficult to meet and could increase our costs. Additionally, we must manage evolving cybersecurity risks. The loss, disclosure, misappropriation of or access to the information of our customers, personnel or business partners or any failure by us to meet our obligations could result in legal claims or proceedings, liability or regulatory penalties.

As the cyber-threat landscape evolves, attacks are growing in frequency, sophistication, and intensity, and are becoming increasingly difficult to detect. We have in the past, and may in the future, experience such cybersecurity threats.

We and the vendors who service us may not have the resources or technical sophistication to anticipate or prevent rapidly evolving types of cyber attacks. Attacks may be targeted at us, our customers (including the DoD) and our third-party service providers, including air navigation service providers, or others who have entrusted us with information, including regulators such as the DoD, FAA and DOT. In addition, attacks not targeted at us, but targeted solely at providers, may cause disruption to our computer systems or a breach of the data that we maintain on customers, employees, providers and others. Recently, several high profile consumer-oriented companies have experienced significant data breaches, which have caused those companies to suffer substantial financial and reputational harm. We cannot assure you that the precautions we have taken to avoid an unauthorized incursion of our computer systems are either adequate or implemented properly to prevent a data breach and its adverse financial and reputational consequences to our business.

A significant cybersecurity incident could result in a range of potentially material negative consequences for us, including lost revenue; unauthorized access to, disclosure, modification, misuse, loss or destruction of company systems or data; theft of sensitive, regulated or confidential data, such as personal identifying information or our intellectual property; the loss of functionality of critical systems through ransomware, denial of service or other attacks; and business delays, service or system disruptions, damage to equipment and injury to persons or property. The costs and operational consequences of defending against, preparing for, responding to and remediating an incident may be substantial. Further, we could be exposed to litigation, regulatory enforcement or other legal action as a result of an incident, carrying the potential for damages, fines, sanctions or other penalties, as well as injunctive relief requiring costly compliance measures. A cybersecurity incident could also impact our brand, harm our reputation and adversely impact our relationship with our customers, employees and stockholders.

Our Cargo business is concentrated with Amazon, and any decrease in volumes or increase in costs, or a termination of the A&R ATSA, could have a material adverse effect on our business, operations, financial condition and brand.

For the year ended December 31, 2024, Cargo revenue under the A&R ATSA represented 10% of our total operating revenues and our Cargo revenue consisted entirely of air cargo transportation services provided to Amazon under the A&R ATSA. The A&R ATSA does not require a minimum amount of flying and Amazon is permitted to decrease flying volume at any time. Our Cargo business would decline if Amazon’s use of our

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Cargo services decreases for any reason, including due to general economic conditions or preferences of Amazon and its customers, which a decline would materially adversely affect our business, results of operations, and prospects.

In addition, the profitability of the A&R ATSA is dependent on our ability to manage and accurately predict costs. Our projections of operating costs, crew productivity and maintenance expenses contain key assumptions, including flight hours, aircraft reliability, crewmember productivity, compensation and benefits and maintenance costs. If actual costs are higher than projected or aircraft reliability is less than expected, or aircraft become damaged and are out of revenue service for repair, the profitability of the A&R ATSA and future operating results may be negatively impacted. We rely on flight crews that are unionized. If CBAs increase our costs and we cannot recover such increases, our operating results would be negatively impacted. It may be necessary for us to terminate certain customer contracts or curtail planned growth.

Performance under the A&R ATSA is subject to a number of challenges and uncertainties, such as: unforeseen maintenance and other costs; our ability to hire pilots, crew and other personnel necessary to support our CMI services, which can be impacted by industry-wide staffing shortages; interruptions in the operations under the A&R ATSA as a result of unexpected or unforeseen events, whether as a result of factors within the Company’s control or outside of the Company’s control; and the level of operations and results of operations, including margins, under the A&R ATSA being less than the Company’s current expectations and projections. The A&R ATSA also contains monthly incentive payments for reaching specific on-time arrival performance thresholds and there are monetary penalties for on-time arrival performance below certain thresholds. As a result, our operating revenues may vary from period-to-period depending on the achievement of monthly incentives or the imposition of penalties. Further, we could be found in default if we do not maintain certain minimum thresholds over an extended period of time. If we are placed in default due to the failure to maintain reliability thresholds, Amazon may elect to terminate all or part of the services we provide after a cure period and pursue those rights and remedies available to it at law or in equity, in which case the 2019 Warrants would remain outstanding. Amazon may also terminate the A&R ATSA for convenience, subject to certain notice requirements and payment of a termination fee. The A&R ATSA is also subject to two, two-year extension options, which Amazon may choose not to exercise.

To the extent our volume of flying for Amazon decreases or costs associated with our Cargo business increase, or if the A&R ATSA is terminated for any reason, our business, results of operations and financial condition could be materially and adversely affected.

Our business is significantly tied to and consolidated in our main hub in Minneapolis-St. Paul, and any decrease in traffic in this hub could have a material adverse effect on our business, operations, financial condition and brand.

Our service is concentrated around our hub in MSP and our business is impacted by economic and geophysical factors of this region. We maintain a large presence in MSP. For example, approximately 94% of 2024 Scheduled Service capacity, as measured by ASMs, had MSP as either their origin or destination. Flight operations in Minneapolis can face extreme weather challenges in all seasons, but especially in the winter which at times has resulted in severe disruptions in our operation and the incurrence of material costs as a consequence of such disruptions. Our business could be further harmed by an increase in the amount of direct competition we face in the Minneapolis market or by continued or increased congestion, delays or cancellations. For instance, MSP is also a significant hub for Delta Air Lines. If we were to experience increased competition from LCCs or ULCCs, or increased competition on low-fare products from Delta airlines or another legacy network airline in the Minneapolis market, our business, results of operations and prospects could be materially adversely affected.

Our business would also be negatively impacted by any circumstances causing a reduction in demand for air transportation in the Minneapolis area, such as adverse changes in local economic conditions, local regulations and/or mandates, health concerns, adverse weather conditions, negative public perception of Minneapolis, riots, social unrest, terrorist attacks or significant price or tax increases linked to increases in airport access costs and fees imposed on passengers.

We currently operate out of Terminal 2 at MSP. Our access to use our existing gates and other facilities in Terminal 2 is not guaranteed. We cannot assure you that our continued use of our facilities at MSP will occur on

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acceptable terms with respect to operations and cost of operations, or at all, or that our ongoing use of these facilities will not include additional or increased fees.

Our reputation, brand and business could be adversely affected if we were to experience significant publicity, including in the event of an accident or similar public incident involving our aircraft or personnel, or through social media, or if we were unable to adequately protect our intellectual property rights.

We are exposed to potential significant losses and adverse publicity in the event that any of our aircraft or personnel is involved in an accident, terrorist incident or other similar public incident, which could expose us to significant reputational harm and potential legal liability. Furthermore, our customers, including Amazon, may choose not to use us for their needs following such an incident. We cannot assure you that we will not be affected by such events or that the amount of our insurance coverage will be adequate in the event such circumstances arise and any such event could cause a substantial increase in our insurance premiums. In addition, any future accident or similar incident involving our aircraft or personnel, even if fully covered by insurance or even if it does not involve our airline, may create an adverse public perception about our airline or that the equipment we fly is less safe or reliable than other transportation alternatives, or, in the case of our aircraft, could cause us to perform time-consuming and costly inspections on our aircraft or engines, any of which could have a material adverse effect on our business, results of operations and financial condition.

In addition, any accident involving the Boeing 737-NG or an aircraft similar to the Boeing 737-NG that we operate, or essential parts of our aircraft, could result in the curtailment of such aircraft or parts by aviation regulators, manufacturers and other airlines and could create a negative public perception about the safety of our aircraft, any of which could have a material adverse effect on our business, results of operations and financial condition. The pendency and resolution of any such matters or similar matters may be time-consuming and costly and could have an adverse impact on our results of operations, financial condition, business and prospects.

We may also be exposed to adverse publicity in the ordinary course of business. In the past, we have experienced customer complaints related to, among other things, product and pricing changes related to our business strategy and customer service. In particular, we have generally experienced a higher volume of complaints when we implemented changes to our unbundling policies, such as charging for seats and baggage. These complaints, together with reports of lost baggage, delayed and cancelled flights, and other service issues, are reported to the public by the DOT. In addition, we could become subject to complaints about our booking practices. Additionally, we operate in a public-facing industry with significant exposure to social media. Negative publicity, whether or not justified, can spread rapidly through social media. In particular, passengers can use social media to portray interactions with Sun Country, without context, in a manner that can be quickly and broadly disseminated. To the extent that we are unable to respond timely and appropriately to negative publicity, our reputation and brand can be harmed. Damage to our overall reputation and brand could have a negative impact on our financial results.

We consider our intellectual property rights, particularly our branding rights such as our trademarks applicable to our airline and Sun Country Rewards program, to be a significant and valuable aspect of our business. We aim to protect our intellectual property rights through a combination of trademark, copyright and other forms of legal protection, contractual agreements and policing of third-party misuses of our intellectual property, but cannot guarantee that such efforts will be successful. Any litigation or disputes regarding intellectual property may be costly and time-consuming and may divert the attention of our management and key personnel from our business operations, either of which may adversely affect our business and financial results.

We rely on third-party service providers and other commercial partners to perform functions integral to our operations, including distributing a portion of our airline tickets.

We have entered into agreements with third-party providers to furnish certain facilities and services required for our operations, including ground handling, catering, passenger handling, engineering, maintenance, refueling, reservations and airport facilities as well as administrative and support services. We are likely to enter into similar service agreements in new markets we decide to enter, and we cannot assure you that we will be able to obtain the necessary services at acceptable rates, or that such third-party providers will be available to service us.

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Although we seek to monitor the performance of third parties that furnish certain facilities or provide us with our ground handling, catering, passenger handling, engineering, maintenance, refueling, reservations and airport facilities, the efficiency, timeliness and quality of contract performance by third-party providers are often beyond our control, and any failure by our third-party providers to perform up to our expectations, or sufficiently staff their operation, may have an adverse impact on our business, reputation with customers, our brand and our operations. These service agreements are generally subject to termination after notice by the third-party providers. In addition, we could experience a significant business disruption if we were to change vendors or if an existing provider ceased to be able to serve us. We expect to be dependent on such third-party arrangements for the foreseeable future.

We also rely on third-party distribution channels, including those provided by or through GDS, conventional travel agents and OTAs, to distribute a significant portion of our airline tickets, and we expect in the future to rely on these channels to also collect a portion of our ancillary revenues. These distribution channels are more expensive and at present have less functionality in respect of ancillary revenues than those we operate ourselves, such as our website. Certain of these distribution channels also effectively restrict the manner in which we distribute our products generally. To remain competitive, we will need to successfully manage our distribution costs and rights, and improve the functionality of third-party distribution channels, while maintaining an industry-competitive cost structure. Negotiations with key GDSs and OTAs designed to manage our costs, increase our distribution flexibility, and improve functionality could be contentious, could result in diminished or less favorable distribution of our tickets, and may not provide the functionality we require to maximize ancillary revenues. In addition, in the last several years there has been significant consolidation among GDSs and OTAs. This consolidation and any further consolidation could affect our ability to manage our distribution costs due to a reduction in competition or other industry factors. Any inability to manage such costs, rights and functionality at a competitive level or any material diminishment in the distribution of our tickets could have a material adverse effect on our competitive position and our results of operations. Moreover, our ability to compete in the markets we serve may be threatened by changes in technology or other factors that may make our existing third-party sales channels impractical, uncompetitive or obsolete.

We rely heavily on technology and automated systems to operate our business, and any disruptions or failure of these technologies or systems or any failure on our part to implement any new technologies or systems could materially adversely affect our business.

We are highly dependent on technology and computer systems and networks to operate our business. These technologies and systems include our computerized airline reservation system provided by Navitaire, a unit of Amadeus, operational control systems, telecommunications systems, mobile phone application, airline website and maintenance systems as well as government and other third-party systems. In order for our operations to work efficiently, our website and reservation system must be able to accommodate a high volume of traffic, maintain secure information and deliver flight information. Our reservations system, which is hosted and maintained under a long-term contract by a third-party provider, is critical to our ability to issue, track and accept electronic tickets, conduct check-in, board and manage our passengers through the airports we serve and provide us with access to GDSs, which enlarge our pool of potential passengers. There are many instances in the past where a reservations system malfunctioned, whether due to the fault of the system provider or the airline, with a highly adverse effect on the airline’s operations, and such a malfunction has in the past and could again in the future occur on our system, a third-party system we rely on, or in connection with any system upgrade or migration. We also rely on third-party providers, including government agencies, to maintain our operational control systems, and if those systems are not functioning, we have in the past and may again experience service disruptions, which could result in the loss of important data, increase our expenses, decrease our operational performance and temporarily stall our operations, which may have a materially adverse effect on our business, results of operation, and financial condition.

Any failure of the technologies and systems we use could materially adversely affect our business. For example, if our reservation system fails or experiences interruptions, and we are unable to book seats for a period of time, we could lose a significant amount of revenue as customers book seats on other airlines, and our reputation could be harmed. Additionally, if our flight systems fail or experience disruption, we could suffer reputational harm and incur costs associated with cancelled and delayed flights. In addition, replacement technologies and systems for any service we currently utilize that experiences failures or interruptions may not be readily available on a timely basis, at competitive rates or at all. Furthermore, our current technologies and systems are heavily integrated with our day-to-day operations and any transition to a new technology or system

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could be complex and time-consuming. Our technologies and systems cannot be completely protected against events that are beyond our control, including natural disasters, cyber attacks, telecommunications failures or the failure of government or other third-party systems. We have previously experienced a software outage that resulted in cancelled flights and delayed flights for several hours, which could impact our on-time performance and completion factor. Substantial or sustained disruptions or system failures could cause service delays or failures and result in our customers purchasing tickets from other airlines. We cannot assure you that any of our security measures, change control procedures or disaster recovery plans that we have implemented are adequate to prevent disruptions or failures. In the event that one or more of our primary technology or systems vendors fails to perform and a replacement system is not available or if we fail to implement a replacement system in a timely and efficient manner, our business could be materially adversely affected.

In addition, in the ordinary course of business, our systems will continue to require modifications, upgrades and refinements to address growth and changing business requirements and to enable us to comply with changing regulatory requirements. Modifications, upgrades and refinements to our systems have been and are expected to continue to be expensive to implement and can divert management’s attention from other matters. Furthermore, our operations could be adversely affected, or we could face impositions of regulatory penalties, if we were unable to timely or effectively modify or upgrade our systems as necessary or appropriately balance the introduction of new capabilities with the management of existing systems.

We may not be able to grow or maintain our unit revenues or maintain our ancillary revenues.

A key component of our strategy was establishing Sun Country as a premier high-growth, low-cost carrier in the United States by attracting customers with low fares and garnering repeat business by delivering a high-quality customer experience with additional free amenities than traditionally provided on ULCCs in the United States. We intend to continue to differentiate our brand and product in order to expand our loyal customer base and grow or maintain our unit revenues and maintain our ancillary revenues. Differentiating our brand and product has required and will continue to require significant investment, and we cannot assure that the initiatives we have implemented will continue to be successful or that the initiatives we intend to implement will be successful. If we are unable to maintain or further differentiate our brand and product from LCCs or ULCCs, our market share could decline, which could have a material adverse effect on our business, results of operations and financial condition. We may also not be successful in leveraging our brand and product to stimulate new demand with low base fares or gain market share from the legacy network airlines.

In addition, our business strategy includes maintaining our portfolio of desirable, value-oriented, ancillary products and services. However, we cannot assure you that passengers will continue to perceive value in the ancillary products and services we currently offer and regulatory initiatives could adversely affect ancillary revenue opportunities. Failure to maintain our ancillary revenues would have a material adverse effect on our business, results of operations and financial condition. Furthermore, if we are unable to maintain our ancillary revenues, we may not be able to execute our strategy to continue to lower base fares in order to stimulate demand for air travel.

We operate a single aircraft type and may be dependent on a sole-source for the majority of our aircraft parts at certain locations within our network.

A critical cost-saving element of our business strategy is to operate a single-family aircraft fleet; however, our dependence on the Boeing 737-NG aircraft and CFM56 engines for all of our aircraft makes us vulnerable to any design defects or mechanical problems associated with this aircraft type or these engines. In the event of any actual or suspected design defects or mechanical problems with these family aircraft or engines, whether involving our aircraft or that of another airline, we may choose or be required to suspend or restrict the use of our aircraft. Our business could also be materially adversely affected if the public avoids flying on our aircraft due to an adverse perception of the Boeing 737-NG aircraft or CFM56 engines, whether because of safety concerns or other problems, real or perceived, or in the event of an accident involving such aircraft or engines.

Near term supply constraints from original equipment manufacturers pressure the availability and cost of the Boeing 737-NG aircraft and CFM56 engines Sun Country operates. While our fleet strategy partially mitigates these pressures, our business could be materially adversely impacted by broader industry trends.

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In addition, we have a contract with Delta Air Lines, Inc., or Delta, one of our competitors that is also the largest airline operating at MSP, to supply us with aircraft parts. Due to our operational strategy, we may be dependent on Delta for the majority of our aircraft parts at certain locations within our network. Accordingly, we may be vulnerable to any problems associated with the performance of Delta’s obligations to supply our aircraft parts, including design defects, mechanical problems and regulatory issues associated with engines and other parts, which would have a material adverse effect on our business, results of operations and financial condition.

Loss of the services of key personnel, increased labor costs, union disputes, employee strikes and other labor-related disruption may adversely affect our business, results of operations and financial condition.

Our success depends to a significant extent upon the efforts and abilities of our senior management team and key financial and operating personnel. In particular, we depend on the services of our senior management team, particularly Jude Bricker, our Chief Executive Officer, and Dave Davis, our President and Chief Financial Officer. Competition for highly qualified personnel is intense, and the loss of any executive officer, senior manager, or other key employee without adequate replacement or the inability to attract new qualified personnel could have a material adverse effect on our business, results of operations and financial condition. We do not maintain key-man life insurance on our management team.

In addition, our business is labor intensive, with labor costs representing approximately 34% and 32% of our total operating costs for the years ended December 31, 2024 and 2023, respectively. As of December 31, 2024, approximately 60% of our workforce was represented by labor unions. We cannot assure you that our labor costs going forward will remain competitive or that any new agreements into which we enter will not have terms with higher labor costs or that the negotiations of such labor agreements will not result in any work stoppages. In addition, one or more of our competitors may significantly reduce their labor costs, thereby providing them with a competitive advantage over us. New entrants to the market may not have unionized workforces and therefore may have substantially lower costs or better labor efficiencies. Furthermore, our labor costs may increase in connection with our growth, especially if we needed to hire more pilots in order to grow various segments of our business, including Cargo. We may also become subject to additional CBAs in the future as non-unionized workers may unionize.

Relations between air carriers and labor unions in the United States are governed by the RLA. Under the RLA, CBAs generally contain “amendable dates” rather than expiration dates, and the RLA requires that a carrier maintain the existing terms and conditions of employment following the amendable date through a multi-stage and usually lengthy series of bargaining processes overseen by the National Mediation Board, or the NMB. This process continues until either the parties have reached agreement on a new CBA, or the parties have been released to “self-help” by the NMB. In most circumstances, the RLA prohibits strikes; however, after release by the NMB, carriers and unions are free to engage in self-help measures such as lockouts and strikes.

On December 1, 2019, our dispatchers approved a new CBA. Our CBA with our dispatchers became amendable on November 30, 2024. Negotiations began in June 2024. The parties reached a tentative agreement in January 2025 and the ratification vote is expected to occur in the first quarter of 2025. Our CBA with our flight attendants is currently amendable. Negotiations with the union representing this group commenced in November of 2019. By mutual consent, the negotiations were paused in March 2020 due to the COVID-19 pandemic. We restarted negotiations in October of 2021 and in July of 2023, we and the union jointly requested the appointment of a mediator through the NMB. The parties began NMB mediated negotiations in December 2023. The parties reached a tentative agreement in February 2025 and the ratification vote is expected to occur in the first quarter of 2025. Our CBA with our pilots is amendable on December 21, 2025. Negotiations for a new CBA with our technicians and related craft employees began in October of 2022 and negotiations are ongoing with the assistance of a federal mediator appointed by the NMB. Our fleet service employees (cargo, commissary/catering, ramp agents, and bag room agents) elected to be represented by the International Brotherhood of Teamsters on January 4, 2023. Negotiations for a new CBA began in March of 2023 and are ongoing. See also “Business—Employees” in this Annual Report. The outcome of our collective bargaining negotiations cannot presently be determined and the terms and conditions of our future CBAs may be affected by the results of collective bargaining negotiations at other airlines that may have a greater ability, due to larger scale, greater efficiency or other factors, to bear higher costs than we can. In addition, if we are unable to reach agreement with any of our unionized work groups in current or future negotiations regarding the terms of their CBAs, we may be subject to work interruptions, stoppages or shortages. Any such action or other

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labor dispute with unionized employees could disrupt our operations, reduce our profitability or interfere with the ability of our management to focus on executing our business strategies. As a result, our business, results of operations and financial condition may be materially adversely affected based on the outcome of our negotiations with the unions representing our employees.

We rely on efficient daily aircraft utilization to address peak demand days of the week and months of the year, which makes us vulnerable to flight delays, flight cancellations or aircraft unavailability during peak demand periods.

We aim to optimize our daily aircraft utilization rate by tailoring service to customer demand patterns, which are seasonal and vary by day of the week. Our average daily aircraft utilization was 7.3 hours and 6.9 hours for the years ended December 31, 2024 and 2023, respectively. Aircraft utilization is block hours divided by number of days in the period divided by average aircraft. Part of our business strategy is to efficiently deploy our aircraft, which is achieved in part by higher utilization during the most profitable seasonal periods and days of the week and more limited usage of less expensive aircraft during weak demand periods. During peak demand periods, we may utilize all of our aircraft, and in the event we experience delays and cancellations from various factors, many of which are beyond our control, including air traffic congestion at airports or other air traffic control problems or outages, adverse weather conditions, increased security measures or breaches in security, international or domestic conflicts, terrorist activity, or other changes in business conditions, because we do not have accommodation arrangements with other airlines like legacy network airlines do and cannot reaccommodate passengers on our aircraft because of our limited schedule, we may incur additional costs in completing customer journeys. Due to the relatively small size of our fleet and the limited and changing nature of our Scheduled Service and our point-to-point network, the unexpected unavailability of one or more aircraft and resulting reduced capacity could have a material adverse effect on our business, results of operations and financial condition. Additionally, we frequently use all freighters in support of our Cargo business. In the event we experience a series of aircraft out of service, we would experience a decline in revenue and potentially customer satisfaction. Furthermore, in the event we are unable to procure aircraft at the price-point necessary to allow for lower utilization during weak demand periods, our costs will be higher and could have a material adverse effect on our business, results of operations and financial condition.

If we are unable to attract, retain and train qualified personnel at reasonable costs or fail to maintain our company culture, our business could be harmed.

Our business is labor intensive. We require large numbers of pilots, flight attendants, maintenance technicians and other personnel. We compete against other U.S. airlines for pilots, mechanics and other skilled labor and certain U.S. airlines offer wage and benefit packages exceeding ours. The airline industry, including related vendor partners, is experiencing and may continue to experience a shortage of qualified personnel and we face added challenges with attracting and retaining qualified personnel due to the low unemployment rate in Minnesota. In particular, as more pilots in the industry approach mandatory retirement age, or retired early during the COVID-19 pandemic, the U.S. airline industry is being affected by a pilot shortage. We and other airlines also face shortages of qualified aircraft mechanics, dispatchers, ground handlers, flight attendants and other personnel. As is common with most of our competitors, we have also faced turnover of our employees. As a result of the foregoing, we may not be able to attract, retain or train qualified personnel or may be required to increase wages and/or benefits in order to do so. If we are unable to hire, train and retain qualified employees, our business could be harmed and we may be unable to implement our growth plans.

In addition, as we hire more people and grow, we believe it may be increasingly challenging to continue to hire people who will maintain our company culture. Our company culture, which we believe is one of our competitive strengths, is important to providing dependable customer service and having a productive, accountable workforce that helps keep our costs low. As we continue to grow, we may be unable to identify, hire, retain and train enough people who meet the above criteria, including those in management or other key positions. Our company culture could otherwise be adversely affected by our growing operations and geographic diversity. If we fail to maintain the strength of our company culture, our competitive ability and our business, results of operations and financial condition could be harmed.

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Our inability to expand or operate reliably or efficiently out of airports where we operate could have a material adverse effect on our business, results of operations and financial condition and brand.

Our results of operations may be affected by actions taken by governmental or other agencies or authorities having jurisdiction over our operations at these airports, including, but not limited to:

•increases in airport rates and charges;

•limitations on take-off and landing slots, airport gate capacity or other use of airport facilities;

•termination of our airport use agreements, some of which can be terminated by airport authorities with little notice to us;

•increases in airport capacity that could facilitate increased competition;

•international travel regulations such as customs and immigration;

•increases in taxes;

•changes in law, regulations and government policies that affect the services that can be offered by airlines, in general, and in particular markets and at particular airports;

•restrictions on competitive practices;

•changes in law or ordinances that increase minimum wages beyond regional norms;

•the adoption of statutes or regulations that impact or impose additional customer service standards and requirements, including operating and security standards and requirements; and

•the adoption of more restrictive locally imposed noise regulations or curfews.

Our business is highly dependent on the availability and cost of airport services at the airports where we operate. Any changes in airport operations could have a material adverse effect on our business, results of operations and financial condition.

We are highly dependent upon our cash and investment balances, Operating Cash Flows and availability under our Revolving Credit Facility.

Our principal sources of liquidity are cash and cash equivalents, investments and availability under our Revolving Credit Facility. We are and will continue to be dependent on our Operating Cash Flows, Cash and Cash Equivalents, and Short-Term Investment balances to fund our operations, provide capital reserves and make scheduled payments on our aircraft-related fixed obligations. If our operating cash flows become insufficient to cover the entirety of our cash outflows, the Revolving Credit Facility may not be adequate to finance our operations. If we fail to generate sufficient funds from operations to meet our operating cash requirements or do not have access to availability under the Revolving Credit Facility, or other sources of borrowings or equity financing, we could default on our obligations. Our inability to meet our obligations as they become due would have a material adverse effect on our business, results of operations and financial condition.

Our liquidity would be adversely impacted, potentially materially, in the event one or more of our credit card processors were to impose holdback restrictions for payments due to us from credit card transactions.

We currently have agreements with organizations that process credit card transactions arising from purchases of air travel tickets by our customers. Credit card processors may have financial risk associated with tickets purchased for travel which can occur several weeks or months after the purchase. As of December 31, 2024, we were not subject to any credit card holdbacks under our credit card processing agreements, although if we fail to meet certain liquidity and other financial covenants, our credit card processors have the right to hold back credit card remittances to cover our obligations to them. If our credit card processors were to impose holdback restrictions on us, the negative impact on our liquidity could be significant which, could have a material adverse effect on our business, results of operations and financial condition.

Our maintenance costs will fluctuate over time; additionally we will periodically incur substantial maintenance costs due to the maintenance schedules of our aircraft fleet and obligations to the lessors, and we could incur significant maintenance expenses outside of such maintenance schedules in the

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future. The cost of aircraft repairs and maintenance and unexpected delays in the time required to complete aircraft maintenance could negatively affect our operating results.

We have substantial maintenance expense obligations. Outside of scheduled maintenance, we incur from time-to-time unscheduled maintenance which is not forecast in our operating plan or financial forecasts, and which can impose material unplanned costs and the loss of flight equipment from revenue service for a significant period of time. For example, a single unplanned engine event can require a shop visit costing several million dollars and cause the engine to be out of service for a number of weeks. We also provide flight services throughout the world and could be operating in remote regions. Our aircraft may experience maintenance events in locations that do not have the necessary repair capabilities or are difficult to reach. As a result, we may incur additional expenses and lose billable revenues that we would have otherwise earned.

Furthermore, the terms of certain of our lease agreements require us to pay maintenance reserves to the lessor in advance of the performance of major maintenance, resulting in our recording significant prepaid deposits on our Balance Sheets, and there are restrictions on the extent to which such maintenance reserves are available for reimbursement. As of December 31, 2024, all maintenance deposits are estimated to be recoverable either through reimbursable maintenance events or through application towards the purchase of the aircraft. In addition, the terms of any lease agreements that we enter into in the future could also require maintenance reserves in excess of our current requirements. Any significant increase in maintenance and repair expenses would have a material adverse effect on our business, results of operations and financial condition. Please see “Management’s Discussion and Analysis of Financial Condition and Results of Operations—Operating Expenses—Maintenance.”

We have a significant amount of aircraft and other fixed obligations that could impair our liquidity and thereby harm our business, results of operations and financial condition.

The airline business is capital intensive. As of December 31, 2024, our 45 passenger aircraft fleet consisted of 11 aircraft financed under finance leases and 34 aircraft financed under secured debt arrangements or owned outright. As of December 31, 2024, we had six aircraft that are currently on lease to unaffiliated airlines. As of December 31, 2024, we had future debt principal obligations of $330,122 and future finance lease obligations of $337,279. During 2025, based on our aircraft leases and debt structure as of December 31, 2024, we expect to make payments of $88,682 related to debt principal obligations and $37,897 related to finance lease obligations. Additionally, we made payments for maintenance reserves of $16,675 for 2024 and expect to make significant payments for maintenance reserves in the future. Our ability to pay the fixed costs associated with our contractual obligations will depend on our operating performance, cash flow, availability under the Revolving Credit Facility and our ability to secure adequate future financing, which will in turn depend on, among other things, the success of our current business strategy and our future financial and operating performance, competitive conditions, fuel price volatility, any significant weakening or improving in the U.S. economy, availability and cost of financing, as well as general economic and political conditions and other factors that are, to some extent, beyond our control. The amount of our aircraft-related fixed obligations could have a material adverse effect on our business, results of operations and financial condition and could:

•require a substantial portion of cash flows be used for aircraft leases and maintenance deposit payments and interest expense, thereby reducing the availability of our cash flow to fund working capital, capital expenditures and other general corporate purposes;

•limit our ability to obtain additional financing to support our expansion plans and for working capital and other purposes on acceptable terms or at all;

•make it more difficult for us to pay our other obligations as they become due during adverse general economic and market industry conditions because any related decrease in revenues could cause us to not have sufficient cash flows from operations to make our scheduled payments;

•reduce our flexibility in planning for, or reacting to, changes in our business and the airline industry and, consequently, place us at a competitive disadvantage to our competitors with lower fixed payment obligations; and

•cause us to lose access to one or more aircraft and forfeit our maintenance and other deposits if we are unable to make our required aircraft lease rental payments and our lessors exercise their remedies under the lease agreement, including cross-default provisions in certain of our leases.

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Our ability to obtain financing or access capital markets may be limited and there can be no assurance that we will be able to obtain sufficient funds to enable us to repay or refinance our debt obligations on commercially reasonable terms, or at all. There are a number of factors that may affect our ability to raise financing or access the capital markets in the future, including our liquidity and credit status, our operating cash flows, market conditions in the airline industry, U.S. and global economic conditions, the general state of the capital markets and the financial position of the major providers of commercial aircraft financing. A failure to pay our operating lease, debt and other fixed cost obligations or a breach of our contractual obligations, including the Credit Agreement, could result in a variety of adverse consequences, including the exercise of remedies by our creditors and lessors. In such a situation, it is unlikely that we would be able to cure our breach, fulfill our obligations, make required lease payments or otherwise cover our fixed costs and our secured lenders could foreclose against the assets securing the indebtedness owing to them, which would have a material adverse effect on our business, results of operations and financial condition.

Reduction in demand for air transportation, or governmental reduction or limitation of operating capacity, in the domestic United States, Canada, Mexico or Caribbean markets, or a reduction in demand for our Charter or Cargo operations, could harm our business, results of operations and financial condition.

A significant portion of our operations are conducted to and from the domestic United States, Canada, Mexico or Caribbean markets. Our business, results of operations and financial condition could be harmed if we lose our authority to fly to these markets, by any circumstances causing a reduction in demand for air transportation, or by governmental reduction or limitation of operating capacity, in these markets, such as adverse changes in local economic or political conditions, public health restrictions, including testing or vaccination requirements, negative public perception of these destinations, unfavorable weather conditions, public health concerns, civil unrest, violence or terrorist-related activities. Furthermore, our business could be harmed if jurisdictions that currently limit competition allow additional airlines to compete on routes we serve. In addition, a reduction in demand from our Charter customers, including as a result of decreased DoD troop movements or fewer sports events and related travel, or from Amazon under the A&R ATSA could have a material and adverse effect on our business, results of operations and financial condition.

Our quarterly results of operations fluctuate due to a number of factors, including seasonality.

We expect our quarterly results of operations to continue to fluctuate due to a number of factors, including our seasonal operations, competitive responses in key locations or routes, price changes in aircraft fuel and the timing and amount of maintenance expenses. As a result of these and other factors, quarter-to-quarter comparisons of our results of operations and comparisons of our key operating statistics may not be reliable indicators of our future performance. Seasonality may cause our quarterly results to fluctuate since historically our passengers tend to fly more during the winter months and less in the summer and fall months. We cannot assure you that we will find profitable markets in which to operate during the off-peak season. Lower demand for air travel during the fall and other off-peak months could have a material adverse effect on our business, results of operations and financial condition. We may not realize any or all of our estimated cost savings, which would have a negative effect on our results of operations.

As part of our business strategy, we expect to implement certain operational improvements and cost savings initiatives. Any cost savings that we realize from such efforts may differ materially from our estimates. Our estimates are the current estimates of the Company, but they involve risks, uncertainties, assumptions and other factors that may cause actual results, performance or achievements of the Company to be materially different from any future results, performance or achievements expressed or implied by such estimates. In addition, any cost savings that we realize may be offset, in whole or in part, by reductions in revenues, or through increases in other expenses. Any one-time costs incurred to achieve our cost savings going forward may be more than we expect and, to achieve additional cost savings, we may need to incur additional one-time costs. Our operational improvements and cost savings plans are subject to numerous risks and uncertainties that may change at any time. We cannot assure you that our initiatives will be completed as anticipated or that the benefits we expect will be achieved on a timely basis or at all. The future performance of the Company may differ significantly from the anticipated performance of the Company.

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We may become involved in litigation that may materially adversely affect us.

From time-to-time, we may become involved in various legal proceedings relating to matters incidental to the ordinary course of our business, including commercial, employment, class action, whistleblower, patent, product liability and other litigation and claims, and governmental and other regulatory investigations and proceedings. In particular, in recent years, there has been significant litigation in the United States and abroad involving airline consumer complaints. We have in the past faced, and may face in the future, claims by third parties that we have violated a passenger’s rights. Such matters can be time-consuming, divert management’s attention and resources, cause us to incur significant expenses or liability and/or require us to change our business practices. Because of the potential risks, expenses and uncertainties of litigation, we may, from time to time, settle disputes, even where we believe that we have meritorious claims or defenses. Because litigation is inherently unpredictable, we cannot assure you that the results of any of these actions will not have a material adverse effect on our business, results of operations and financial condition.

Our business model includes lessee and sublease arrangements for aircrafts, engines and aircraft equipment. Any lessee defaults or reorganizations, failure by our lessees to meet their maintenance and recordkeeping obligations, failure by our lessees to adequately insure our aircraft or obtain required licenses, consents and approvals or changes in fuel costs could materially adversely affect our business, financial condition and results of operations and result in lost revenue and additional costs.

The Company has entered into certain transactions where it serves as a lessor. Some of our lessees may experience payment difficulties, particularly in difficult economic or operating environments. The airline industry is cyclical, economically sensitive and highly competitive, and our lessees are affected by several factors over which we and they have limited control. In the event that a lessee defaults under a lease or files for bankruptcy, any security deposit paid or letter of credit provided by the lessee may not be sufficient to cover the lessee’s outstanding or unpaid lease obligations and required maintenance and transition expenses. In such instances, the lessee may not make lease payments or may return aircraft to us before the lease expires or may elect or be required to restructure the lease. If a lessee files for bankruptcy with the intent of reorganizing its business, we may agree to adjust our lease terms, including reducing lease payments by a significant amount. Certain jurisdictions give rights to the trustee in a bankruptcy to assume or reject the lease or to assign it to a third party, or entitle the lessee or another third party to retain possession of the aircraft without paying lease rentals or performing all or some of the obligations under the relevant lease. Although we have the right to repossess the aircraft and to exercise other remedies upon a lessee default, repossession of an aircraft would likely lead to significant costs for us.

The value and income producing potential of an engine or aircraft depends heavily on it being maintained in accordance with an approved maintenance system and complying with all applicable governmental directives and manufacturer requirements. Prior to an aircraft being returned in connection with an aircraft lease, we will incur costs to restore these aircraft to the condition required by the terms of the underlying leases. The amount and timing of these so-called “return conditions” costs can prove unpredictable due to uncertainty regarding the maintenance status of each particular aircraft at the time it is to be returned and it is not unusual for disagreements to ensue between the airline and the leasing company as to the required redelivery conditions on a given aircraft or engine. Also, under certain customer agreements, we are required to provide a spare aircraft while scheduled maintenance is completed. If delays occur in the completion of aircraft maintenance, we may incur additional expense to provide airlift capacity and forgo revenues. In addition, for an engine or aircraft to be available for service, all records, logs, licenses and documentation relating to maintenance and operations of the engine or aircraft must be maintained in accordance with governmental and manufacturer specifications. Our leases make the lessees primarily responsible for maintaining the engines or aircraft, keeping related records and complying with governmental directives and manufacturer requirements. Failures by lessees to meet their maintenance and recordkeeping obligations under our leases could adversely affect the value of our leased engines and aircraft and our ability to lease the engines and aircraft in a timely manner following termination of the leases.

When an aircraft is on lease, we do not directly control its operation. Nevertheless, because we hold title to the aircraft, we could be sued or held strictly liable for losses resulting from the operation of such aircraft, or may be held liable for losses on other legal theories or claims may be made against us as the owner of an aircraft requiring us to expend resources in our defense. As a result, we separately purchase contingent liability insurance and contingent hull insurance on all aircraft in our owned fleet. We also separately require our

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lessees to obtain specified levels of insurance customary in the aviation industry and indemnify us for, and insure against, liabilities arising out of the lessee’s use and operation of the aircraft. Our or our lessees’ failure to adequately insure our aircraft, or our lessees’ failure to fulfill their indemnity obligations to us, could reduce insurance proceeds otherwise payable to us in certain cases, and may result in increased costs and liabilities for our business.

Airlines are subject to extensive regulation in the jurisdictions in which they are registered and operate. As a result, we expect some of our leases will require licenses, consents or approvals, including consents from governmental or regulatory authorities for certain payments under our leases and for the import, export or deregistration of aircraft. Subsequent changes in applicable law or administrative practice may require additional licenses and consents or result in revocation of prior licenses and consents. A lessee’s failure to obtain required licenses, consents and approvals could negatively affect our ability to remarket, sell, or induct such aircraft into our fleet.

Historically, fuel prices have fluctuated widely depending primarily on international market conditions, geopolitical and environmental events, and currency exchange rates. The cost of fuel represents a major expense that is not within the control of airlines, and significant increases in fuel costs or hedges that inaccurately assess the direction of fuel costs can adversely affect our and other airlines’ operating results. Changes in fuel costs could negatively affect our lessees, and by extension, the demand for our aircraft, which may negatively impact our earnings and cash flows.

Export restrictions and tariffs may impact where we can place and deliver our aircraft and negatively impact our earnings and cash flows.

Existing export restrictions impact where we can place and deliver our aircraft. New export restrictions, including those implemented quickly or as a result of geopolitical events, may impact where we can place and deliver our aircraft or the ability of our lessees to operate our aircraft in certain jurisdictions, which may negatively impact our earnings and cash flows.

We cannot predict what further actions may ultimately be taken with respect to export controls, tariffs or trade relations between the U.S. and other countries. Accordingly, it is difficult to predict exactly how, and to what extent, such actions may impact our business, or the business of our lessees or aircraft manufacturers. Any unfavorable government policies on international trade, such as export controls, capital controls or tariffs, may affect the demand for aircraft, increase the cost of aircraft components, delay production, or impact the competitive position of certain aircraft manufacturers. In turn, this may impact where we can place and deliver our aircraft, which may negatively impact our earnings and cash flows.

Political and economic instability in the international markets we operate as well as income and other taxes could negatively affect our business and operating results due to our multi-jurisdictional operations.

Some of our target growth markets include countries with less developed economies, legal systems, financial markets and business and political environments that are vulnerable to economic and political disruptions, such as significant fluctuations in gross domestic product, interest and currency exchange rates, civil disturbances, government instability, nationalization and expropriation of private assets, trafficking and the imposition of charges by governments, as well as health and safety concerns. The occurrence of any of these events in markets served by us now or in the future and the resulting instability may have a material adverse effect on our business, results of operations and financial condition.

Due to operating in multiple jurisdictions we may also become subject to a wide range of income and other taxes. If we are unable to execute our business in jurisdictions with favorable tax treatment, our operations may be subject to significant income and other taxes. Further, any changes in tax laws in any of the jurisdictions that subject us to income or other taxes, such as increases in tax rates or limitations on our ability to deduct certain expenses from taxable income, such as depreciation expense and interest expense, could materially affect our tax obligations and effective tax rate.

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ESG matters may impose additional costs and expose us to new risks.

Public ESG and sustainability reporting is becoming more broadly expected by investors, shareholders, regulatory agencies and other third parties. Certain organizations that provide corporate governance and other corporate risk information to investors have developed, and others may in the future develop, scores and ratings to evaluate companies and investment funds based upon ESG or “sustainability” metrics. Many investment funds focus on positive ESG business practices and sustainability scores when making investments and may consider a company’s ESG or sustainability scores as a reputational or other factor in making an investment decision. In addition, investors, particularly institutional investors, use these scores to benchmark companies against their peers and if a company is perceived as lagging, these investors may engage with such company to improve ESG disclosure or performance and may also make voting decisions, or take other actions, to hold these companies and their boards of directors accountable. We may also face reputational damage in the event our corporate responsibility initiatives or objectives do not meet the standards set by our investors, shareholders, lawmakers, listing exchanges or other constituencies, or if we are unable to achieve an acceptable ESG or sustainability rating from third party rating services.

Major bank failure or sustained financial market illiquidity, or illiquidity at our clearing, cash management and custodial financial institutions, could adversely affect our business, financial condition and results of operations.

Actual events involving limited liquidity, defaults, non-performance or other adverse developments that affect financial institutions, or other companies in the financial services industry or the financial services industry generally, or concerns or rumors about any events of these kinds or other similar risks, have in the past and may in the future lead to market-wide liquidity problems. We would face certain risks in the event of a sustained deterioration of financial market liquidity, as well as in the event of sustained deterioration in the liquidity, or failure, of our clearing, cash management and custodial financial institutions. In particular, in the event of a major bank or credit card failure, we could be unable to process credit card transactions. In such a case, or if financial liquidity deteriorates for other reasons, our ability to operate our business and our financial condition and results of operations could be significantly harmed.

Risks Related to Our Indebtedness

The Credit Agreement contains, and any future indebtedness of ours could contain, restrictions that limit our flexibility.

The Credit Agreement contains, and any future indebtedness of ours could contain covenants that impose significant operating and financial restrictions on us, such as restrictions on our and our subsidiaries’ ability to, among other things:

•incur additional debt, guarantee indebtedness, or issue certain preferred equity interests;

•pay dividends on or make distributions in respect of, or repurchase or redeem, our capital stock, or make other restricted payments;

•prepay, redeem, or repurchase certain debt;

•make loans or certain investments;

•sell certain assets;

•create liens on certain assets;

•consolidate, merge, sell, or otherwise dispose of all or substantially all of our assets;

•enter into certain transactions with our affiliates;

•alter the businesses we conduct;

•enter into agreements restricting our subsidiaries’ ability to pay dividends; and

•designate our subsidiaries as unrestricted subsidiaries.

As a result of these covenants, we will be limited in the manner in which we conduct our business, and we may be unable to engage in favorable business activities or finance future operations or capital needs. These restrictive covenants may limit our ability to engage in activities that may be in our long-term best interest. The failure to comply with those covenants could result in an event of default which, if not cured or waived, could result in the acceleration of a substantial amount of our indebtedness.

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Risks Related to Ownership of Our Common Stock

Our stock price may fluctuate significantly.

The market price of our common stock could vary significantly as a result of a number of factors, some of which are beyond our control.

The following factors could affect our stock price:

•our operating and financial performance and prospects;

•quarterly variations in the rate of growth (if any) of our financial or operational indicators, such as earnings per share, net income, revenues, Adjusted Net Income, Adjusted EBITDA and Adjusted CASM;

•the public reaction to our press releases, our other public announcements and our filings with the SEC;

•strategic actions by our competitors;

•changes in operating performance and the stock market valuations of other companies;

•announcements related to litigation;

•our failure to meet revenue or earnings estimates made by research analysts or other investors;

•changes in revenue or earnings estimates, or changes in recommendations or withdrawal of research coverage, by equity research analysts;

•speculation in the press or investment community;

•sales of our common stock by us or our stockholders, or the perception that such sales may occur;

•changes in accounting principles, policies, guidance, interpretations, or standards;

•additions or departures of key management personnel;

•actions by our stockholders;

•general economic and market conditions;

•the rapid spread of a viral or bacterial infection, disease or similar public health threat and its effects;

•domestic and international economic, legal and regulatory factors unrelated to our performance;

•material weakness in our internal control over financial reporting; and

•the realization of any risks described under this “Risk Factors” section, or other risks that may materialize in the future.

The stock markets in general have experienced extreme volatility that has often been unrelated to the operating performance of particular companies. These broad market fluctuations may adversely affect the trading price of our common stock. Securities class action litigation has often been instituted against companies following periods of volatility in the overall market and in the market price of a company’s securities. Such litigation, if instituted against us, could result in very substantial costs, divert our management’s attention and resources and harm our business, financial condition, and results of operations.

Our certificate of incorporation and bylaws include provisions limiting ownership and voting by non-U.S. citizens.

To comply with restrictions imposed by federal law on foreign ownership and control of U.S. airlines, our certificate of incorporation and bylaws restrict ownership and control of shares of our common stock by non-U.S. citizens. The restrictions imposed by federal law and DOT policy require that we be owned and controlled by U.S. citizens, that no more than 25% of our voting stock be owned or controlled, directly or indirectly, by persons or entities who are not U.S. citizens, as defined in 49 U.S.C. § 40102(a)(15), that no more than 49% of our stock be owned or controlled, directly or indirectly, by persons or entities who are not U.S. citizens and are from countries that have entered into “open skies” air transport agreements with the United States, that our president and at least two-thirds of the members of our Board of Directors and other managing officers be U.S. citizens and that we be under the actual control of U.S. citizens. Our certificate of incorporation and bylaws provide that the failure of non-U.S. citizens to register their shares on a separate stock record, which we refer to as the “foreign stock record,” would result in a loss of their voting rights in the event and to the extent that the aggregate foreign ownership of the outstanding common stock exceeds the foreign ownership restrictions imposed by federal law. Our bylaws further provide that no shares of our common stock will be registered on the foreign stock record if the amount so registered would exceed the foreign ownership restrictions imposed by federal law. If it is determined that the amount registered in the foreign stock record exceeds the foreign ownership restrictions imposed by federal law, shares will be removed from the foreign stock record, resulting in

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the loss of voting rights, in reverse chronological order based on the date of registration therein, until the number of shares registered therein does not exceed the foreign ownership restrictions imposed by federal law.

The restrictions on ownership and control of shares of our common stock could adversely impact the price that investors might be willing to pay in the future for shares of our common stock.

Our future earnings and earnings per share, as reported under GAAP, could be adversely impacted by the warrants granted to Amazon. If Amazon exercises its right to acquire shares of our common stock pursuant to the 2019 Warrants, this will dilute the ownership interests of our then-existing stockholders and could adversely affect the market price of our common stock.

The warrants granted to Amazon in 2019 increase the number of diluted shares reported, which has an effect on our diluted earnings per share to the extent the warrants actually vest. The warrants have an exercise price of approximately $15.17 per share, approximately 43% of which had vested as of December 31, 2024. A portion of the 2019 Warrants will vest incrementally based on aggregate global payments by Amazon to the Company or its affiliates pursuant under both the original and A&R ATSA. In addition, vesting can occur immediately in certain circumstances, including upon a change of control (as defined in the 2019 Warrant) or certain transfers of 30% or more of the voting power in the Company to a new person or group, other than any equity offering by the Company pursuant to an effective registration statement so long as no person or group, within the meaning of the Exchange Act, acquires more than 50% of the voting power of the Company in such offering). If additional 2019 Warrants vest and Amazon exercises its right to acquire shares of our common stock pursuant to the 2019 Warrants, it will dilute the ownership interests of our then-existing stockholders and reduce our earnings per share. In addition, to the extent the common stock issued upon exercise of the 2019 Warrants is transferred to non-U.S. citizens, it will further limit the amount of our common stock that may be owned or controlled by other non-U.S. citizens. Furthermore, any sales in the public market of any common stock issuable upon the exercise of the 2019 Warrants could adversely affect prevailing market prices of our common stock.

Future sales of our common stock in the public market, or the perception in the public market that such sales may occur, could reduce our stock price.

As of December 31, 2024, we had 53,157,964 shares of common stock outstanding, warrants to purchase 9,482,606 shares of common stock, options to purchase 3,569,719 shares of common stock and 842,377 shares of common stock that may be issued upon the vesting of outstanding restricted stock units. In addition, certain of our existing stockholders, including Amazon, have certain rights to require us to register the sale of common stock held by them including in connection with underwritten offerings. Pursuant to these registration rights, we filed a "shelf" registration statement, under which Amazon could offer and sell, from time-to-time, up to 9,482,606 shares of our common stock issuable upon exercise of outstanding warrants. Additionally, we filed a registration statement in respect of all shares of common stock that we may issue under the Omnibus Incentive Plan and the SCA Acquisition Equity Plan. After registration, these shares can be freely sold in the public market upon issuance. Sales of significant amounts of stock in the public market upon expiration of lock-up agreements, the perception that such sales may occur, or early release of any lock-up agreements, could adversely affect prevailing market prices of our common stock or make it more difficult to sell shares of common stock at a time and price that you deem appropriate.

We do not anticipate paying dividends on our common stock in the foreseeable future.

We do not anticipate paying any dividends in the foreseeable future on our common stock. We intend to retain all future earnings for the operation and expansion of our business, the repayment of outstanding debt, and for general corporate purposes. The Credit Agreement contains, and any future indebtedness likely will contain, restrictive covenants that impose significant operating and financial restrictions on us, including restrictions on our ability to pay dividends and make other restricted payments. As a result, capital appreciation, if any, of our common stock may be the only source of gain for the foreseeable future. While we may change this policy at some point in the future, we cannot assure you that we will make such a change.

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We are required to pay our pre-IPO stockholders for certain tax benefits, and the amounts of such payments could be material.

We entered into an income tax receivable agreement with our pre-IPO stockholders that provides for the payment by us to our pre-IPO stockholders of 85% of the amount of cash savings, if any, in U.S. federal, foreign, state and local income tax that we and our subsidiaries actually realize for periods starting at least 12 months after the closing date of our initial public offering as a result of the utilization of tax attributes existing at the time of our initial public offering.

These tax attributes include net operating loss carryforwards, deductions, tax basis and certain other tax attributes, in each case that relate to periods (or portions thereof) ending on or prior to the closing date of our initial public offering.

We expect that the payments we make under the income tax receivable agreement could be material. Assuming no material changes in the relevant tax law, and that we and our subsidiaries earn sufficient income to realize the full tax benefits subject to the income tax receivable agreement, we expect that future payments under the income tax receivable agreement will aggregate to be approximately $97,694 as of December 31, 2024. Payments in accordance with the terms of the income tax receivable agreement could have an adverse effect on our liquidity and financial condition.

In addition, under some circumstances, including certain mergers, asset sales and other transactions constituting a “change of control” under the income tax receivable agreement or if we breach our obligations thereunder, the income tax receivable agreement will terminate and we will be required to make a payment equal to the present value of future payments under the income tax receivable agreement, which payment will be calculated based on certain assumptions, including those relating to our and our subsidiaries’ future taxable income. In these situations, our obligations under the income tax receivable agreement could have a material and adverse impact on our liquidity and could have the effect of delaying, deferring or preventing certain mergers, asset sales or other “change of control” transactions.

To the extent that we are unable to make payments under the income tax receivable agreement for any reason, such payments will be deferred and will accrue interest until paid, which could adversely affect our results of operations and could also affect our liquidity in periods in which such payments are made.

For more information on the income tax receivable agreement, see Note 13 of the Consolidated Financial Statements included in Part II, Item 8 of this Annual Report.

ITEM 1B: UNRESOLVED STAFF COMMENTS

None.

ITEM 1C: CYBERSECURITY

As a regular part of our ordinary business operations, we collect and store sensitive data, including information necessary for our operations, information from our passengers, customers (including the DoD), employees and our business partners. The secure operation of our networks and systems, and those of our business partners and third-party service providers, on which this type of information is collected, processed, maintained and stored is critical to our business operations and strategy. We recognize these networks and systems may be subject to increasing and continually evolving cybersecurity risks.

Risk Management and Strategy

A significant cybersecurity incident to us or one of our third-party partners could result in a range of potentially material negative consequences for us, which could include lost revenue; unauthorized access to, disclosure, modification, misuse, loss or destruction of Company systems or data; theft of sensitive, regulated or confidential data, such as personal identifying information or our intellectual property; the loss of functionality of critical systems through ransomware, denial of service or other attacks; and business delays, service or system disruptions, damage to equipment and injury to persons or property. The costs and operational consequences of defending against, preparing for, responding to and remediating an incident may be substantial. Further, we

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could be exposed to litigation, regulatory enforcement or other legal action as a result of an incident, carrying the potential for damages, fees, fines, sanctions or other penalties, as well as injunctive relief requiring costly compliance measures. Due to the significant competition within the airline industry, a cybersecurity incident could also impact our brand, harm our reputation and adversely impact our relationship with our customers, employees and stockholders.

For the reasons mentioned above, the secure operation of our networks and systems, and those of our business partners and third-party service providers, on which this type of information is collected, processed, maintained and stored is critical to our business operations and strategy. We regularly review and update our procedures, processes and technologies to prevent and protect against unauthorized access to, and to ensure the confidentiality, integrity, and availability of, our networks and systems. We have programs in place to identify and protect against cybersecurity weaknesses in our networks and systems, detect, contain, evaluate and respond to data security incidents and provide employee awareness training regarding phishing, malware and other cybersecurity risks.

Many of our policies align with the National Institute of Standards and Technology Cybersecurity Framework and we continually evaluate and enhance our cybersecurity procedures. Activities include mandatory online training for all employees, technical security controls, enhanced data protection, the maintenance of backup and protective systems, policy review and implementation, the evaluation and retention of cybersecurity insurance, periodic assessments of third-party service providers to assess cyber preparedness of key vendors, and running simulated cybersecurity drills, including vulnerability scanning, penetration testing and disaster recovery exercises, throughout the organization. These cybersecurity drills are performed both in-house and by third-party service providers. We use automated tools that monitor, detect, and prevent cybersecurity risks and have a third-party security operations center to alert us to any potential cybersecurity threats. We have effected comprehensive incident response plans that outline the appropriate communication flow and response for certain categories of potential cybersecurity incidents.

We rely on third-party vendors to provide software solutions that are critical to our operations. We assess cybersecurity risk during onboarding for material vendors that receive sensitive information or provide services that are critical to our business, and regularly audit these providers after onboarding. We review vendors that are material to our ordinary business operations on an annual basis and monitor these vendors for compliance with cybersecurity best practices.

To assist in the review of our cybersecurity risks, as well as the risks associated with our material vendors, we engage third-party cybersecurity professionals. For example, we engage vendors to assist in vetting the cybersecurity of our material vendors and to facilitate incident response tabletop exercises.

Governance

Role of the Board of Directors

It is the duty of the Board of Directors to serve as a prudent fiduciary for shareholders and to oversee the management of our business. Our Board of Directors is responsible for establishing accountability for our executive officers and ensuring reasonable internal controls are in place, including processes and procedures for detecting, containing, evaluating and responding to cybersecurity incidents. The Board of Directors is informed of the cybersecurity threats potentially facing the Company and the Company’s prevention activities on a quarterly basis, or more frequently if needed, through discussions and presentations with our management and individuals directly responsible for our cybersecurity. These presentations include, as applicable, reports on the overall status of the Company’s cybersecurity program, discussion of material cybersecurity matters, including the results of penetration or other security testing, security incidents, and violations of the Company’s security policy, and recommended changes to the Company’s cybersecurity program. The Board of Directors is actively engaged in the Company’s ongoing efforts to increase incident response preparedness.

Role of Management

Our management is responsible for establishing and maintaining adequate cybersecurity over the secure operation of our networks and systems, and for evaluating and monitoring our cybersecurity risks associated with our business partners and third-party service providers. The Company’s CIO and CISO are responsible for

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managing these risks. These individuals have extensive experience in technology and information security within the airline industry.

The CIO and CISO are responsible for assessing the Company’s cybersecurity risks and, in conjunction with Legal where appropriate, establishing and maintaining a cybersecurity program to manage such risks. For example, the CIO and CISO oversee cybersecurity training for our employees and establish standards used to evaluate and monitor the process and control requirements we expect of our third-party partners as part of the Company’s overall cybersecurity program. The CIO and CISO lead a team that includes third-party cybersecurity professionals to administer the Company’s cybersecurity program. The CIO and CISO are responsible for the reporting of cybersecurity matters to the Board of Directors.

ITEM 2. PROPERTIES

Aircraft Fleet

We fly Boeing 737-NG aircraft, which we believe provides us significant operational and cost advantages compared to airlines that operate multiple fleet types. Flight crews are interchangeable across all of our aircraft, and maintenance, spare parts inventories and other operational support are highly simplified relative to more complex fleets. As of December 31, 2024, Sun Country's fleet consisted of 63 Boeing 737-NG aircraft, comprised of 58 Boeing 737-800s and five Boeing 737-900ERs. This includes 45 aircraft in the passenger fleet, 12 cargo operated aircraft through the A&R ATSA with Amazon, and six aircraft that are currently on lease to unaffiliated airlines. We do not have an aircraft order book because we only purchase mid-life aircraft. As a result, unlike many other airlines, we are not locked into large future capital expenditures. Rather, we opportunistically take advantage of aircraft prices with purchases at the time of our choosing.

As of December 31, 2024, we operated 45 aircraft in our passenger fleet. Of these passenger aircraft, 11 were financed under finance leases, 27 of the owned aircraft were financed and seven aircraft were unencumbered. The average age of the passenger aircraft in our fleet was approximately 16 years as of December 31, 2024.

The Company also has six aircraft that are currently on lease to unaffiliated airlines, which is comprised of four Owned Aircraft Held for Operating Lease and two subleased aircraft. The Company owns five Boeing 737-900ERs, four of which are currently on lease. The fifth aircraft is currently being inducted into the Company's passenger fleet. The Company is entitled to fixed payments over the remaining lease term for each aircraft, which expire at various dates through the fourth quarter of 2025. In January 2025, amendments were executed to extend the lease expiry terms for three of the four remaining Owned Aircraft Held for Operating Lease, which now expire over various dates through the fourth quarter of 2026. On each lease expiry date, the Owned Aircraft Held for Operating Lease will be redelivered to Sun Country and are expected to be inducted into the Company’s fleet. The average age of the Owned Aircraft Held for Operating lease in our fleet was approximately 10 years as of December 31, 2024.

The Company has subleased two Boeing 737-800 aircraft, which will be delivered to Sun Country on the sublease expiry date. The subleases are classified as operating leases and do not relieve the Company of its primary lease obligations with the lessor. The Company operates the subleased aircraft under finance leases and will continue to be leased upon redelivery. The Company is entitled to fixed payments over the remaining lease terms, with additional variable lease payments based on aircraft utilization. During the year ended December 31, 2024, amendments were executed to extend the lease expiry terms for both subleased aircraft through November 2025. Upon expiry of these subleases, both aircraft will be redelivered to the Company and are expected to be inducted into the Company's passenger fleet. The average age of the two subleased aircraft was approximately 11 years as of December 31, 2024.

We currently operate 12 aircraft dedicated to our Cargo business. These freighters had an average age of 22 years as of December 31, 2024. All freighters are subleased directly from Amazon and we operate them pursuant to the A&R ATSA. In June 2024, the Company entered into the A&R ATSA with Amazon that will increase the number of Boeing 737-800 cargo aircraft that Sun Country operates on behalf of Amazon from 12 to 20. The first additional aircraft was received in January 2025 and is expected to begin service in the first quarter of 2025. All eight additional aircraft are expected to be operational by the end of the third quarter of 2025. Based upon review of the A&R ATSA, the sublease arrangement does not qualify as a lease under ASC 842, Leases, because the Company does not control the use of the aircraft. As such, no right-of-use asset and

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lease liability is recognized in these financial statements for the Amazon arrangement. This conclusion is unchanged from the original ATSA.

Facilities

In most of the airports we serve, we do not directly lease facilities, but rather operate under flexible common use agreements. This facilitates our strategy of entering and exiting markets to service periods of peak demand. Our terminal passenger service facilities, which include ticket counters, gate space, operational support space and baggage service offices, generally have month-to-month terms or are used on a per use basis. For any leased space we are typically responsible for maintenance, insurance and other facility-related expenses and services under these agreements. We also have entered into use agreements at many of the airports we serve that provide for the non-exclusive use of runways, taxiways and other facilities. Landing fees under these agreements are based on the number of landings and weight of the aircraft.

We primarily operate out of eight of the 14 gates at Terminal 2 at MSP, which we have access to on an "Enhanced Priority" basis through 2028, with common use access to the remaining gates. All other leases for our terminal passenger service facilities, which include operational support space and baggage service offices, are leased on a month-to-month basis.

Gate space and ticket counter space is used and billed on a per operation (each arrival and departure) basis until an annual operating cap is met. Our leases also include two hangars:

•108,000 square foot maintenance hangar, which includes office space and is where we provide certain maintenance on our aircraft; and

•90,000 square foot office and hangar facility which has been converted into our corporate headquarters.

For Charter service with an origin or destination where we do not have ground handling capabilities, we arrange with airports, fixed base operators or military bases to provide ground services on an as needed basis.

Our principal executive offices and headquarters are presently located on MSP property at 2005 Cargo Road, Minneapolis, Minnesota 55450, consisting of approximately 90,000 square feet, under a lease which expires in February 2029.

ITEM 3: LEGAL PROCEEDINGS

We are subject to commercial litigation claims and to administrative and regulatory proceedings and reviews that may be asserted or maintained from time to time. We currently believe that the ultimate outcome of such lawsuits, proceedings and reviews will not, individually or in the aggregate, have a material adverse effect on our financial position, liquidity or results of operations.

ITEM 4: MINE SAFETY DISCLOSURES

Not applicable.

PART II

ITEM 5: MARKET FOR REGISTRANT’S COMMON EQUITY, RELATED STOCKHOLDER MATTERS AND ISSUER PURCHASES AND EQUITY SECURITIES

Market Information

On March 17, 2021, our common stock began trading on the Nasdaq under the symbol “SNCY”. Prior to that date, there was no public market for our common stock. As of December 31, 2024, there were 53,157,964 shares of common stock outstanding and held of record by approximately three stockholders and no shares of preferred stock were outstanding. The number of record holders of our common stock does not include DTC participants or beneficial owners holding shares through nominee names. We are unable to estimate the total

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number of stockholders represented by the holders. For this reason, the actual number of stockholders is greater than this number of record holders.

Dividend Policy

We have not to date paid any cash dividends on our common stock and we currently do not intend to pay cash dividends on our common stock in the foreseeable future. However, we may, in the future, decide to pay dividends on our common stock. Any declaration and payment of cash dividends in the future, if any, will be at the discretion of our board of directors and will depend upon such factors as earnings levels, cash flows, capital requirements, levels of indebtedness, restrictions imposed by applicable law, our overall financial condition, restrictions in our debt agreements, and any other factors deemed relevant by our board of directors.

Securities Authorized for Issuance under Equity Compensation Plans

The Company has 3,600,000 shares authorized under the Sun Country Airlines Holdings, Inc. 2021 Omnibus Incentive Plan, of which 2,241,578 remain available as of December 31, 2024. For more information on the Company's compensation plans, see Note 9 to the Consolidated Financial Statements included in Part II, Item 8, "Financial Statements" of this Annual Report.

Plan category	Number of securities to<br>be issued upon<br>exercise of outstanding<br>options, warrants and<br>rights	Weighted-average<br>exercise price of<br>outstanding<br>options, warrants<br>and rights		Number of securities<br>remaining available for<br>future issuance under<br>equity compensation<br>plans
Sun Country Airlines Holdings, Inc. 2021 Omnibus Incentive Plan	68,540	$	33.03	2,241,578
Sun Country Airlines 2018 Equity Incentive Plan	3,501,179	$	5.94	—
Total	3,569,719	$	6.46	2,241,578

Purchases of Equity Security by the Issuer and Affiliated Purchasers

The Company may purchase shares of its Common Stock on a discretionary basis from time-to-time through open market repurchases, privately negotiated transactions, accelerated share repurchase, or other means, including through Rule 10b5-1 trading plans. Any repurchases made under this program will be funded from the Company’s existing cash flows, or future cash flows. The Company did not repurchase any shares of its Common Stock during the three months ended December 31, 2024. As of December 31, 2024, the Company did not have any remaining amount of Board authorization to repurchase shares of its Common Stock.

Subsequent to December 31, 2024, the Company received authorization from its Board of Directors to repurchase up to $10,000 of its Common Stock in connection with a secondary public offering by the SCA Horus Stockholder. As part of this transaction, the Company repurchased 630,914 shares of its Common Stock, for a total cost of $10,000, or an average price of $15.85 per share.

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Stock Performance Graph

The following graph compares the cumulative total return from March 17, 2021 through December 31, 2024 on our common stock with the cumulative total return on the NASDAQ Composite Index and the NYSE ARCA Airline Index. The graph assumes that the value of the investment on our common stock and each of the Indexes was $100 on March 17, 2021, and further assumes that all dividends are reinvested.

	3/17/2021		12/31/2021		12/31/2022		12/31/2023		12/31/2024
SNCY	$	100.00	$	74.90	$	43.60	$	43.24	$	40.08
NYSE Arca Airline Index	100.00		71.28		46.12		59.15		58.56
NASDAQ Composite Index	100.00		115.67		77.39		110.99		142.78

The stock performance depicted in the graph above represents historical performance and is not to be relied upon as indicative of future performance.

ITEM 6: [RESERVED]

ITEM 7: MANAGEMENT’S DISCUSSION AND ANALYSIS OF FINANCIAL CONDITION AND RESULTS OF OPERATIONS

Unless otherwise indicated, the terms "Sun Country," "we," "us" and "our" refer to Sun Country Airlines Holdings, Inc., and its subsidiaries.

The following discussion and analysis presents factors that had a material effect on our results of operations during the years ended December 31, 2024 and 2023. Also discussed is our financial position as of December 31, 2024 and 2023. Unless expressly stated otherwise, for discussion and analysis of fiscal year 2022 items and fiscal year 2023 compared to fiscal year 2022, please refer to Item 7 of Part II, "Management's Discussion and Analysis of Financial Condition and Results of Operations" in our Annual Report on Form 10-K, for the fiscal year ended December 31, 2023, which was filed with the SEC and is incorporated herein by reference. This section should be read in conjunction with our Consolidated Financial Statements and related

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notes appearing elsewhere in this Annual Report. This discussion contains forward-looking statements that involve risks, assumptions and uncertainties, such as statements of our plans, objectives, expectations, intentions and forecasts. Our actual results and the timing of selected events could differ materially from those discussed in these forward-looking statements as a result of several factors, including those set forth under the section of this Annual Report titled “Risk Factors” “Cautionary Note Regarding Forward-Looking Statements” and elsewhere in this Annual Report. The “Risk Factors” and the “Cautionary Note Regarding Forward-Looking Statements” should be read carefully to gain an understanding of the important factors that could cause actual results to differ materially from our forward-looking statements.

Business Overview

Sun Country is a new breed of hybrid low-cost air carrier that dynamically deploys shared resources across our synergistic Scheduled Service, Charter, and Cargo businesses. By doing so, we believe we are able to generate high growth, high margins and strong cash flows with greater resilience than other passenger airlines. Based in Minnesota, we focus on serving leisure and VFR passengers, Charter customers and providing CMI service to Amazon, with flights throughout the U.S. and to destinations in Canada, Mexico, Central America and the Caribbean. We share resources, such as flight crews, across our Scheduled Service, Charter and Cargo business lines with the objective of generating high returns and margins and mitigating the seasonality of our route network. We optimize capacity using an agile peak demand scheduling strategy which aims to shift flying to markets during periods of peak demand and away from markets during periods of low demand. This allows us to produce higher unit revenue with a competitive low-cost structure, in line with other ULCCs resulting in best-in-class unit profitability, while also providing greater resiliency to economic or industry downturns.

Operations in Review

We believe a key component of our success is establishing Sun Country as a high growth, low-cost carrier in the United States by attracting customers with low fares and garnering repeat business by delivering a high-quality passenger experience, offering state-of-the-art interiors, complimentary streaming of in-flight entertainment to passenger devices, seat reclining and seat-back power in all of our aircraft.

Our diversified business model, which includes a focus on leisure and VFR passengers, Charter and Cargo service, is unique in the airline sector and helps mitigate the impact of economic and industry downturns on our business when compared with other large U.S. passenger airlines. Our business model is flexible, which gives us the ability to adjust our services in response to market conditions and is intended to produce the highest possible returns for Sun Country. In June 2024, the Company entered into the A&R ATSA with Amazon that will result in an increase in the number of Boeing 737-800 cargo aircraft that we operate on behalf of Amazon from 12 to 20. The first additional aircraft was received in January 2025 and is expected to begin service in the first quarter of 2025. All eight additional aircraft are expected to be operational by the end of the third quarter of 2025. In the near term, the increase in aircraft that we operate on behalf of Amazon will result in more resources being allocated to the Cargo business. This aligns with our strategy of long-term flexibility and supports our ability to mitigate the impact of economic and industry downturns on our business.

The impact of macroeconomic conditions, continue to impact the Company, as well as the industry. For example, airports were using CARES Act funding to mitigate certain price increases. As of December 31, 2024, these funds have been largely exhausted, resulting in price increases. Certain of our operating costs have been further impacted by inflationary pressures, supply chain issues, and other macroeconomic conditions. To date, our strategy has allowed us to offset a majority of additional costs associated with the impact of macroeconomic conditions. Additionally, our Charter and Cargo businesses have the ability to pass on certain costs to customers.

For more information on our business and strategic advantages, see the "Business" section within Part I, Item 1 of this Annual Report.

Operating Revenues

Scheduled Service. Scheduled Service revenue mainly consists of base fares and expired passenger travel credits.

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Charter. Charter revenue consists of revenue earned from our Charter business, primarily generated through our service to the DoD, collegiate and professional sports teams, and casinos.

Ancillary. Ancillary revenue consists primarily of revenue generated from air travel-related services, such as baggage fees, seat selection and upgrade fees, priority check-in and boarding fees, other fees and on-board sales.

Cargo. Cargo revenue consists of air cargo transportation services under the A&R ATSA with Amazon, primarily related to e-commerce delivery services.

Other. Other revenue consists primarily of revenue from services in connection with our SCV products, including organizing ground services, such as hotel, car and transfers, as well as the rental revenue related to certain transactions where we act as a lessor. Other revenue also includes services not directly related to providing passenger services such as the advertising, marketing and brand elements resulting from our co-branded credit card program.

Operating Expenses

Aircraft Fuel. Aircraft fuel expense includes jet fuel, federal and state taxes, and other fees. Aircraft fuel expense can be volatile, even between quarters, due to global economic and geopolitical factors, as well as domestic and local supply factors that impact the price of crude oil.

Salaries, Wages, and Benefits. Salaries, wages, and benefits expense includes salaries, hourly wages, bonuses, equity-based compensation, and profit sharing paid to employees for their services, as well as related expenses associated with medical benefits, employee benefit plans, employer payroll taxes and other employee related costs.

Aircraft Rent. Aircraft rent expense consists of monthly lease charges for aircraft and spare engines under the terms of the related operating leases and is recognized on a straight-line basis. Aircraft rent expense also includes supplemental rent, which consists of maintenance reserves paid to aircraft lessors in advance of the performance of significant maintenance activities that are not probable of being reimbursed to us by the lessor during the lease term, as well as lease return costs, which consist of probable costs that would be incurred at the return of the aircraft, including costs incurred to return the airframe and engines to the condition required by the lease. As of December 31, 2024, we are not operating any aircraft under an operating lease. The acquisition of future aircraft through operating leases is at the discretion of management.

Maintenance. Maintenance expense includes the cost of all parts, materials and fees for repairs performed by us and our third-party vendors to maintain our fleet. It excludes direct labor costs related to our own mechanics, which are included in salaries, wages, and benefits expense. It also excludes maintenance expenses, which are deferred based on the built-in overhaul method for owned and certain finance leased aircraft, which is subsequently amortized as a component of depreciation and amortization expense.

Sales and Marketing. Sales and marketing expense includes credit card processing fees, travel agent commissions and related GDS fees, advertising, sponsorship and distribution costs, such as the costs of our call centers, and costs associated with our loyalty program. It excludes related salary and wages of personnel, which are included in salaries, wages, and benefits expense.

Depreciation and Amortization. Depreciation and amortization expense includes depreciation of fixed assets we own, amortization of leasehold improvements, amortization of finance leased assets, as well as the amortization of certain finite-lived other intangible assets. It also includes the depreciation of significant maintenance expenses deferred under the built-in overhaul method for owned and certain finance leased aircraft.

Ground Handling. Ground handling includes ground services at airports, including baggage handling, ticket counter and other ground services.

Landing Fees and Airport Rent. Landing fees and airport rent includes aircraft landing fees and charges for the use of airport facilities.

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Other Operating. Other operating expenses include crew and other employee travel, interrupted trip expenses, information technology, property taxes and insurance, including hull-liability insurance, supplies, legal and other professional fees, facilities and all other administrative and operational overhead expenses.

Non-operating Income (Expense)

Interest Income. Interest income includes interest on our cash, cash equivalents and investment balances.

Interest Expense. Interest expense includes interest and fees related to our outstanding debt and our finance leases, as well as the amortization of debt financing costs.

Other, net. Other expenses include activities not classified in any other area of the Consolidated Statements of Operations, such as changes in the TRA Liability.

Income Taxes

Income taxes are accounted for using the asset and liability method. Deferred taxes are recorded based on differences between the financial statement basis and tax basis of assets and liabilities and available tax loss and credit carryforwards.

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Operating Statistics

Key Operating Statistics and Metrics

	Year Ended December 31, 2024 (1)							Year Ended December 31, 2023 (1)
	Scheduled Service		Charter		Cargo	Total		Scheduled Service		Charter		Cargo	Total
Departures (2)	29,039		10,359		13,094	53,009		26,144		10,387		13,009	50,040
Block hours (2)	92,391		20,775		33,744	148,518		82,618		21,154		34,592	139,841
Aircraft miles (2)	36,060,794		7,191,928		12,770,713	56,538,114		32,494,683		7,331,362		13,145,001	53,450,328
ASMs (thousands) (2)	6,707,308		1,270,455			8,071,949		6,044,011		1,286,175			7,416,189
TRASM (cents) (3)	10.87		15.51			11.47		12.27		14.78			12.56
Average passenger aircraft during the period (4)						43.0							41.8
Passenger aircraft at end of period (4)						45							42
Leased aircraft (5)						6							6
Cargo aircraft at end of period						12							12
Average daily aircraft utilization (hours) (4)						7.3							6.9
Average stage length (miles)						1,098							1,090
Revenue passengers carried (6)	4,483,515							4,140,663
Revenue passenger miles (RPMs) (thousands) (6)	5,648,351							5,217,852
Load factor (6)	84.2%							86.3%
Average base fare per passenger (6)	$	91.25						$	109.61
Ancillary revenue per passenger (6)	$	68.68						$	66.69
Total fare per passenger (6)	$	159.93						$	176.30
Charter revenue per block hour (6)			$	9,485						$	8,988
Fuel gallons consumed (thousands) (2)	71,631		13,666			86,185		64,450		14,299			79,574
Fuel cost per gallon, excluding indirect fuel credits						$	2.77						$	3.11
Employees at end of period						3,141							2,783
CASM (cents) (7)						12.01							12.43
Adjusted CASM (cents) (8)						7.59							7.49

__________________________

(1)Certain operating statistics and metrics are not presented as they are not calculable or are not utilized by management.

(2)Total System operating statistics for Departures, Block hours, Aircraft miles, ASMs and Fuel gallons consumed include amounts related to flights operated for maintenance; therefore, the Total System amounts are higher than the sum of Scheduled Service, Charter and Cargo amounts.

(3)Scheduled Service TRASM includes Schedule Service revenue, Ancillary revenue, and ASM generating revenue classified within Other Revenue on the Consolidated Statements of Operations.

(4)Scheduled Service and Charter utilize the same fleet of aircraft. Aircraft counts and utilization metrics are shown on a system basis only.

(5)Includes both the Company's Owned Aircraft Held for Operating Lease as well as subleased aircraft.

(6)Passenger-related statistics and metrics are shown only for Scheduled Service. Charter revenue is driven by flight statistics.

(7)CASM is a key airline cost metric. CASM is defined as operating expenses divided by total available seat miles.

(8)Adjusted CASM is a non-GAAP measure derived from CASM by excluding fuel costs, costs related to our Cargo operations, and certain other costs that are unrelated to our airline operations.

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Results of Operations

For the Years Ended December 31, 2024 and 2023

	Year Ended December 31,				%<br>Change
	2024		2023
Operating Revenues:
Scheduled Service	$	409,133	$	453,862	(10)	%
Charter	197,045		190,128		4	%
Ancillary	307,909		276,133		12	%
Passenger	914,087		920,123		(1)	%
Cargo	107,174		99,735		7	%
Other	54,478		29,762		83	%
Total Operating Revenues	1,075,739		1,049,620		2	%
Operating Expenses:
Aircraft Fuel	237,160		246,669		(4)	%
Salaries, Wages, and Benefits	326,775		295,640		11	%
Aircraft Rent	—		2,281		(100)	%
Maintenance	68,770		60,588		14	%
Sales and Marketing	34,935		34,105		2	%
Depreciation and Amortization	94,989		88,151		8	%
Ground Handling	42,118		37,506		12	%
Landing Fees and Airport Rent	59,549		49,615		20	%
Other Operating, net	105,457		107,565		(2)	%
Total Operating Expenses	969,753		922,120		5	%
Operating Income	105,986		127,500		(17)	%
Non-operating Income (Expense), net:
Interest Income	7,833		10,180		(23)	%
Interest Expense	(44,300)		(42,634)		4	%
Other, net	55		(887)		106	%
Total Non-operating Expense, net	(36,412)		(33,341)		9	%
Income before Income Tax	69,574		94,159		(26)	%
Income Tax Expense	16,671		21,978		(24)	%
Net Income	$	52,903	$	72,181	(27)	%

Total Operating Revenues increased $26,119, or 2%, to $1,075,739 for the year ended December 31, 2024 as compared to the year ended December 31, 2023. The revenue growth was driven by an increase in rental revenue included within Other revenue, as well as an increase in Cargo revenue due to the A&R ATSA, partially offset by a decrease in Passenger revenue as a result of a 9% decrease in total fare per passenger which was impacted by increased industry capacity. These items are discussed in further detail below.

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Passenger. Passenger revenue decreased by $6,036, or 1%, to $914,087 for the year ended December 31, 2024 as compared to the year ended December 31, 2023. The table below presents select operating data for lines of revenue within Passenger:

		Year Ended December 31,						%<br>Change
		2024			2023
Scheduled Service and Ancillary Statistics:
	Departures	29,039			26,144			11	%
	Block Hours	92,391			82,618			12	%
	Passengers	4,483,515			4,140,663			8	%
	Average base fare per passenger	$	91.25		$	109.61		(17)	%
	Ancillary revenue per passenger	$	68.68		$	66.69		3	%
	Total Fare per passenger	$	159.93		$	176.30		(9)	%
	RPMs (thousands)	5,648,351			5,217,852			8	%
	ASMs (thousands)	6,707,308			6,044,011			11	%
	TRASM (cents)	10.87			12.27			(11)	%
	Passenger load factor	84.2		%	86.3		%	(2)	%
Charter Statistics:
	Departures	10,359			10,387			—	%
	Block hours	20,775			21,154			(2)	%
	Charter revenue per block hour	$	9,485		$	8,988		6	%

The year-over-year decreases in both total fare per passenger and TRASM were impacted by increased capacity across the industry. The fare decreases were offset by a 6% increase in average daily aircraft utilization and growth in the passenger fleet, which supported an increase in volume. As a result, Scheduled Service departures and ASMs both increased by 11%, which drove the 8% increase in Scheduled Service passengers. The increase in capacity also had an impact on the 2 percentage points reduction in load factor. The 8% increase in Scheduled Service passengers during the period also resulted in greater sales of ancillary products.

Passenger revenue was further supported by the $6,917 increase, or 4%, to $197,045 for Charter revenue during the year ended December 31, 2024, as compared to the year ended December 31, 2023. The increase was primarily due to the 6% increase in Charter revenue per block hour. The improvement in Charter revenue per block hour was due to rate increases and management initiatives to reduce the number of ferry flights.

Cargo. Revenue from Cargo services increased $7,439, or 7%, to $107,174 for the year ended December 31, 2024, as compared to the year ended December 31, 2023. The increase was primarily driven by rate escalations as a result of the A&R ATSA, partially offset by a 2% year-over-year decrease in block hours.

Other. Other revenue increased $24,716, or 83%, to $54,478 for the year ended December 31, 2024, as compared to the year ended December 31, 2023. Other revenue benefited from the $42,320 of lease related revenue primarily associated with an average of seven leased aircraft during the year ended December 31, 2024, as compared to $18,457 in rental revenue associated with an average of four leased aircraft during the year ended December 31, 2023. For more information on the components of our lease income, see Note 8 to the Consolidated Financial Statements included in Part II, Item 8 of this Annual Report.

Operating Expenses

Aircraft Fuel. We believe Aircraft Fuel expense, excluding indirect fuel credits, is the best measure of the effect of fuel prices on our business as it consists solely of direct fuel expenses that are related to our operations and is consistent with how management analyzes our operating performance. This measure is defined as GAAP Aircraft Fuel expense, excluding indirect fuel credits that are recognized within Aircraft Fuel expense, but are not directly related to our Fuel Cost per Gallon.

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The primary components of Aircraft Fuel expense are shown in the following table:

	Year Ended December 31,				%<br>Change
	2024		2023
Total Aircraft Fuel Expense	$	237,160	$	246,669	(4)	%
Indirect Fuel Credits	1,461		976		50	%
Aircraft Fuel Expense, Excluding Indirect Fuel Credits	$	238,621	$	247,645	(4)	%
Fuel Gallons Consumed (thousands)	86,185		79,574		8	%
Fuel Cost per Gallon, Excluding Indirect Fuel Credits	$	2.77	$	3.11	(11)	%

Aircraft Fuel expense decreased by 4% year-over-year, primarily due to a 11% decrease in the average fuel cost per gallon, partially offset by an 8% increase in consumption as a result of increased operations.

Salaries, Wages, and Benefits. Salaries, wages, and benefits expense increased $31,135, or 11%, to $326,775 for the year ended December 31, 2024, as compared to the year ended December 31, 2023. The year-over-year increase in Salaries, Wages, and Benefits was due to a 13% increase in employee headcount to support the increase in total system block hours as a result of operational growth, and contractual rate increases for our pilots; partially offset by an acceleration of stock-based compensation expense recognized during the prior year for the vesting of our time-based and performance-based stock options.

Aircraft Rent. Aircraft rent expense decreased by $2,281, to $0 for the year ended December 31, 2024, as compared to the year ended December 31, 2023. Aircraft Rent expense decreased due to the composition of our aircraft fleet shifting from aircraft under operating leases to all owned aircraft or aircraft under finance leases.

Maintenance. Maintenance expense increased $8,182, or 14%, to $68,770 for the year ended December 31, 2024, as compared to the year ended December 31, 2023. The year-over-year increase in Maintenance expense was primarily driven by an increase in routine, time-based heavy maintenance and landing gear events, as well as the increase in the size of our fleet and operations.

Sales and Marketing. Sales and marketing expense increased $830, or 2%, to $34,935 for the year ended December 31, 2024, as compared to the year ended December 31, 2023. The change year-over-year was primarily driven by an increase in advertising and other costs.

Depreciation and Amortization. Depreciation and amortization expense increased $6,838, or 8%, to $94,989 for the year ended December 31, 2024, as compared to the year ended December 31, 2023. The increase was primarily due to the impact of a change in the composition of our aircraft fleet that resulted in an increased number of owned aircraft and aircraft under finance leases. For the years ended December 31, 2024 and 2023, there were an average of 36 and 33 owned aircraft and 15 and 12 aircraft under finance leases, respectively.

Ground Handling. Ground handling expense increased $4,612, or 12%, to $42,118 for the year ended December 31, 2024, as compared to the year ended December 31, 2023. The year-over-year increase was primarily the result of an 8% increase in Passenger segment departures, due to our expanding operations, as well as rate increases due to market pressures.

Landing Fees and Airport Rent. Landing fees and airport rent increased $9,934, or 20%, to $59,549 for the year ended December 31, 2024, as compared to the year ended December 31, 2023. The increase was a result of airports exhausting their remaining CARES Act funding, which increased rates. The increase was also impacted by rate increases due to market pressures and the 8% increase in Passenger segment departures as a result of our expanding operations.

Other Operating, net. Other operating, net expense decreased $2,108, or 2%, to $105,457 for the year ended December 31, 2024, as compared to the year ended December 31, 2023. This was primarily the result of our engine and part sales programs, mostly offset by an increase in operations.

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Non-operating Income (Expense)

Interest Income. Interest income decreased by $2,347, or 23%, to $7,833 for the year ended December 31, 2024, as compared to the year ended December 31, 2023. The decrease was primarily due to the reduction in the Company's average investment balance year-over-year.

Interest Expense. Interest expense increased $1,666, or 4%, to $44,300 for the year ended December 31, 2024, as compared to the year ended December 31, 2023. The increase was due to the change in our aircraft fleet that resulted in an increase of aircraft under finance leases, owned aircraft that were financed with debt proceeds, and a loss related to the partial refinancing of the term loan credit facility. For more information on the Company's Debt, see Note 7 to the Consolidated Financial Statements included in Part II, Item 8 of this Annual Report.

Other, net. Other, net changed by $942 to a net benefit of $55 for the year ended December 31, 2024, as compared to the year ended December 31, 2023. The change is primarily a result of secondary offering costs incurred during the year ended December 31, 2023.

Income Tax Expense. Our effective tax rate increased by 0.7% to 24.0% for the year ended December 31, 2024, as compared to 23.3% for the year ended December 31, 2023. The increase in the effective tax rate was due to the impact of permanent stock compensation items. For more information on the Company's tax rate, see Note13 to the Consolidated Financial Statements included in Part II, Item 8, "Financial Statements" of this Annual Report.

Segment Information

For the Years Ended December 31, 2024 and 2023:

	Year Ended December 31, 2024									Year Ended December 31, 2023
	Passenger			Cargo			Total			Passenger			Cargo			Total
Operating Revenues	$	968,565		$	107,174		$	1,075,739		$	949,885		$	99,735		$	1,049,620
Operating Expenses:
Aircraft Fuel	237,108			52			237,160			246,600			69			246,669
Salaries, Wages, and Benefits	255,887			70,888			326,775			225,744			69,896			295,640
Aircraft Rent	—			—			—			2,281			—			2,281
Maintenance	54,619			14,151			68,770			46,211			14,377			60,588
Sales and Marketing	34,935			—			34,935			34,105			—			34,105
Depreciation and Amortization	94,971			18			94,989			88,098			53			88,151
Ground Handling	42,102			16			42,118			37,506			—			37,506
Landing Fees and Airport Rent	58,951			598			59,549			49,175			440			49,615
Other Operating, net	85,199			20,258			105,457			87,293			20,272			107,565
Total Operating Expenses	863,772			105,981			969,753			817,013			105,107			922,120
Operating Income (Loss)	$	104,793		$	1,193		$	105,986		$	132,872		$	(5,372)		$	127,500
Operating Margin %	10.8		%	1.1		%	9.9		%	14.0		%	(5.4)		%	12.1		%

Passenger. Passenger operating income decreased by $28,079 to $104,793 for the year ended December 31, 2024 as compared to the year ended December 31, 2023. Operating Margin Percentage decreased by 3.2 percentage points, to 10.8%, as compared to the year ended December 31, 2023. The year-over-year decreases in Passenger Operating Income and Operating Margin Percentage were primarily driven by a 9% decrease in total fare per passenger as a result of increased capacity across the industry, partially offset by a 8% increase in Passenger segment departures. Operating Income and Operating Margin Percentage were

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further impacted by increased expenses as a result of contractual rate increases for our pilots, an increase in heavy maintenance and landing gear events, and rate increases for Landing Fees and Airport Rent; partially offset by an 11% decrease in the average fuel cost per gallon. For more information on the changes in the components of Operating Income for the Passenger segment, refer to the Results of Operations discussion above.

Cargo. Cargo Operating Income increased by $6,565 to $1,193 for the year ended December 31, 2024, as compared to the year ended December 31, 2023. Operating Margin Percentage increased by 6.5 percentage points over the same periods. The changes in both Operating Income and Operating Margin Percentage were driven by rate escalations attributable to executing the A&R ATSA and scheduling efficiency improvements between our segments, which partially offset the contractual rate increases for our pilots and resulted in materially consistent year-over-year Operating Expenses. For more information on the components of Operating Income for the Cargo segment, refer to the Results of Operations discussion above.

Non-GAAP Financial Measures

We sometimes use information that is derived from the Consolidated Financial Statements, but that is not presented in accordance with GAAP. We believe these non-GAAP measures provide a meaningful comparison of our results to others in the airline industry and our prior year results. Investors should consider these non-GAAP financial measures in addition to, and not as a substitute for, our financial performance measures prepared in accordance with GAAP. Further, our non-GAAP information may be different from the non-GAAP information provided by other companies. We believe certain charges included in our operating expenses on a GAAP basis make it difficult to compare our current period results to prior periods as well as future periods and guidance. The tables below show a reconciliation of non-GAAP financial measures used in this Annual Report to the most directly comparable GAAP financial measures.

Adjusted Operating Income, Adjusted Operating Income Margin, Adjusted Net Income and Adjusted EBITDA

Adjusted Operating Income, Adjusted Operating Income Margin, Adjusted Net Income, and Adjusted EBITDA are non-GAAP measures included as supplemental disclosure because we believe they are useful indicators of our operating performance. Derivations of Operating Income and Net Income are well-recognized performance measurements in the airline industry that are frequently used by our management, as well as by investors, securities analysts and other interested parties in comparing the operating performance of companies in our industry.

The measures described above have limitations as analytical tools. Some of the limitations applicable to these measures include: they do not reflect the impact of certain cash and non-cash charges resulting from matters we consider not to be indicative of our ongoing operations; and other companies in our industry may calculate these non-GAAP measures differently than we do, limiting each measure’s usefulness as a comparative measure. Because of these limitations, the following non-GAAP measures should not be considered in isolation or as a substitute for performance measures calculated in accordance with GAAP and may not be the same as or comparable to similarly titled measures presented by other companies due to the possible differences in the method of calculation and in the items being adjusted.

For the foregoing reasons, Adjusted Operating Income, Adjusted Operating Income Margin, Adjusted Net Income and Adjusted EBITDA have significant limitations which affect their use as indicators of our profitability. Accordingly, readers are cautioned not to place undue reliance on this information.

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The following table presents the reconciliation of Operating Income to Adjusted Operating Income, and Adjusted Operating Income Margin for the periods presented below.

	Year Ended December 31,
	2024			2023
Adjusted Operating Income Margin Reconciliation:
Operating Revenue	$	1,075,739		$	1,049,620
Operating Income	105,986			127,500
Stock Compensation Expense	6,020			9,274
Adjusted Operating Income	$	112,006		$	136,774
Operating Income Margin	9.9		%	12.1		%
Adjusted Operating Income Margin	10.4		%	13.0		%

The following table presents the reconciliation of Net Income to Adjusted Net Income for the periods presented below.

	Year Ended December 31,
	2024		2023
Adjusted Net Income Reconciliation:
Net Income	$	52,903	$	72,181
Stock Compensation Expense	6,020		9,274
Loss on Debt Refinancing	551		—
Secondary Offering Costs	—		1,128
TRA Adjustment (a)	—		(331)
Income Tax Effect of Adjusting Items, net (b)	(1,511)		(2,392)
Adjusted Net Income	$	57,963	$	79,860

__________________________

(a)	This represents the adjustment to the TRA for the period, which is recorded in Non-operating Income (Expense), net.
(b)	The tax effect of adjusting items, net is calculated at the Company’s statutory rate for the applicable period. The TRA adjustment is not tax deductible and therefore not included in this adjustment.

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The following table presents the reconciliation of Net Income to Adjusted EBITDA for the periods presented below.

	Year Ended December 31,
	2024		2023
Adjusted EBITDA Reconciliation:
Net Income	$	52,903	$	72,181
Stock Compensation Expense	6,020		9,274
Secondary Offering Costs	—		1,128
TRA Adjustment (a)	—		(331)
Interest Income	(7,833)		(10,180)
Interest Expense	44,300		42,634
Provision for Income Taxes	16,671		21,978
Depreciation and Amortization	94,989		88,151
Adjusted EBITDA	$	207,050	$	224,835

__________________________

(a)	This represents the adjustment to the TRA for the period, which is recorded in Non-operating Income (Expense), net.

CASM and Adjusted CASM

CASM is a key airline cost metric defined as operating expenses divided by total available seat miles. Adjusted CASM is a metric that uses a non-GAAP measure derived from CASM by excluding fuel costs, costs related to our Cargo operations, depreciation and amortization recognized on certain assets that generate lease income, stock-based compensation, certain commissions and other costs of selling our vacation products from this measure as these costs are unrelated to our airline operations and improve comparability to our peers. Adjusted CASM is an important measure used by management and by our Board of Directors in assessing quarterly and annual cost performance. Adjusted CASM is commonly used by industry analysts and we believe it is an important metric by which they compare our airline to others in the industry, although other airlines may exclude certain other costs in their calculation of Adjusted CASM. The measure is also the subject of frequent questions from investors.

Adjusted CASM excludes fuel costs. By excluding volatile fuel expenses that are outside of our control from our unit metrics, we believe that we have better visibility into the results of operations and our non-fuel cost initiatives. Our industry is highly competitive and is characterized by high fixed costs, so even a small reduction in non-fuel operating costs can lead to a significant improvement in operating results. In addition, we believe that all domestic carriers are similarly impacted by changes in jet fuel costs over the long run, so it is important for management and investors to understand the impact and trends in company-specific cost drivers, such as labor rates, aircraft costs and maintenance costs, and productivity, which are more controllable by management.

We have excluded costs related to the Cargo operations, as well as depreciation and amortization recognized on certain assets that generate lease income as these operations do not create ASMs. The Cargo expenses in the reconciliation below are different from the total operating expenses for our Cargo segment in the “Segment Information” table presented above, due to several items that are included in the Cargo segment, but have been captured in other line items used in the Adjusted CASM calculation. The Company has entered into certain transactions where it serves as a lessor. As of December 31, 2024, we leased or subleased six aircraft. Depreciation and Amortization expense on these aircraft materially began during the three months ended June 30, 2023. Adjusted CASM further excludes special items and other adjustments, as defined in the relevant reporting period, that are not representative of the ongoing costs necessary to our airline operations and may improve comparability between periods. We also exclude stock compensation expense when computing Adjusted CASM. Our compensation strategy includes the use of stock-based compensation to attract and retain employees and executives and is principally aimed at aligning their interests with those of our stockholders and long-term employee retention, rather than to motivate or reward operational performance for any period. Thus, stock-based compensation expense varies for reasons that are generally unrelated to operational decisions and performance in any period.

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As derivations of Adjusted CASM are not determined in accordance with GAAP, such measures are susceptible to varying calculations and not all companies calculate the measures in the same manner. As a result, derivations of Adjusted CASM as presented may not be directly comparable to similarly titled measures presented by other companies. Adjusted CASM should not be considered in isolation or as a replacement for CASM. For the aforementioned reasons, Adjusted CASM has significant limitations which affect its use as an indicator of our profitability. Accordingly, readers are cautioned not to place undue reliance on this information.

The following tables present the reconciliation of CASM to Adjusted CASM.

	Year Ended December 31,
	2024			2023
	Operating<br>Expenses		Per ASM<br>(in cents)	Operating<br>Expenses		Per ASM <br>(in cents)
CASM	$	969,753	12.01	$	922,120	12.43
Less:
Aircraft Fuel	237,160		2.94	246,669		3.33
Stock Compensation Expense	6,020		0.07	9,274		0.12
Cargo expenses, not already adjusted above	104,634		1.30	102,995		1.39
Sun Country Vacations	1,257		0.01	1,138		0.01
Leased Aircraft, Depreciation and Amortization Expense (a)	8,059		0.10	6,669		0.09
Adjusted CASM	$	612,623	7.59	$	555,375	7.49
ASM (thousands)	8,071,949			7,416,189

__________________________

(a)	Includes both the Company's Owned Aircraft Held for Operating Lease as well as subleased aircraft. These aircraft are leased to unaffiliated airlines.

Liquidity and Capital Resources

The airline business is capital intensive. Our ability to successfully execute our business strategy is largely dependent on the continued availability of capital with attractive terms and maintaining sufficient liquidity. We have historically funded our operations and capital expenditures primarily through cash from operations, proceeds from stockholders’ capital contributions, the issuance of promissory notes, and debt financing.

Our primary sources of liquidity as of December 31, 2024 included our existing cash and cash equivalents of $83,219 and short-term investments of $104,053, our expected cash generated from operations, and the $24,743 of available funds from the Revolving Credit Facility. We invest cash and cash equivalents in highly liquid securities with strong credit ratings. We classify our investments as current assets because of their highly liquid nature and availability to be converted into cash to fund current operations. Given the significant portion of our portfolio held in cash and cash equivalents and the high credit quality of our debt security investments, we do not anticipate fluctuations in the aggregate fair value of our investments to have a material impact on our liquidity or capital position.

In addition, we had restricted cash of $17,252 as of December 31, 2024, which generally consists of cash received as prepayment for chartered flights that is maintained in separate escrow accounts in accordance with DOT regulations requiring that Charter revenue receipts received prior to the date of transportation are maintained in a separate third-party escrow account. The restrictions are released once the charter transportation is provided.

Our primary uses of liquidity are for operating expenses, capital expenditures, lease rentals and maintenance reserve deposits, purchase options on finance leases we are reasonably certain to exercise, debt repayments, working capital requirements, TRA payments to the pre-IPO stockholders (the “TRA holders”), and other general corporate purposes. Our single largest capital expenditure requirement relates to the acquisition of aircraft. We

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do not maintain an aircraft order book; instead, we enter into aircraft transactions on an opportunistic basis based on market conditions, our prevailing level of liquidity and capital market availability. As a result, we are not locked into large future capital expenditures. We have historically acquired aircraft through operating leases, finance leases, and debt. Our management team retains broad discretion to allocate liquidity.

We believe that our unrestricted cash and cash equivalents, short-term investments, and availability under our Revolving Credit Facility, combined with expected future cash flows from operations, will be sufficient to fund our operations and meet our debt payment obligations for at least the next twelve months. However, we cannot predict what the effect on our business and financial position might be from a change in the competitive environment in which we operate or from events beyond our control, such as volatile fuel prices, economic conditions, pandemics, weather-related disruptions, the impact of airline bankruptcies, restructurings or consolidations, U.S. military actions, geopolitical factors, regulations, or acts of terrorism.

Aircraft – As of December 31, 2024, we had a fleet of 63 Boeing 737-NG aircraft. This includes 45 aircraft in the passenger fleet and 12 cargo operated aircraft through the A&R ATSA and six aircraft that are currently on lease to unaffiliated airlines. For more information on our fleet and related lease payments, see Note 5 and Note 8 to the Consolidated Financial Statements included in Part II, Item 8 of this Annual Report.

Maintenance Deposits - In addition to funding the acquisition of aircraft, we are required by certain of our aircraft lessors to fund cash reserves in advance of scheduled maintenance to act as collateral for the benefit of lessors. Qualifying payments that are expected to be recovered from lessors are recorded as Lessor Maintenance Deposits on our Consolidated Balance Sheets. As of December 31, 2024, we had $54,145 in total Lessor Maintenance Deposits. As of December 31, 2024, all maintenance deposits are estimated to be recoverable either through reimbursable maintenance events or through application towards the purchase of the aircraft.

Credit Facilities - We use our Credit Facilities to provide liquidity support for general corporate purposes and to finance the acquisition of aircraft. As of December 31, 2024, we had $24,743 of the $25,000 Revolving Credit Facility available due to $257 being pledged to support a letter of credit, and no balance drawn. We were in compliance with all covenants as of December 31, 2024 and 2023.

Debt - At our discretion, we obtain debt financing in order to purchase, or refinance aircraft. In December 2024, the Company reissued Class C trust certificates from the 2019-1 EETC, which had previously been repaid, in an aggregate face amount of $60,000 and concurrently applied the proceeds to repay a portion of the term loan credit facility.

For more information on our credit facilities or debt, see Note 7 to the Consolidated Financial Statements included in Part II, Item 8 of this Annual Report.

TRA Liability - During the years ended December 31, 2024 and 2023, we made payments of $3,350 and $2,425 to the TRA holders, respectively, which includes certain members of the Company's management and certain members of the Company's Board of Directors. The total TRA liability balance as of December 31, 2024 was $97,694, of which $10,325 was current. The TRA liability is an estimate and actual amounts payable under the TRA could differ from this estimate. Payments will be made in future periods as Pre-IPO Tax Attributes are utilized. If the Company does not generate sufficient taxable income in the aggregate over the term of the TRA to utilize the tax benefits, then it would not be required to make the related TRA payments. For more information on the TRA liability, see Note 13 to the Consolidated Financial Statements included in Part II, Item 8 of this Annual Report.

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Liquidity and Financial Condition Indicators

The table below presents the major indicators of financial condition and liquidity:

	December 31,
	2024		2023
Cash and Cash Equivalents	$	83,219	$	46,279
Available-for-Sale Securities	97,636		134,240
Amount Available Under Revolving Credit Facility	24,743		24,650
Total Liquidity	$	205,598	$	205,169
	December 31,
	2024		2023
Total Debt, net	$	327,122	$	401,645
Finance Lease Obligations	271,262		277,302
Operating Lease Obligations	20,650		18,830
Total Debt, net and Lease Obligations	619,034		697,777
Stockholders' Equity	570,373		514,403
Total Invested Capital	$	1,189,407	$	1,212,180
Debt-to-Capital	0.52		0.58

Sources and Uses of Liquidity

	Year Ended December 31,				%<br>Change
	2024		2023
Total Operating Activities	$	164,862	$	174,120	(5)	%
Investing Activities:
Purchases of Property & Equipment	(47,332)		(218,160)		(78)	%
Proceeds from the Sale of Property & Equipment	17,166		4,953		247	%
Purchases of Investments	(92,404)		(95,535)		(3)	%
Proceeds from the Maturities of Investments	130,125		137,220		(5)	%
Other, net	842		291		189	%
Total Investing Activities	8,397		(171,231)		105	%
Financing Activities:
Common Stock Repurchases	(12,134)		(68,585)		(82)	%
Proceeds from Borrowings	70,000		119,200		(41)	%
Repayment of Finance Lease Obligations	(45,942)		(21,883)		110	%
Repayment of Borrowings	(145,518)		(69,276)		110	%
Other, net	(2,874)		(1,593)		80	%
Total Financing Activities	(136,468)		(42,137)		224	%
Net Increase (Decrease) in Cash	$	36,791	$	(39,248)	194	%

__________________________

“Cash” consists of Cash, Cash Equivalents and Restricted Cash

“NM” stands for not meaningful

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Operating Cash Flow Activities

Operating activities in the years ended December 31, 2024 and 2023 provided $164,862 and $174,120 of cash, respectively. During the years ended December 31, 2024 and 2023, Net Income was $52,903 and $72,181, respectively. For more information on the components of Net Income for the years ended December 31, 2024 and 2023, refer to the Consolidated Results of Operations discussion above.

Our operating cash flow is primarily impacted by the following factors:

Seasonality of Advance Ticket Sales. We sell tickets for air travel in advance of the customer's travel date. When we receive a cash payment at the time of sale, we record the cash received on advance sales as deferred revenue in Air Traffic Liabilities. Air Traffic Liabilities typically increase during the fall and early winter months as advanced ticket sales grow prior to the late winter and spring peak travel season and decrease during the summer months. Air Traffic liabilities were materially consistent year-over-year.

Aircraft Fuel. Aircraft Fuel expense represented approximately 24% and 27% of our total operating expense for the years ended December 31, 2024 and 2023, respectively. The market price for jet fuel is volatile, which can impact the comparability of our periodic cash flows from operations. Fuel cost per gallon decreased by 11% year-over-year due to the impact of global geopolitical events on the price of fuel during the year ended December 31, 2023. Fuel consumption has increased by 8% year-over-year, as a result of the increase in fleet size and total operations. We expect volatility in Aircraft Fuel prices per gallon to continue for the foreseeable future due to the impact of market conditions and global geopolitical events.

Investing Cash Flow Activities

Capital Expenditures. Our capital expenditures were $47,332 and $218,160 for the years ended December 31, 2024 and 2023, respectively. Our capital expenditures during the year ended December 31, 2024 included the acquisition of one aircraft and other items not individually material. Our capital expenditures during the year ended December 31, 2023 primarily included the purchase of five Owned Aircraft Held for Operating Lease and one incremental aircraft for our passenger fleet.

Investments. During the years ended December 31, 2024 and 2023, our net investment activity in debt securities resulted in cash inflows of $37,721 and $41,685, respectively, due to maturities of debt securities exceeding purchases of investments. The year-over-year change is a result of a difference in timing of debt security maturities and a reduction in the Company's average investment balance year-over-year and does not represent a change in investment strategy.

Financing Cash Flow Activities

Debt. In December 2024, the Company reissued Class C trust certificates of its 2019-1 EETC, which had previously been repaid, in an aggregate face amount of $60,000 and concurrently applied all the proceeds to repay a portion of the term loan credit facility. During the year ended December 31, 2023, we executed a term loan credit facility with a face amount of $119,200 for the purpose of financing the five Owned Aircraft Held for Operating Lease. For additional information regarding these financing arrangements, see Note 7 to the Consolidated Financial Statements included in Part II, Item 8 of this Annual Report.

Finance Leases. Our repayments of finance lease obligations were $45,942 and $21,883 for the years ended December 31, 2024 and 2023, respectively. During 2024, we purchased three aircraft previously classified as finance leases, which are now unencumbered. The resulting cash outflows are recorded as payments for finance lease obligations. For the years ended December 31, 2024 and 2023, there were an average of 15 and 12 finance leases, respectively.

Common Stock Repurchases. During the year ended December 31, 2024, the Company completed open market repurchases for 755,284 shares of its Common Stock at a total cost of $11,493, or an average price of $15.22 per share. During the year ended December 31, 2024, the Company also made an excise tax payment of $641 for stock repurchases made in 2023. During the year ended December 31, 2023, the Company repurchased 4,213,975 shares of its Common Stock at a total cost of $68,585, or an average price of $16.28 per share. The repurchases were part of secondary public offerings of the Company's shares by the SCA Horus

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Stockholder, as well as open market purchases. The settlement of a $25,000 Accelerated Share Repurchase Program occurred during January 2023, upon which the Company received an additional 480,932 shares. For more information on the Company's stock repurchases, see Note 14 to the Consolidated Financial Statements included in Part II, Item 8 of this Annual Report.

Other. During the years ended December 31, 2024 and 2023, we made payments of $3,350 and $2,425 to the TRA holders, respectively, which includes certain members of the Company's management and certain members of the Company's Board of Directors. For more information on the payment of the TRA, see Note 13 of the Consolidated Financial Statements included in Part II, Item 8 of this Annual Report.

Off Balance Sheet Arrangements

Indemnities. Our aircraft, equipment and other leases and certain operating agreements typically contain provisions requiring us, as the lessee, to indemnify the other parties to those agreements, including certain of those parties’ related persons, against virtually any liabilities that might arise from the use or operation of the aircraft or such other equipment. We believe that our insurance covers most of our exposure to liabilities and related indemnities associated with the leases described above.

Pass-Through Trusts. We have equipment notes outstanding issued under the 2019-1 EETC and 2022-1 EETC. Generally, the structure of the EETC financings consists of pass-through trusts created by us to issue pass-through certificates, which represent fractional undivided interests in the respective pass-through trusts and are not obligations of Sun Country. The proceeds of the issuance of the pass-through certificates are used to purchase equipment notes which are issued by us and secured by our aircraft. The payment obligations under the equipment notes are those of Sun Country. We use these certificates to finance or refinance aircraft purchases. The obligations are listed in Note 7 to the Consolidated Financial Statements included in Part II, Item 8 of this Annual Report.

Fuel Consortia. We currently participate in fuel consortia at various airports throughout the U.S. and we expect to expand our participation with other airlines in fuel consortia and fuel committees at our airports where economically beneficial. These agreements generally include cost-sharing provisions and environmental indemnities that are generally joint and several among the participating airlines. Consortia that are governed by interline agreements are either, 1) not VIEs because they are not legal entities, or 2) are variable interest entities, but the Company is not deemed the primary beneficiary. Therefore, these agreements are not reflected on our Consolidated Balance Sheets. There are no assets or liabilities on our Balance Sheets related to these VIEs, since our participation is limited to purchasing aircraft fuel.

We have no other off-balance sheet arrangements.

Commitments and Contractual Obligations

Our long-term cash requirements under our various contractual obligations and commitments include:

•Debt. For further detail of our long-term debt and the timing of expected future payments, see Note 7 to the Consolidated Financial Statements included in Part II, Item 8, included in this Annual Report. Interest coupon payments on the Company's EETC financings are paid semi-annually. The Term Loan is repaid monthly.

•Aircraft Leases and Maintenance Reserves. For more information on our finance leases, as well as the timing of expected future lease payments, see Note 8 to the Consolidated Financial Statements included in Part II, Item 8, included in this Annual Report.

•TRA Liability. For more information on the TRA liability to be paid to the TRA holders, see Note 13 to the Consolidated Financial Statements included in Part II, Item 8, included in this Annual Report.

For additional information on the status of our union contracts, as well as our contractual obligations and commitments, refer to Note 2 and Note 15 to the Consolidated Financial Statements included in Part II, Item 8, included in this Annual Report. Except as described herein, there have been no material changes in our contractual obligations and commitments other than in the ordinary course of business since our fiscal year ended December 31, 2024.

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Critical Accounting Policies and Estimates

The preparation of financial statements in accordance with GAAP requires management to make certain estimates and assumptions that affect the reported amounts of assets and liabilities, revenues and expenses, and the disclosure of contingent assets and liabilities at the date of the financial statements. We believe our estimates and assumptions are reasonable; however, actual results could differ from those estimates.

Our significant accounting policies are described in Note 2 to the Consolidated Financial Statements in Part II, Item 8 of this Annual Report. Some of those significant accounting policies require us to make difficult, subjective, or complex judgments, or estimates. An accounting estimate is considered to be critical if it meets both of the following criteria:

i.the estimate requires assumptions about matters that are highly uncertain at the time the accounting estimate is made, and

ii.different estimates reasonably could have been used, or changes in the estimate that are reasonably likely to occur from period to period may have a material impact on the presentation of our financial condition, changes in financial condition, or results of operations.

We have identified the following critical accounting policies:

–Revenue Recognition

–Asset Impairment Analysis

Revenue Recognition

Scheduled Service, Charter, and most Ancillary revenues are recognized when the passenger flight occurs. Revenues exclude amounts collected on behalf of other parties, including transportation taxes.

We initially defer Scheduled Service ticket sales as an air traffic liability and recognize revenue when the passenger flight occurs. Unused non-refundable tickets expire at the date of scheduled travel and are recorded as revenue unless the customer notifies the Company in advance of such date that the customer will not travel. If notification is made, a travel credit is created for the face value, including ancillary fees, less applicable change fees. Revenue for change fees is deferred and recognized when the passenger travel is provided.

Travel credits may generally be redeemed toward future travel for up to 12 months after the date of the original booking. As of December 31, 2024 and 2023, the Company’s air traffic liability included $5,822 and $6,048, respectively, related to travel credits for future travel. The Company records an estimate for travel credits that will expire unused, otherwise known as breakage, in Passenger Revenue upon issuance of the travel credit. During the years ended December 31, 2024 and 2023, the Company recorded $8,455 and $10,240, respectively, of estimated travel credit breakage. A portion of travel credits will expire unused, at which time any remaining revenue is recognized.

The estimated breakage rate is primarily based on historical experience of travel credit activity and other factors that may not be indicative of future trends, such as program changes or modifications that could affect the ultimate usage patterns of tickets and travel credits. The Company continuously monitors its breakage rate assumptions and may adjust its estimated breakage rate in the future. Changes in the Company’s estimated breakage rate impact revenue recognition prospectively.

For the year ended December 31, 2024, a 10% change in the Company’s estimated travel credit breakage rate would have resulted in a change to Passenger Revenue of approximately $770.

There are no critical accounting estimates associated with Charter or Cargo revenue recognition that would materially impact the amount of revenue recognized in any specific period.

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Asset Impairment Analysis

The Company’s long-lived assets, such as Property & Equipment and Other Intangible Assets with Finite-Lives, are reviewed for impairment whenever events or changes in circumstances indicate that the carrying amount of an asset (or asset group) may not be recoverable. The Company’s long-lived assets include aircraft and associated engines, operating and finance lease assets, the Company’s customer relationship and over-market finite-lived Other Intangible Assets, and other long-lived assets. The Company reviews the current economic and operating environment to determine whether events or circumstances indicate that these assets (or asset groups) may be impaired. Such indicators include, but are not limited to: 1) significant, permanent decrease in the market price of the Company’s long-lived assets, 2) significant decrease in the projected cash flows generated from the use of its long-lived assets, 3) changes in the estimated useful life or productive capacity of the asset, 4) changes in the regulatory environment in which the Company operates, and 5) a decision to permanently remove flight equipment or other long-lived assets from operations. If such factors are identified and the Company determines that the carrying amount of the long-lived asset (or asset group) is not recoverable on an undiscounted cash flow basis, an impairment is recognized to the extent that the asset (or asset group’s) carrying amount exceeds its fair value. Fair value is determined using various valuation techniques, including discounted cash flow models, quoted market values and third-party independent appraisals, as considered necessary.

When the Company assesses its long-lived assets for impairment, it utilizes certain assumptions, including, but not limited to: 1) estimated fair value of the assets, and 2) estimated future undiscounted cash flows expected to be generated by those assets. Cash flow estimates are determined based on additional assumptions, including asset utilization, average fares, projected fuel costs and other operating costs, along with the estimated service life of the asset. Certain of these assumptions are highly volatile and could change significantly from period-to-period due to various macroeconomic and industry-specific events.

To determine whether impairment exists, the Company groups its assets based on the lowest level of identifiable cash flows. The Company operates a fleet comprised exclusively of one type of aircraft, the Boeing 737-NG. Therefore, the Company's largest asset group is its fleet of Boeing 737-NG aircraft, associated engines, as well as related finite-lived Other Intangible Assets. All of the Company’s long-lived assets are owned by, or associated with, the Passenger operating segment.

The Company has not recorded an impairment on its long-lived assets, nor did it identify any triggering events, for any of the periods presented in these Consolidated Financial Statements.

ITEM 7A. QUANTITATIVE AND QUALITATIVE DISCLOSURES ABOUT MARKET RISK

We are subject to market risks in the ordinary course of our business. These risks include commodity price risk, specifically with respect to aircraft fuel, as well as interest rate risk. The adverse effects of changes in these markets could pose a potential loss as discussed below. The sensitivity analysis provided does not consider the effects that such adverse changes may have on overall economic activity, nor does it consider additional actions we may take to mitigate our exposure to such changes. Accordingly, actual results may differ from the information provided below.

Aircraft Fuel. Unexpected pricing changes of aircraft fuel could have a material adverse effect on our business, results of operations and financial condition. For example, based on our forecasted Aircraft Fuel expense for the first quarter of 2025, we estimate that a one cent per gallon increase in the average aircraft fuel price would increase Aircraft Fuel expense by approximately $250. Aircraft Fuel expense does not include amounts where we are considered the customer's agent for procuring fuel. We had no fuel option and swap contracts in place to hedge the economic risk associated with volatile fuel prices as of December 31, 2024. We currently do not expect to enter into these types of contracts prospectively, although significant changes in market conditions could affect our decisions.

Interest Rates. We have exposure to market risk associated with changes in interest rates related to the interest expense from our variable-rate debt and our short-term investment securities. A change in market interest rates would impact interest expense under the term loan credit facility used to finance the Owned Aircraft Held for Operating Lease. In December 2024, the Company reissued Class C trust certificates from the 2019-1 EETC, which had previously been repaid, in an aggregate face amount of $60,000 and concurrently applied the

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proceeds to repay a portion of the term loan credit facility. This significantly reduced the Company's exposure to market risk associated with changes in interest rates related to our variable-rate debt. A 100 basis point increase in interest rates on the term loan would result in a corresponding increase in interest expense of approximately $331 annually. The Company also maintains a $25,000 Revolving Credit Facility with a variable interest rate that is impacted by market conditions. As of December 31, 2024, the Company had $24,743 of financing available through the Revolving Credit Facility, as $257 had been pledged to support a letter of credit. As of December 31, 2024, no amounts on the Revolving Credit Facility had been drawn.

Our short-term investment securities are primarily comprised of fixed-rate debt investments. An increase in market interest rates decreases the market value of fixed-rate investments. Conversely, a decrease in market interest rates increases the market value. The fair market value of our short-term investments with exposure to interest rate risk was $97,636 as of December 31, 2024. The Company limits its investments to investment grade quality securities. Given these factors and that a significant portion of our portfolio is held in cash and cash equivalents, we do not anticipate fluctuations in the aggregate fair value of our financial assets to have a material impact on our liquidity or capital position.

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ITEM 8: FINANCIAL STATEMENTS AND SUPPLEMENTARY DATA

Report of Independent Registered Public Accounting Firm (ID #185)		72
Consolidated Financial Statements
Consolidated Balance Sheets		74
Consolidated Statements of Operations		76
Consolidated Statements of Comprehensive Income		77
Consolidated Statements of Changes in Stockholders' Equity		78
Consolidated Statements of Cash Flows		79
Notes to the Consolidated Financial Statements
Note 1	Company Background	80
Note 2	Basis of Presentation and Summary of Significant Accounting Policies	80
Note 3	Revenue	89
Note 4	Earnings per Share	92
Note 5	Aircraft	92
Note 6	Goodwill and Other Intangible Assets	94
Note 7	Debt	95
Note 8	Leases	97
Note 9	Stock-Based Compensation	100
Note 10	Defined Contribution 401(k) Plan	103
Note 11	Investments	103
Note 12	Fair Value Measurements	103
Note 13	Income Taxes	105
Note 14	Stockholders' Equity	107
Note 15	Commitments and Contingencies	108
Note 16	Operating Segments	108
Note 17	Parent Company Financial Statements	111
Note 18	Subsequent Events	113

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Report of Independent Registered Public Accounting Firm

To the Stockholders and Board of Directors

Sun Country Airlines Holdings, Inc.:

Opinions on the Consolidated Financial Statements and Internal Control Over Financial Reporting

We have audited the accompanying consolidated balance sheets of Sun Country Airlines Holdings, Inc. and subsidiaries (the Company) as of December 31, 2024 and 2023, the related consolidated statements of operations, comprehensive income, changes in stockholders’ equity, and cash flows for each of the years in the three-year period ended December 31, 2024, and the related notes (collectively, the consolidated financial statements). We also have audited the Company’s internal control over financial reporting as of December 31, 2024, based on criteria established in Internal Control – Integrated Framework (2013) issued by the Committee of Sponsoring Organizations of the Treadway Commission.

In our opinion, the consolidated financial statements referred to above present fairly, in all material respects, the financial position of the Company as of December 31, 2024 and 2023, and the results of its operations and its cash flows for each of the years in the three-year period ended December 31, 2024, in conformity with U.S. generally accepted accounting principles. Also in our opinion, the Company maintained, in all material respects, effective internal control over financial reporting as of December 31, 2024 based on criteria established in Internal Control – Integrated Framework (2013) issued by the Committee of Sponsoring Organizations of the Treadway Commission.

Basis for Opinions

The Company’s management is responsible for these consolidated financial statements, for maintaining effective internal control over financial reporting, and for its assessment of the effectiveness of internal control over financial reporting, included in the accompanying Management's Annual Report on Internal Controls Over Financial Reporting. Our responsibility is to express an opinion on the Company’s consolidated financial statements and an opinion on the Company’s internal control over financial reporting based on our audits. We are a public accounting firm registered with the Public Company Accounting Oversight Board (United States) (PCAOB) and are required to be independent with respect to the Company in accordance with the U.S. federal securities laws and the applicable rules and regulations of the Securities and Exchange Commission and the PCAOB.

We conducted our audits in accordance with the standards of the PCAOB. Those standards require that we plan and perform the audits to obtain reasonable assurance about whether the consolidated financial statements are free of material misstatement, whether due to error or fraud, and whether effective internal control over financial reporting was maintained in all material respects.

Our audits of the consolidated financial statements included performing procedures to assess the risks of material misstatement of the consolidated financial statements, whether due to error or fraud, and performing procedures that respond to those risks. Such procedures included examining, on a test basis, evidence regarding the amounts and disclosures in the consolidated financial statements. Our audits also included evaluating the accounting principles used and significant estimates made by management, as well as evaluating the overall presentation of the consolidated financial statements. Our audit of internal control over financial reporting included obtaining an understanding of internal control over financial reporting, assessing the risk that a material weakness exists, and testing and evaluating the design and operating effectiveness of internal control based on the assessed risk. Our audits also included performing such other procedures as we considered necessary in the circumstances. We believe that our audits provide a reasonable basis for our opinions.

Definition and Limitations of Internal Control Over Financial Reporting

A company’s internal control over financial reporting is a process designed to provide reasonable assurance regarding the reliability of financial reporting and the preparation of financial statements for external purposes in accordance with generally accepted accounting principles. A company’s internal control over financial reporting includes those policies and procedures that (1) pertain to the maintenance of records that, in reasonable detail, accurately and fairly reflect the transactions and dispositions of the assets of the company; (2) provide

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reasonable assurance that transactions are recorded as necessary to permit preparation of financial statements in accordance with generally accepted accounting principles, and that receipts and expenditures of the company are being made only in accordance with authorizations of management and directors of the company; and (3) provide reasonable assurance regarding prevention or timely detection of unauthorized acquisition, use, or disposition of the company’s assets that could have a material effect on the financial statements.

Because of its inherent limitations, internal control over financial reporting may not prevent or detect misstatements. Also, projections of any evaluation of effectiveness to future periods are subject to the risk that controls may become inadequate because of changes in conditions, or that the degree of compliance with the policies or procedures may deteriorate.

Critical Audit Matter

The critical audit matter communicated below is a matter arising from the current period audit of the consolidated financial statements that was communicated or required to be communicated to the audit committee and that: (1) relates to accounts or disclosures that are material to the consolidated financial statements and (2) involved our especially challenging, subjective, or complex judgments. The communication of a critical audit matter does not alter in any way our opinion on the consolidated financial statements, taken as a whole, and we are not, by communicating the critical audit matter below, providing a separate opinion on the critical audit matter or on the accounts or disclosures to which it relates.

Sufficiency of audit evidence over aircraft transactions

As discussed in Note 5to the consolidated financial statements, the Company operates 51 passenger aircraft, including owned and leased aircraft. During the year ended December 31, 2024, the Company acquired one incremental owned aircraft, took control of two aircraft through finance lease arrangements, executed the purchase option on three aircraft that were previously under finance lease arrangements and accepted delivery of one aircraft that was previously leased to an unaffiliated airline. As of December 31, 2024, the Company had recorded total aircraft and flight equipment of $775,210 thousand, aircraft and flight equipment held for operating lease of $124,383 thousand, and finance lease assets of $309,877 thousand.

We identified the evaluation of the sufficiency of audit evidence over the Company’s aircraft purchase and lease transactions as a critical audit matter. The volume and magnitude of the transactions facilitating the revenue generating activities of the Company required subjective auditor judgement in determining the nature and extent of procedures to perform and in evaluating those procedures.

The following are the primary procedures we performed to address this critical audit matter. We applied subjective auditor judgment to determine the nature and extent of procedures to be performed over aircraft purchase and lease transactions. We evaluated the design and tested the operating effectiveness of certain internal controls over the Company’s identification and recording of aircraft purchase and lease transactions and related financial statement disclosures. We inquired with management, including general counsel, regarding executed aircraft transactions, read meeting minutes of the Company’s board of directors and compared the Company’s records of its existing fleet of aircraft to third-party external information. For each aircraft transaction, we evaluated the amounts recorded by the Company and the related presentation by comparing such amounts to relevant underlying documentation, including purchase agreements, cash settlement, and contractual lease agreements. We evaluated the sufficiency of the audit evidence obtained by assessing the results of procedures performed including the appropriateness of the nature and extent of such evidence.

/s/ KPMG LLP

We have served as the Company’s auditor since 2018.

Minneapolis, Minnesota

February 12, 2025

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SUN COUNTRY AIRLINES HOLDINGS, INC.

CONSOLIDATED BALANCE SHEETS

(Dollars in thousands, except per share and share amounts)

	December 31,
	2024		2023
ASSETS
Current Assets:
Cash and Cash Equivalents	$	83,219	$	46,279
Restricted Cash	17,252		17,401
Investments	104,053		141,127
Accounts Receivable, net of an allowance for credit losses of $617 and $17, respectively	35,296		38,166
Short-term Lessor Maintenance Deposits	521		1,046
Inventory, net of a reserve for obsolescence of $784 and $977, respectively	10,467		7,793
Prepaid Expenses	13,837		15,823
Other Current Assets	1,939		3,716
Total Current Assets	266,584		271,351
Property & Equipment, net:
Aircraft and Flight Equipment	775,210		685,559
Aircraft and Flight Equipment Held for Operating Lease	124,383		154,185
Ground Equipment and Leasehold Improvements	46,550		39,847
Computer Hardware and Software	22,436		17,875
Finance Lease Assets	309,877		304,384
Rotable Parts	26,626		19,848
Total Property & Equipment	1,305,082		1,221,698
Accumulated Depreciation & Amortization	(334,993)		(252,717)
Total Property & Equipment, net	970,089		968,981
Other Assets:
Goodwill	222,223		222,223
Other Intangible Assets, net of accumulated amortization of $29,903 and $24,190, respectively	77,838		83,551
Operating Lease Right-of-use Assets	16,896		14,917
Aircraft Deposits	7,925		9,564
Long-term Lessor Maintenance Deposits	53,624		44,675
Other Assets	14,998		8,365
Total Other Assets	393,504		383,295
Total Assets	$	1,630,177	$	1,623,627

See accompanying Notes to Consolidated Financial Statements

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SUN COUNTRY AIRLINES HOLDINGS, INC.

CONSOLIDATED BALANCE SHEETS

(Dollars in thousands, except per share and share amounts)

	December 31,
	2024		2023
LIABILITIES AND STOCKHOLDERS' EQUITY
Current Liabilities:
Accounts Payable	$	56,034	$	59,011
Accrued Salaries, Wages, and Benefits	38,327		33,305
Accrued Transportation Taxes	20,534		18,097
Air Traffic Liabilities	160,686		157,996
Finance Lease Obligations	20,175		44,756
Loyalty Program Liabilities	10,121		9,898
Operating Lease Obligations	3,281		2,219
Current Maturities of Long-term Debt, net	87,579		74,177
Income Tax Receivable Agreement Liability	10,325		3,250
Other Current Liabilities	15,228		15,873
Total Current Liabilities	422,290		418,582
Long-term Liabilities:
Finance Lease Obligations	251,087		232,546
Loyalty Program Liabilities	4,480		3,839
Operating Lease Obligations	17,369		16,611
Long-term Debt, net	239,543		327,468
Deferred Tax Liability	23,566		9,148
Income Tax Receivable Agreement Liability	87,369		97,794
Other Long-term Liabilities	14,100		3,236
Total Long-term Liabilities	637,514		690,642
Total Liabilities	1,059,804		1,109,224
Commitments and Contingencies (Note 15)
Stockholders' Equity:
Common Stock with $0.01 par value, 995,000,000 shares authorized, 59,500,970 and 58,878,723 issued and 53,157,964 and 53,291,001 outstanding at December 31, 2024 and 2023, respectively	595		589
Preferred Stock with $0.01 par value, 5,000,000 shares authorized, no shares issued and outstanding at December 31, 2024 and 2023, respectively	—		—
Treasury Stock, at cost, 6,343,006 and 5,587,722 shares held at December 31, 2024 and 2023, respectively	(105,866)		(94,341)
Additional Paid-In Capital	528,604		513,988
Retained Earnings	147,132		94,229
Accumulated Other Comprehensive Loss	(92)		(62)
Total Stockholders' Equity	570,373		514,403
Total Liabilities and Stockholders' Equity	$	1,630,177	$	1,623,627

See accompanying Notes to Consolidated Financial Statements

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SUN COUNTRY AIRLINES HOLDINGS, INC.

CONSOLIDATED STATEMENTS OF OPERATIONS

(Dollars in thousands, except per share and share amounts)

	Year Ended December 31,
	2024		2023		2022
Operating Revenues:
Passenger	$	914,087	$	920,123	$	792,433
Cargo	107,174		99,735		90,350
Other	54,478		29,762		11,661
Total Operating Revenue	1,075,739		1,049,620		894,444
Operating Expenses:
Aircraft Fuel	237,160		246,669		268,363
Salaries, Wages, and Benefits	326,775		295,640		245,855
Aircraft Rent	—		2,281		8,768
Maintenance	68,770		60,588		46,604
Sales and Marketing	34,935		34,105		31,053
Depreciation and Amortization	94,989		88,151		67,641
Ground Handling	42,118		37,506		33,816
Landing Fees and Airport Rent	59,549		49,615		45,658
Other Operating, net	105,457		107,565		90,978
Total Operating Expenses	969,753		922,120		838,736
Operating Income	105,986		127,500		55,708
Non-operating Income (Expense), net:
Interest Income	7,833		10,180		4,527
Interest Expense	(44,300)		(42,634)		(31,018)
Other, net	55		(887)		(5,235)
Total Non-operating Expense, net	(36,412)		(33,341)		(31,726)
Income before Income Tax	69,574		94,159		23,982
Income Tax Expense	16,671		21,978		6,306
Net Income	$	52,903	$	72,181	$	17,676
Net Income per share to common stockholders:
Basic	$	1.00	$	1.30	$	0.31
Diluted	$	0.96	$	1.23	$	0.29
Shares used for computation:
Basic	52,908,322		55,507,144		57,951,955
Diluted	55,055,897		58,524,652		61,046,595

See accompanying Notes to Consolidated Financial Statements

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SUN COUNTRY AIRLINES HOLDINGS, INC.

CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME

(Dollars in thousands)

	Year Ended December 31,
	2024		2023		2022
Net Income	$	52,903	$	72,181	$	17,676
Other Comprehensive (Loss) Income:
Net unrealized (losses) gains on Available-for-Sale securities, net of deferred tax (benefit) expense of $(8), $222, and $(241), respectively	(30)		745		(807)
Other Comprehensive (Loss) Income	(30)		745		(807)
Comprehensive Income	$	52,873	$	72,926	$	16,869

See accompanying Notes to Consolidated Financial Statements

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SUN COUNTRY AIRLINES HOLDINGS, INC.

CONSOLIDATED STATEMENTS OF CHANGES IN STOCKHOLDERS’ EQUITY

(Dollars in thousands, except share amounts)

	Warrants		Common Stock					Treasury Stock				Additional Paid-In Capital		Retained<br>Earnings		Accumulated Other Comprehensive (Loss) Income		Total
		Shares		Amount			Shares		Amount
December 31, 2021	1,643,660		57,872,452		$	579		—		$	—	$	485,638	$	4,372	$	—	$	490,589
Stock issued for Stock-Based Awards	—		345,195		3			—		—		1,983		—		—		1,986
Net Stock Settlement of Stock-Based Awards	—		—		—			1,823		(52)		—		—		—		(52)
Common Stock Repurchases	—		—		—			890,586		(17,553)		(7,501)		—		—		(25,054)
Net Income	—		—		—			—		—		—		17,676		—		17,676
Amazon Warrants	758,608		—		—			—		—		5,600		—		—		5,600
Stock-based Compensation	—		—		—			—		—		2,774		—		—		2,774
Other Comprehensive Loss	—		—		—			—		—		—		—		(807)		(807)
December 31, 2022	2,402,268		58,217,647		$	582		892,409		$	(17,605)	$	488,494	$	22,048	$	(807)	$	492,712
Stock issued for Stock-Based Awards	—		661,076		7			—		—		2,653		—		—		2,660
Net Stock Settlement of Stock-Based Awards	—		—		—			406		(8)		—		—		—		(8)
Common Stock Repurchases and Excise Tax	—		—		—			4,694,907		(76,728)		7,501		—		—		(69,227)
Net Income	—		—		—			—		—		—		72,181		—		72,181
Amazon Warrants	821,825		—		—			—		—		6,066		—		—		6,066
Stock-based Compensation	—		—		—			—		—		9,274		—		—		9,274
Other Comprehensive Income	—		—		—			—		—		—		—		745		745
December 31, 2023	3,224,093		58,878,723		$	589		5,587,722		$	(94,341)	$	513,988	$	94,229	$	(62)	$	514,403
Stock issued for Stock-Based Awards	—		622,247		6			—		—		2,063		—		—		2,069
Common Stock Repurchases and Excise Tax	—		—		—			755,284		(11,525)		—		—		—		(11,525)
Net Income	—		—		—			—		—		—		52,903		—		52,903
Amazon Warrants	885,042		—		—			—		—		6,533		—		—		6,533
Stock-based Compensation	—		—		—			—		—		6,020		—		—		6,020
Other Comprehensive Loss	—		—		—			—		—		—		—		(30)		(30)
December 31, 2024	4,109,135		59,500,970		$	595		6,343,006		$	(105,866)	$	528,604	$	147,132	$	(92)	$	570,373

See accompanying Notes to Consolidated Financial Statements

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SUN COUNTRY AIRLINES HOLDINGS, INC.

CONSOLIDATED STATEMENTS OF CASH FLOWS (Dollars in thousands)

	Year Ended December 31,
	2024		2023		2022
Net Income	$	52,903	$	72,181	$	17,676
Adjustments to reconcile Net Income to Cash from Operating Activities:
Depreciation and Amortization	94,989		88,151		67,641
Income Tax Receivable Agreement Liability Adjustment	—		(331)		5,000
Operating Lease Right-of-use Assets	2,020		4,291		1,538
Gain on Asset Transactions, net	(6,285)		(1,305)		(1,107)
Amortization of Over-market Assets	1,713		1,300		—
Deferred Income Taxes	14,427		21,886		4,893
Amazon Warrants Expense	4,357		6,066		5,600
Stock-based Compensation Expense	6,020		9,274		2,774
Other, net	367		(2,267)		(1,108)
Changes in Operating Assets and Liabilities:
Accounts Receivable	11,223		(2,667)		(3,312)
Inventory	(5,041)		(1,458)		(3,014)
Prepaid Expenses	1,986		(4,394)		(2,918)
Lessor Maintenance Deposits	(15,712)		(12,047)		(13,005)
Aircraft Deposits	—		(457)		(2,583)
Other Assets	(3,573)		(2,881)		(8,403)
Accounts Payable	(2,961)		(3,028)		17,623
Accrued Transportation Taxes	2,437		430		4,930
Air Traffic Liabilities	2,690		1		39,433
Loyalty Program Liabilities	864		(1,701)		(4,281)
Operating Lease Obligations	(2,178)		(4,387)		(1,718)
Other Liabilities	4,616		7,463		1,781
Net Cash Provided by Operating Activities	164,862		174,120		127,440
Cash Flows from Investing Activities:
Purchases of Property & Equipment	(47,332)		(218,160)		(187,922)
Proceeds from the Sale of Property & Equipment	17,166		4,953		2,451
Purchases of Investments	(92,404)		(95,535)		(178,960)
Proceeds from the Maturities of Investments	130,125		137,220		5,000
Other, net	842		291		10,101
Net Cash Provided by (Used in) Investing Activities	8,397		(171,231)		(349,330)
Cash Flows from Financing Activities:
Common Stock Repurchases	(12,134)		(68,585)		(25,054)
Proceeds from Borrowings	70,000		119,200		188,277
Repayment of Finance Lease Obligations	(45,942)		(21,883)		(42,062)
Repayment of Borrowings	(145,518)		(69,276)		(113,492)
Other, net	(2,874)		(1,593)		(636)
Net Cash (Used in) Provided by Financing Activities	(136,468)		(42,137)		7,033
Net Increase (Decrease) in Cash, Cash Equivalents and Restricted Cash	36,791		(39,248)		(214,857)
Cash, Cash Equivalents and Restricted Cash--Beginning of the Period	63,680		102,928		317,785
Cash, Cash Equivalents and Restricted Cash--End of the Period	$	100,471	$	63,680	$	102,928

SUN COUNTRY AIRLINES HOLDINGS, INC.

CONSOLIDATED STATEMENTS OF CASH FLOWS

(Dollars in thousands)

	Year Ended December 31,
	2024		2023		2022
Supplemental information:
Cash Payments for Interest	$	42,784	$	41,454	$	24,051
Cash Payments for Income Taxes, net	392		1,498		1,691
Non-cash transactions:
Aircraft and Flight Equipment Acquired under Finance Leases	40,116		18,419		40,480
Changes to Finance Lease Assets due to Lease Modifications	6,513		26,427		46,311
Aircraft and Flight Equipment Acquired from Exercise of Finance Lease Purchase Option, net of Accumulated Depreciation	40,632		2,386		28,012
Purchases of Property & Equipment in Accounts Payable	3,219		3,035		4,367
Property & Equipment Acquired through Maintenance Contract Incentive Liability	10,307		2,149		—
Maintenance Rights Asset Capitalized into Aircraft and Flight Equipment upon End of Lease	5,054		—		—
Maintenance Rights Asset Converted to Accounts Receivable upon End of Lease	4,265		—		—
Settlement of Accelerated Share Repurchase Program	—		7,501		—
Derecognition of Operating Lease Right-of-Use Assets, net due to Purchase Aircraft and Flight Equipment	—		—		8,674
Derecognition of Operating Lease Obligations due to Purchase Aircraft and Flight Equipment	—		—		8,674

The following provides a reconciliation of Cash, Cash Equivalents and Restricted Cash to the amounts reported on the Consolidated Balance Sheets:

	December 31,
	2024		2023		2022
Cash and Cash Equivalents	$	83,219	$	46,279	$	92,086
Restricted Cash	17,252		17,401		10,842
Total Cash, Cash Equivalents and Restricted Cash	$	100,471	$	63,680	$	102,928

See accompanying Notes to Consolidated Financial Statements

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SUN COUNTRY AIRLINES HOLDINGS, INC.

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS

(Dollars in thousands, except per share and share amounts)

1. COMPANY BACKGROUND

Sun Country Airlines Holdings, Inc. is the parent company of Sun Country, Inc., which is a certificated air carrier providing scheduled passenger service, air cargo service, charter air transportation and related services. Services are provided to the general public, cargo customers, military branches, collegiate and professional sports teams, wholesale tour operators, schools, companies and other individual entities for air transportation to various U.S. and international destinations. Except as otherwise stated, the financial information, accounting policies, and activities of Sun Country Airlines Holdings, Inc. are referred to as those of the "Company" or "Sun Country".

2. BASIS OF PRESENTATION AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES

Principles of Consolidation – The consolidated financial statements include the accounts of Sun Country Airlines Holdings, Inc. and its subsidiaries and have been prepared in accordance with U.S. GAAP. All material intercompany balances and transactions have been eliminated in consolidation. The Company reclassified certain prior period amounts to conform to the current period presentation. The Company operates its fiscal year on a calendar year basis.

Use of Estimates – The preparation of financial statements in conformity with GAAP requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities, revenues and expenses and the disclosure of contingent assets and liabilities at the date of the financial statements and the reported amounts of revenues and expenses during the reporting periods. Actual results could differ from those estimates. Significant areas of judgment relate to passenger revenue recognition, maintenance under the built-in overhaul method, lease accounting, impairment of long-lived and other intangible assets, and air traffic liabilities.

Management believes that all adjustments necessary for the fair presentation of results, consisting of normally recurring items, have been included in the Consolidated Financial Statements.

A summary of significant accounting policies consistently applied in the preparation of the accompanying financial statements is as follows:

Revenue Recognition – Scheduled Service, Charter, and most ancillary revenues are recognized when the passenger flight occurs. Revenues exclude amounts collected on behalf of other parties, including transportation taxes.

Scheduled Service. The Company initially defers ticket sales as an Air Traffic Liability and recognizes revenue when the passenger flight occurs. Unused non-refundable tickets expire at the date of scheduled travel and are recorded as revenue unless the customer notifies the Company in advance of such date that the customer will not travel. If notification is made, a travel credit is created for the face value, including ancillary fees, less applicable change fees. Travel credits may generally be redeemed toward future travel for up to 12 months after the date of the original booking. Therefore, these credits are recorded as a current liability on the Company's Consolidated Balance Sheets. The Company records an estimate for travel credits that will expire unused, otherwise known as breakage, in Passenger Revenue upon issuance of the travel credit. The estimated breakage rate is primarily based on historical experience of travel credit activity and other factors that may not be indicative of future trends, such as program changes or modifications that could affect the ultimate usage patterns of tickets and travel credits. The Company continuously monitors its breakage rate assumptions and may adjust its estimated breakage rate in the future. Changes in the Company’s estimated breakage rate impact revenue recognition prospectively. The Company currently accounts for direct selling costs, including credit card fees, and commissions, in accordance with the terms of each service. The expense is deferred and recognized when the travel occurs.

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SUN COUNTRY AIRLINES HOLDINGS, INC.

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS

(Dollars in thousands, except per share and share amounts)

Ancillary. Ancillary revenue consists primarily of revenue generated from air travel-related services such as baggage fees, seat selection and upgrade fees, priority check-in and boarding fees, other fees and on-board sales, which are recognized when the associated flight occurs. Revenue for change fees is deferred and recognized when the passenger travel occurs. Fees received in advance of the flight date are initially recorded as an Air Traffic Liability.

Charter. Our Charter business includes ad hoc, repeat, short-term and long-term service contracts that typically include pass-through fuel arrangements. Under these Charter agreements, the Company is obligated to provide aircraft, crew, maintenance, and insurance for travel. Customers are generally responsible for aircraft fuel, transportation taxes, and certain other flight expenses, which are typically arranged by the Company. When functioning as the customers' agent for arranging such services, the Company records amounts reimbursable from the customer as revenues, net of the associated costs incurred to fulfill the performance obligations. In certain situations, the Company may be responsible for the aforementioned costs and is reimbursed by the customer. In these situations, the Company is the principal. The reimbursed costs are recognized as revenue and the costs are recognized as expenses on the Company's Statement of Operations.

Revenue is recognized as the services are performed based on Block Hours operated on behalf of customers. The costs of obtaining the Company's Charter contracts are not material.

Cargo. In December 2019, the Company signed the ATSA with Amazon. In June 2024, the Company entered into the A&R ATSA with Amazon that will increase the number of Boeing 737-800 cargo aircraft that Sun Country operates on behalf of Amazon from 12 to 20 in 2025. The first additional aircraft was received in January 2025 and is expected to begin service in the first quarter of 2025. All eight additional aircraft are expected to be operational by the end of the third quarter of 2025. The A&R ATSA includes an initial six-year term, which expires in October 2030. The agreement includes two additional, two-year renewal terms exercisable at Amazon's option, and a subsequent three-year renewal term subject to mutual written agreement, which, if not agreed to, will trigger a final two-year wind-down term. The ATSA has annual rate escalations. Cargo revenue is typically recognized based on hours flown, number of flights, and the number of aircraft operated during a reporting period.

The A&R ATSA contains three performance obligations: Flight Services, Heavy Maintenance and Fuel; all of which are unchanged from the original ATSA. As Sun Country is the principal in providing Flight Services, revenue and related costs are recognized gross on the Statement of Operations. Sun Country acts as the agent in providing the Heavy Maintenance and Fuel performance obligations, which are reimbursed by Amazon based on the actual costs incurred. Consumption of aircraft fuel and heavy maintenance are recognized in revenue, net of the associated costs incurred to fulfill the performance obligations.

The A&R ATSA with Amazon consists of three main components of consideration, which are unchanged from the original ATSA; a fixed amount is received each month per aircraft, a fixed amount is received each month per flight, and an amount per block hour is received each month. The A&R ATSA contains a SLA and penalties for certain delays and cancellations. The SLA can result in a bonus or penalty for the month depending on the Company's performance. The economics of the three main components of consideration and the SLA for the A&R ATSA have been revised from the original ATSA. When determining the transaction price, the Company will estimate the variable consideration and consideration payable to Amazon over the contract term. Each period, the Company updates its estimate for the variable consideration and consideration payable to the customer and treats the adjustment as an adjustment to the transaction price. When updating the estimate, the Company considers whether there are any changes in expected block hours, changes in expected bonuses or penalties based on performance, changes in warrants expected to be issued, and changes in reimbursable costs. The transaction price is allocated to the performance obligations based on their relative standalone selling price. The transaction price for Flight Services, which includes an upfront payment for startup costs, is reduced by the estimated value of warrants to be issued to Amazon based on expected performance under the A&R ATSA.

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SUN COUNTRY AIRLINES HOLDINGS, INC.

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS

(Dollars in thousands, except per share and share amounts)

Loyalty Program Accounting – The Company records a liability for loyalty points earned by passengers under its Sun Country Rewards program using two methods: 1) a liability for points that are earned by passengers on purchases of the Company’s services is established by deferring revenue based on the redemption value net of breakage, and 2) a liability for points attributed to loyalty points issued to the Company’s co-branded credit card holders is established by deferring a portion of payments received from the Company’s co-branded agreement. The Company’s Sun Country Rewards program allows for the redemption of loyalty points to include payment towards air travel, land travel, taxes, and other ancillary purchases. The Company determines the standalone selling price of loyalty points issued using a redemption value approach, which considers the value a passenger will receive upon redemption of the loyalty points. Consideration allocated to loyalty points is deferred, net of estimated breakage, and recognized as Passenger Revenue when both the loyalty points have been redeemed and the passenger travel occurs. The Company estimates breakage for loyalty points that are not likely to be redeemed. These estimates are based on historical experience of loyalty point redemption activity and other factors, such as program changes and modifications that could affect the ultimate usage pattern of loyalty points. The current portion of the Loyalty Point Liability is an estimate based on historical redemption patterns over the past 12 months.

Under the Company's co-branded credit card program, funds received for the marketing of a co-branded credit card and delivery of loyalty points are accounted for as a multiple-deliverable arrangement. The arrangement has two distinct performance obligations: loyalty points to be awarded, and brand and marketing. Funds received are allocated based on relative standalone selling price. Revenue for the brand and marketing performance obligation is recognized as revenue when earned and recorded in Other Revenue. Consideration allocated to loyalty points is deferred and recognized as Passenger Revenue when both the loyalty points have been redeemed and the passenger travel occurs.

Cash and Equivalents – The Company considers all highly liquid investments with an original maturity of three months or less to be cash equivalents. The Company maintains cash balances at several financial institutions; at times, such balances may be in excess of insurance limits. The Company has not experienced any losses on these balances.

Restricted Cash – The Company's Restricted Cash balance primarily relates to Charter revenue receipts received prior to the date of transportation. These amounts are also recorded as a component of the Company's Air Traffic Liabilities. DOT regulations require that Charter revenue receipts received prior to the date of transportation are maintained in a separate third-party escrow account. The restrictions are released once transportation is provided, which is typically within 12 months of booking. For that reason, the balance of Restricted Cash is classified as a current asset on the Company's Consolidated Balance Sheets.

Investments – The Company's investments consist of Debt Securities and Certificates of Deposit. The Certificates of Deposit are recorded at cost, plus accrued interest. These certificates serve as collateral for letters of credit required by various airports and other vendors. All of the certificates have original maturities greater than 90 days.

The Debt Securities are classified as Current Assets on the Consolidated Balance Sheets because the securities are highly liquid and are available to be quickly converted into known amounts of cash to fund current operations. These investments have original maturities of three months or greater. As of December 31, 2024, all of the Company's outstanding Debt Securities will mature by June 2026. The Company limits its exposure to any one issuer or market sector and largely limits its investments to investment grade quality securities. Securities downgraded below policy minimums after purchase will be disposed of in accordance with the Company’s investment policy.

The Company's Debt Securities are classified as Available-for-Sale and are reported at fair value on the Company's Consolidated Balance Sheets. Unrealized gains and losses on the Company's Available-for-Sale securities are excluded from Net Income and are reported as a component of Accumulated Other Comprehensive Income, net of income tax effects, within Stockholders' Equity on the Consolidated Balance Sheets until realized. Realized gains and losses are recorded using the specific identification method and

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SUN COUNTRY AIRLINES HOLDINGS, INC.

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS

(Dollars in thousands, except per share and share amounts)

reflected in Other, net within Non-operating Income (Expense), net on the Company's Consolidated Statement of Operations. The Company did not realize any gains or losses on its Available-for-Sale investments for the years ended December 31, 2024, 2023 and 2022. Premiums and discounts recorded on Available-for-Sale debt securities are accounted for in Interest Income within Non-operating Income (Expense), net on the Company's Consolidated Statement of Operations.

At each reporting period, the Company assesses its Available-for-Sale investments in an unrealized loss position to determine whether an impairment exists. The Company will record an impairment if management intends to sell an impaired security, will likely be required to sell a security before recovery of the entire amortized cost, or the same level of collectible cash flows from the security is no longer expected. The entire impairment will be included in Other, net within Non-operating Income (Expense), net on the Company's Consolidated Statement of Operations. The Company did not recognize any impairment losses on its Available-for-Sale investments for the years ended December 31, 2024, 2023 and 2022.

Accounts Receivable – Accounts Receivable are recorded at the amount due from customers and do not bear interest. They consist primarily of amounts due from Amazon, credit card companies associated with ticket sales and Charter customers. The Company's Accounts Receivable balances at December 31, 2024 and 2023 also included $612 and $664, respectively, due from aircraft lessors related to maintenance deposits. Accounts outstanding longer than the contractual payment terms are considered past due. The Company determines its allowance for credit losses by considering a number of factors, including the length of time accounts receivable are past due, the Company’s previous loss history, the customer’s current ability to pay its obligation to the Company, and the condition of the general economy and the industry as a whole. During the year ended December 31, 2024, no amounts in Accounts Receivable were written off. For the years ended December 31, 2023 and 2022, $127 and $70 in Accounts Receivable were written off, respectively.

Lessor Maintenance Deposits – Certain of the Company’s aircraft lease agreements provide that the Company pay maintenance reserves monthly to aircraft lessors to be held as collateral in advance of major maintenance activities required to be performed by the Company. Generally, maintenance reserve payments are variable based on actual flight hours or cycles. These lease agreements provide that maintenance reserves are reimbursable to the Company upon completion of the maintenance event in an amount equal to the lesser of (1) the amount of the maintenance reserve held by the lessor associated with the specific maintenance event or (2) the qualifying costs related to the specific maintenance event.

Maintenance reserve payments that are expected to be recoverable via reimbursable expenses are reflected as Lessor Maintenance Deposits on the accompanying Consolidated Balance Sheets. These deposits are expected to be reimbursed to the Company upon performance of maintenance activities. Upon completion of the maintenance event, the lessor is billed and the amount due is recorded in Accounts Receivable. Lessor Maintenance Deposits deemed improbable of recovery are expensed as incurred and recorded within Aircraft Rent.

The Company makes certain assumptions at the inception of the lease and at each Balance Sheet date to determine the recoverability of maintenance deposits. These assumptions are based on various factors, such as the estimated time between the maintenance events, the cost of such maintenance events, the date the aircraft is due to be returned to the lessor, and the estimated number of flight hours and cycles the aircraft is to be utilized before it is purchased or returned to the lessor. Changes in estimates are accounted for on a prospective basis. As of December 31, 2024, all maintenance deposits are estimated to be recoverable either through reimbursable maintenance events or through application towards the purchase of the aircraft.

Inventory – Inventory primarily consist of expendable parts related to flight equipment, which cannot be economically repaired, reconditioned or reused after removal from the aircraft, are carried at average cost and charged to operations as consumed. An allowance for obsolescence and excess is provided over the remaining useful life of the related fleet for spare parts expected to be on hand at the date that aircraft type is retired from service. These parts are assumed to have an estimated residual value of 10% of the original cost.

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SUN COUNTRY AIRLINES HOLDINGS, INC.

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS

(Dollars in thousands, except per share and share amounts)

Leases – Lease classification is evaluated by the Company at lease commencement and when significant amendments are executed. The Company's leases generally do not provide a readily determinable implicit rate; therefore, the Company estimates the incremental borrowing rate to discount lease payments based on information available at lease commencement. The lease term consists of the noncancellable period of the lease and periods covered by options to extend the lease if the Company is reasonably certain to exercise the option. For leases of 12 months or less, the Company expenses lease payments on a straight-line basis over the lease term.

Operating Lease Right-of-Use Asset and Liabilities

For all operating leases with a term greater than 12 months, the Company recognizes a right-of-use asset and a lease liability at the lease commencement date based on the estimated present value of future minimum lease payments, which includes certain lease and non-lease components, over the lease term. Operating Lease Right-of-use Assets and Operating Lease Obligations have their own lines on the Consolidated Balance Sheets.

Finance Leases

Finance leases are initially recorded at the net present value of future minimum lease payments, which includes certain lease and non-lease components. Finance leases generally have one of these five attributes: 1) ownership of the underlying asset transfers to the Company at the end of the lease term, 2) the lease agreement contains a purchase option that the Company is reasonably certain to exercise, 3) the lease term represents the major part of the asset’s economic life, 4) the present value of lease payments over the lease term equals or exceeds substantially all of the fair value of the asset, and 5) the underlying asset is so specialized in nature that it provides no alternative use to the lessor after the lease term. Finance Lease Assets are presented separately on the Consolidated Balance Sheets. The Company depreciates Finance Lease Assets consistent with its useful life policy presented within "Property & Equipment".

Leased Aircraft Return Costs

The Company's aircraft lease agreements often contain provisions that require the Company to return aircraft airframes, engines, and other aircraft components to the lessor in a certain condition or pay an amount to the lessor based on the airframe and engine's actual return condition. Lease return costs are recognized beginning when it is probable that such costs will be incurred and they can be estimated. The Company assesses the need to accrue lease return costs periodically throughout the year or whenever facts and circumstances warrant an assessment. When costs become both probable and estimable, lease return costs are expensed on the Consolidated Statements of Operations.

Property & Equipment – Property and equipment are recorded at cost or fair value on the date of acquisition and depreciated, when the asset is ready for its intended use, on a straight-line basis to an estimated residual value over their estimated useful lives or lease term (if applicable), whichever is shorter, as follows:

Airframes	10-25 years (depending on age)
Engines – Core	7 or 12 years (based on remaining cycles)
Engines - Initial Greentime (time remaining until the first scheduled major maintenance event)	1st scheduled maintenance event
Leasehold Improvements, Aircraft, Other	3-25 years (or life of lease, if shorter)
Office and Ground Equipment	5-7 years
Computer Hardware and Software	3-5 years
Property and Equipment under Finance Leases (1)	Lesser of the lease term or economic life
Rotable Parts	Average remaining life of aircraft fleet, currently estimated to be 9 years

_____________________________

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SUN COUNTRY AIRLINES HOLDINGS, INC.

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS

(Dollars in thousands, except per share and share amounts)

(1)	For finance leases where the Company is reasonably certain to exercise the purchase option, the lease asset value is assigned to the engine and airframe components which are depreciated on a straight-line basis in accordance with the useful lives outlined in the table above.

Our tangible assets consist primarily of Aircraft and Flight Equipment, which are mobile across geographic markets. Therefore, assets are not allocated to specific geographic regions.

Modifications that enhance the operating performance or extend the useful lives of leased airframes are considered leasehold improvements and are capitalized and depreciated over the economic life of the asset or the term of the lease, whichever is shorter. Similar modifications made to owned aircraft are capitalized and depreciated consistent with the Company’s policy.

The Company capitalizes certain internal and external costs associated with the acquisition and development of internal-use software for new products, and enhancements to existing products, that have reached the application development stage and meet recoverability tests. Capitalized costs include external direct costs of materials and services utilized in developing or obtaining internal-use software, and labor cost for employees who are directly associated with, and devote time to, internal-use software projects.

The Company depreciates Rotable Parts to an estimated residual value using the pooling life method. Depreciation under the pooling life method is calculated over the estimated average useful life of the passenger aircraft fleet.

The Company capitalizes certain costs of activities necessary to get the asset ready for its intended use. Capitalized interest represents interest costs incurred during the aircraft induction period, capitalization ceases when the asset is ready for service.

Airframe and Engine Maintenance – The Company accounts for non-major maintenance and repair costs incurred, as well as major maintenance costs of owned airframes, all leased airframes, and engines acquired via operating leases, using the expense as incurred method. Certain costs covered by third-party maintenance agreements are charged to expense based on fleet utilization, as defined by the contract. These expenses are reported as a component of Maintenance expense on the accompanying Consolidated Statements of Operations.

The Company applies the built-in overhaul method for significant maintenance costs of owned engines, as well as to engines acquired via finance leases where the Company is reasonably certain to exercise a purchase option. Under this method, engine values are separated into amounts for life limited parts and “greentime”, representing the value of the engine for the time on-wing remaining until the next anticipated major maintenance event. Life limited parts are capitalized based on catalog rates published by the original equipment manufacturer and depreciated over their estimated useful lives. Initial engine "greentime" and subsequent major engine maintenance events are capitalized and depreciated until the next anticipated major maintenance event, assuming no residual value. The period until the next scheduled major maintenance event is estimated based on assumptions such as estimated cycles, hours, and months, required maintenance intervals, and the age/condition of related parts. These assumptions may change based on forecasted aircraft utilization changes, updates to government regulations, and manufacturer maintenance intervals, as well as unplanned incidents causing damage requiring a major maintenance event prior to a scheduled visit. If the estimated timing of the next maintenance event changes, the related depreciation period changes prospectively. These expenses are reported as a component of Depreciation and Amortization on the accompanying Consolidated Statements of Operations.

Maintenance Rights Asset - During the year ended December 31, 2023, the Company acquired five Boeing 737-900ERs that at the time of purchase were on lease to an unaffiliated airline. Upon purchase of the Owned Aircraft Held for Operating Lease, the Company recognized a Maintenance Rights Asset which represents the Company’s contractual right to receive the aircraft in a specified maintenance condition at the end of the lease.

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SUN COUNTRY AIRLINES HOLDINGS, INC.

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS

(Dollars in thousands, except per share and share amounts)

The acquired leases contain an end of lease compensation clause whereby the lessee is required to perform the maintenance tasks needed to physically restore the airframe and engines to full-life condition or remit a cash payment to compensate the Company for the maintenance shortfall. The asset represents the difference between the Owned Aircraft Held for Operating Lease’s physical maintenance condition as of the purchase date and the contractual return condition at the end of the lease term. The Maintenance Rights Asset is not depreciated over the lease term, nor will it accrete as additional life is consumed on the aircraft.

Subsequent accounting for the Maintenance Rights Asset will occur at the end of the lease term when the end of lease compensation has been settled between the Company and the unaffiliated lessee. One of the following scenarios will occur based on the underlying facts and circumstances: 1) the aircraft is returned at lease expiry in the contractually specified maintenance condition without any cash payment to the Company by the lessee, the Maintenance Rights Asset is relieved, and an aircraft improvement asset is recorded to the extent the improvement is substantiated and deemed to meet the Company’s capitalization policy; 2) the lessee pays the Company cash compensation at lease expiry in excess of the value of the Maintenance Rights Asset, the excess is recognized as revenue and presented within Other Revenue on the Consolidated Statements of Operations; or 3) the lessee pays the Company cash compensation at lease expiry that is less than the value of the Maintenance Rights Asset, the shortfall is recorded as an aircraft improvement asset to the extent the improvement is substantiated and meets the Company’s capitalization policy, if it does not meet capitalization criteria the shortfall is recognized as an expense within Maintenance on the Consolidated Statements of Operations. Any aircraft improvement will be applied at the aircraft component level, will be depreciated in accordance with the Company’s policy and reported as a component of Depreciation and Amortization on the accompanying Consolidated Statements of Operations.

Asset Impairment Analysis – Long-lived assets, such as Property & Equipment and Finite-Lived Other Intangible Assets are reviewed for impairment whenever events or changes in circumstances indicate that the carrying amount of an asset (or asset group) may not be recoverable. If circumstances require a long-lived asset or asset group be tested for impairment, the Company first compares the undiscounted cash flows expected to be generated by that asset or asset group to its carrying amount. If the carrying amount of the long-lived asset or asset group is not recoverable on an undiscounted cash flow basis, an impairment is recognized to the extent that the carrying amount exceeds its fair value. Fair value is determined using various valuation techniques including discounted cash flow models, quoted market values and third-party independent appraisals, as considered necessary.

No impairment losses on the Company's long-lived assets were recognized during the years ended December 31, 2024, 2023 or 2022.

Goodwill and Other Intangible Assets – Goodwill represents the excess purchase price over the estimated fair value of net assets acquired in a business combination. Other Intangible Assets with Indefinite-Lives represents a tradename acquired in a business combination. Other Intangible Assets with Finite-Lives represent customer relationships acquired in a business combination and over-market lease assets acquired when the Company purchased five Owned Aircraft Held for Operating Lease. Goodwill and Other Intangible Assets with Indefinite-Lives must be tested for impairment at least annually, or more frequently if events or changes in circumstances indicate that they might be impaired. Goodwill is tested at the reporting unit level. The Company has two reporting units: Passenger and Cargo, all of the Company's Goodwill balance is associated with the Passenger reporting unit.

Other Intangible Assets with Finite-Lives are amortized over an estimated useful life. The estimated useful life for the Company's customer relationship intangible asset was based on several factors, including the effects of demand, competition, contractual relationship, and other business factors. The Company concluded that the customer relationships Finite-Lived Other Intangible Assets have an estimated life of 12 years and are being amortized over this period on a straight-line basis. The Company's over-market lease asset will be amortized over the remaining lease terms for the respective aircraft. As of December 31, 2024, the remaining leases expire over various dates through the fourth quarter of 2025. In January 2025, amendments were executed to

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SUN COUNTRY AIRLINES HOLDINGS, INC.

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS

(Dollars in thousands, except per share and share amounts)

extend the lease expiry terms for three of the four remaining Owned Aircraft Held for Operating Lease, which now expire over various dates through the fourth quarter of 2026.

The value of Goodwill and Other Indefinite-lived Intangible Assets is assessed under either a qualitative or quantitative approach. Under a qualitative approach, the Company considers various market factors, including certain key assumptions, such as the market value of the airline and other airlines, fuel prices, the overall economy, passenger yields and changes to the regulatory environment. The Company analyzes these factors to determine if events and circumstances have affected the fair value of Goodwill and Other Indefinite-lived Intangible Assets. If it is determined that it is more likely than not that the asset may be impaired, the Company uses a quantitative approach to determine the reporting unit or intangible asset’s fair value incorporating the key assumptions listed below. An impairment charge is recorded for the amount of carrying value that exceeds the determined fair value as of the testing date.

When the Company evaluates Goodwill or its Other Indefinite-Lived Intangible Assets for impairment using a quantitative approach, the Company utilizes market and income approach valuation techniques. These measurements include the following key assumptions, 1) forecasted revenues, expenses and cash flows, 2) current discount rates, 3) comparative market multiples, 4) observable market transactions, and 5) anticipated changes to the regulatory environment. These assumptions are consistent with those that hypothetical market participants would use. Because the Company is required to make estimates and assumptions when evaluating Goodwill and Other Indefinite-Lived Intangible Assets for impairment, actual transaction amounts may differ materially from these estimates.

The Company performed its most recent annual Goodwill and Other Indefinite-Lived Intangible Assets impairment analysis as of October 1, 2024. The Company did not recognize any impairment losses for the years ended December 31, 2024, 2023 or 2022.

Income Taxes – Deferred income taxes are recognized for the tax consequences in future years of differences between the tax basis of assets and liabilities and their financial reporting amounts at each year end based on enacted tax laws and statutory tax rates applicable to the periods in which the differences are expected to affect taxable income. Valuation allowances are established when necessary to reduce Deferred Tax Assets to the amount expected to be realized. All Deferred Tax Assets and Liabilities, along with any related valuation allowance, are classified as noncurrent on the Consolidated Balance Sheets. Interest and penalties on uncertain tax positions, to the extent they exist, are included in the Company’s provision for income taxes. The provision for income taxes represents the current tax expense for the period and the change during the period in Deferred Tax Assets and Liabilities.

TRA Liability – In connection with the Company’s IPO, the legal entity Sun Country Airlines Holdings, Inc. entered into a TRA with the pre-IPO stockholders (the “TRA holders”). The TRA provides for the payment by the Company to the TRA holders of 85% of the amount of cash savings, if any, in U.S. federal, state, local, and foreign income tax that the Company actually realizes (or are deemed to realize in certain circumstances) as a result of certain tax attributes that existed at the time of the IPO (the “Pre-IPO Tax Attributes”). The Company will retain the benefit of the remaining 15% of these cash savings.

Future adjustments in the TRA Liability balance and/or timing of TRA Liability payments are contingent upon, among other things, 1) generation of future taxable income over the term of the TRA, 2) the Company’s participation in future government programs, and 3) future changes in tax laws. All adjustments to the TRA Liability were recorded in Other, net within Non-Operating Income (Expense), net in the Company’s Consolidated Statements of Operations.

The Company began making TRA payments during the year ended December 31, 2023. TRA payments are classified as Financing Activities in the Company's Consolidated Statement of Cash Flows. The portion of the TRA expected to be paid in the next 12 months is reflected as a current liability on the Consolidated Balance Sheets. All other amounts are reflected as a non-current liability on the Consolidated Balance Sheets.

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SUN COUNTRY AIRLINES HOLDINGS, INC.

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS

(Dollars in thousands, except per share and share amounts)

Aircraft Fuel - The Company’s operations are inherently dependent upon the price of aircraft fuel. Aircraft fuel expense includes jet fuel, federal and state taxes, and other fees. As of December 31, 2024 and 2023, the Company had no outstanding fuel derivative contracts.

Sales and Marketing - Sales and Marketing expense includes credit card processing fees, travel agent commissions and related global distribution systems fees, advertising, sponsorship and distribution costs, such as the costs of our call centers, and costs associated with our loyalty program. The Company expenses advertising costs as incurred.

Equity Incentive Plan – Under its Equity Incentive Plan, the Company has primarily issued Time-Based Stock Options, Performance-Based Stock Options, Restricted Stock, PRSUs, and RSU awards. Further, the Company has elected to account for forfeitures as they occur, rather than forecasting the future forfeitures. If an award is forfeited prior to vesting, the associated reduction in expense is reflected net in stock-based compensation expense in that period. Stock compensation expense is reported as a component of Salaries, Wages, and Benefits within the Company's Consolidated Statement of Operations. See Note 9 for further information on the Equity Incentive Plan.

Earnings per Share - Basic earnings per share, which excludes dilution, is computed by dividing Net Income available to common stockholders by the weighted average number of shares of common stock outstanding for the period. Diluted earnings per share reflects the potential dilution that could occur if securities or other contracts to issue common stock were exercised or converted into common stock. The number of incremental shares from the assumed issuance of shares relating to securities or other contracts to issue common stock is calculated by applying the treasury stock method. The treasury stock method assumes a hypothetical issuance of shares to settle the securities or other contracts to issue common stock, with the assumed proceeds used to purchase common stock at the average market price for the period. Assumed proceeds include the amount to be paid upon exercise, if applicable, and the average unrecognized compensation cost. The difference between the number of shares assumed issued and the number of shares assumed purchased represents the dilutive shares.

Warrants held by Amazon are included in the calculation of dilutive weighted average shares outstanding as of the date the warrants vest to the extent the impact is dilutive. The unvested warrants have not been included in dilutive shares as their performance condition has not been satisfied.

During the year ended December 31, 2023, all conditions associated with the time-based and performance-based options granted under the SCA Acquisition Holdings, LLC Amended and Restated Equity Incentive Plan were met. As a result, 100% of the performance-based stock options vested and are included in the calculation of dilutive shares to the extent the impact is dilutive. As of December 31, 2022, 33% of the performance-based stock options had vested and 59% of the awards were expected to vest. Prior to this, the performance conditions for the Company's unvested performance-based stock options were assessed quarterly and were included in the calculation of dilutive shares to the extent that the performance conditions had been met and the impact would be dilutive.

Concentration Risk

Approximately 25% and 27% of the Company’s Accounts Receivable balances as of December 31, 2024, and 2023 were due from Amazon, respectively. In addition, approximately 13% and 21% of the Company’s Accounts Receivable balances as of December 31, 2024 and 2023, were due from one financial institution for tickets purchased via credit cards.

Approximately 45% of the Company's fuel purchases were made from two vendors that each had fuel purchases representing 10% or more of the Company's total fuel purchases during the year ended December 31, 2024. Approximately 59% and 69% of the Company's fuel purchases were made from three vendors that each had fuel purchases representing 10% or more of the Company's total fuel purchases for the years ended December 31, 2023 and 2022, respectively.

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NOTES TO CONSOLIDATED FINANCIAL STATEMENTS

(Dollars in thousands, except per share and share amounts)

Approximately 60% of the Company’s workforce were under union contracts as of December 31, 2024 with four different unions: ALPA, IBT, TWU and AMFA. As of December 31, 2024, approximately 100% of the Company’s union workforce are under contracts that are being negotiated, have become amendable or will expire within the next year.

Recently Adopted Accounting Standards

In November 2023, the FASB issued ASU 2023-07, Segment Reporting (Topic 280): Improvements to Reportable Segment Disclosures. This ASU adds required disclosures of significant expenses for each reportable segment, as well as certain other disclosures to help users of financial statements understand how the CODM evaluates segment expenses and operating results. The ASU does not change how an entity identifies its operating segments. The ASU is effective for fiscal years beginning after December 15, 2023, and interim periods within fiscal years beginning after December 15, 2024, with early adoption permitted. On January 1, 2024, the Company adopted ASU 2023-07 on a prospective basis, as required by the standard. See Note16 included within these Consolidated Financial Statements for additional information.

Recently Issued Accounting Standards

In December 2023, the FASB issued ASU 2023-09, Income Taxes (Topic 740): Improvements to Income Tax Disclosures. This ASU requires, among other disclosures, greater disaggregation of information, the use of certain categories in the rate reconciliation, and the disaggregation of income taxes paid by jurisdiction. The ASU is effective for public business entities for fiscal years beginning after December 15, 2024, with early adoption permitted. The Company continues to assess the impact of this ASU on its Consolidated Financial Statements.

In November 2024, the FASB issued ASU 2024-03, Disaggregation of Income Statement Expenses. This ASU requires disaggregated disclosure of income statement expenses for public business entities. The ASU does not change the expense captions an entity presents on the face of the Statement of Operations; rather, it requires disaggregation of certain expense captions into specified categories in disclosures within the footnotes of the financial statements. The ASU is effective for public business entities for fiscal years beginning after December 15, 2026, and interim periods within fiscal years beginning after December 15, 2027, with early adoption permitted. The Company continues to assess the impact of this ASU on its Consolidated Financial Statements.

3. REVENUE

Sun Country is a certificated air carrier generating Operating Revenues from Passenger (consisting of Scheduled Service, Charter, and Ancillary), Cargo and Other revenue. Scheduled Service revenue mainly consists of base fares. Charter revenue is primarily generated through service provided to the DoD, collegiate and professional sports teams, and casinos. Ancillary revenues consist of revenue earned from air travel-related services, such as: baggage fees, seat selection fees, other fees and on-board sales. Cargo consists of revenue earned from flying cargo aircraft for Amazon under both the original ATSA and the A&R ATSA. For more information on the original and the A&R ATSA, see Note 2 included within these Consolidated Financial Statements. Other revenue consists primarily of revenue from services in connection with Sun Country Vacations products and rental revenue related to certain transactions where the Company serves as a lessor.

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(Dollars in thousands, except per share and share amounts)

The significant categories comprising Operating Revenues are as follows:

	Year Ended December 31,
	2024		2023		2022
Scheduled Service	$	409,133	$	453,862	$	438,308
Charter	197,045		190,128		161,619
Ancillary	307,909		276,133		192,506
Passenger	914,087		920,123		792,433
Cargo	107,174		99,735		90,350
Other	54,478		29,762		11,661
Total Operating Revenue	$	1,075,739	$	1,049,620	$	894,444

The Company attributes and measures its Operating Revenue by geographic region as defined by the DOT for airline reporting based upon the origin of each passenger and cargo flight segment.

The Company’s operations are highly concentrated in the U.S., primarily within its MSP home market, but include service to many international locations, primarily based on Scheduled Service to Latin America during the winter season and on military Charter flights.

Total Operating Revenues by geographic region are as follows:

	Year Ended December 31,
	2024		2023		2022
Domestic	$	1,039,339	$	1,008,582	$	857,764
Latin America	36,400		40,548		36,537
Other	—		490		143
Total Operating Revenue	$	1,075,739	$	1,049,620	$	894,444

Contract Balances

The Company’s contract assets relate to costs incurred to prepare the Amazon cargo aircraft for service under the original ATSA and the A&R ATSA, as well as warrants that have vested and will be amortized against Cargo revenue over the remaining term of the A&R ATSA. The balances are included in Other Current Assets and Other Assets on the Consolidated Balance Sheets.

The Company’s contract liabilities are comprised of: 1) ticket sales for transportation that has not yet been provided (reported as Air Traffic Liabilities on the Consolidated Balance Sheets), 2) outstanding loyalty points that may be redeemed for future travel and other non-air travel awards (reported as Loyalty Program Liabilities on the Consolidated Balance Sheets) and, 3) the Amazon Deferred Up-front Payment received (reported within Other Current Liabilities and Other Long-term Liabilities on the Consolidated Balance Sheets).

As part of the ATSA executed in December 2019, Amazon paid the Company $10,300 toward start-up costs. Upon signing the ATSA, Amazon received 632,183 fully vested warrants to purchase the Company’s common stock, with a fair value of $4,667. This fair value was assigned to a portion of the $10,300 cash received from Amazon and the remaining $5,633 was recorded in Other Liabilities on the Company’s Consolidated Balance Sheets. This deferred up-front payment is being amortized into revenue over the remaining term of the A&R ATSA and is immaterial on an annual basis. The warrant agreement was not amended in connection with the A&R ATSA, and Amazon did not receive any additional warrants in connection with the A&R ATSA. Accordingly, warrants issued to Amazon will continue to vest in accordance with the terms of the warrant agreement executed in December 2019.

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NOTES TO CONSOLIDATED FINANCIAL STATEMENTS

(Dollars in thousands, except per share and share amounts)

Contract Assets and Liabilities are as follows:

	December 31,
	2024		2023
Contract Assets
Amazon Contract	$	4,135	$	1,493
Total Contract Assets	$	4,135	$	1,493
Contract Liabilities
Air Traffic Liabilities	$	160,686	$	157,996
Loyalty Program Liabilities	14,601		13,737
Amazon Contract	1,612		2,575
Total Contract Liabilities	$	176,899	$	174,308

The balance in the Air Traffic Liabilities fluctuates with seasonal travel patterns. Most tickets can be purchased no more than 12 months in advance, therefore any revenue associated with tickets sold for future travel will be recognized within that timeframe. For the year ended December 31, 2024, $155,151 of revenue was recognized in Passenger revenue that was included in the Air Traffic Liabilities as of December 31, 2023.

Loyalty Program

The Sun Country Rewards program provides loyalty awards to program members based on accumulated loyalty points. For more information on the Company's loyalty awards to program members, see Note 2 include within these Consolidated Financial Statements. The balance of the Loyalty Program Liabilities fluctuates based on seasonal patterns, which impacts the volume of loyalty points awarded through travel or issued to co-branded credit card and other partners (deferral of revenue) and loyalty points redeemed (recognition of revenue). Due to these reasons, the timing of loyalty point redemptions can vary significantly.

Changes in the Loyalty Program Liabilities are as follows:

	2024		2023
Balance - January 1	$	13,737	$	15,437
Loyalty Points Earned	8,810		8,250
Loyalty Points Redeemed (1) (2)	(7,946)		(9,950)
Balance - December 31	$	14,601	$	13,737

________________________________

(1)	Loyalty points are combined in one homogenous pool, that includes both air and non-air travel awards, and are not separately identifiable. As such, the revenue recognized is comprised of points that were part of the Loyalty Program Liabilities balance at the beginning of the period, as well as points that were earned during the period.
(2)	Includes $355 of Other Deferred Loyalty payments, net of the amount earned for the year ended December 31, 2024.

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NOTES TO CONSOLIDATED FINANCIAL STATEMENTS

(Dollars in thousands, except per share and share amounts)

4. EARNINGS PER SHARE

The following table shows the computation of basic and diluted earnings per share:

	Year Ended December 31,
	2024		2023		2022
Net Income	$	52,903	$	72,181	$	17,676
Denominator:
Weighted Average Common Shares Outstanding - Basic	52,908,322		55,507,144		57,951,955
Dilutive effect of Stock Options, RSUs and Warrants	2,147,575		3,017,508		3,094,640
Weighted Average Common Shares Outstanding - Diluted	55,055,897		58,524,652		61,046,595
Basic earnings per share	$	1.00	$	1.30	$	0.31
Diluted earnings per share	$	0.96	$	1.23	$	0.29

The Company has excluded 4,646,754 of stock options, RSUs and warrants that would have had an anti-dilutive effect on its diluted earnings per share calculation for the year ended December 31, 2024. The Company's anti-dilutive shares for the years ended December 31, 2023 and 2022 were not material to the Consolidated Financial Statements.

5. AIRCRAFT

As of December 31, 2024, Sun Country's fleet consisted of 63 Boeing 737-NG aircraft, comprised of 58 Boeing 737-800s and five Boeing 737-900ERs.

The following tables summarize the Company’s aircraft fleet activity for the years ended 2024 and 2023, respectively:

	December 31, 2023	Additions	Reclassifications	Removals	December 31, 2024
Passenger:
Owned	29	1	4	—	34
Finance leases	13	1	(3)	—	11
Sun Country Airlines' Fleet	42	2	1	—	45
Cargo:
Aircraft Operated for Amazon	12	—	—	—	12
Other:
Owned Aircraft Held for Operating Lease	5	—	(1)	—	4
Subleased Aircraft (1)	1	1	—	—	2
Total Aircraft Operated	60	3	—	—	63

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NOTES TO CONSOLIDATED FINANCIAL STATEMENTS

(Dollars in thousands, except per share and share amounts)

	December 31, 2022	Additions	Reclassifications	Removals	December 31, 2023
Passenger:
Owned	29	1	—	(1)	29
Finance leases	11	—	2	—	13
Operating leases	2	—	(2)	—	—
Sun Country Airlines' Fleet	42	1	—	(1)	42
Cargo:
Aircraft Operated for Amazon	12	—	—	—	12
Other:
Owned Aircraft Held for Operating Lease	—	5	—	—	5
Subleased Aircraft (1)	—	1	—	—	1
Total Aircraft Operated	54	7	—	(1)	60		(1)	The head leases associated with these subleases are classified as finance leases.
---	---

During the year ended December 31, 2024, the Company acquired one incremental owned aircraft and took control of two aircraft through finance lease arrangements, one of which was subsequently subleased to the same unaffiliated airline to whom we subleased another aircraft during the year ended December 31, 2023. During the year ended December 31, 2024, amendments were executed to extend the lease expiry terms for both subleased aircraft through November 2025. Upon expiry of these subleases, both aircraft will be redelivered to the Company and are expected to be inducted into the Company's passenger fleet. Further, the Company purchased three aircraft previously classified as a finance lease, which are now unencumbered. Additionally, the Company accepted delivery of one of the Owned Aircraft Held for Operating Lease that was leased to an unaffiliated airline, which will be inducted into the passenger fleet. See Note 8 of these Consolidated Financial Statements for more information on this transaction. In January 2025, amendments were executed to extend the lease expiry terms for three of the four remaining Owned Aircraft Held for Operating Lease, which now expire over various dates through the fourth quarter of 2026. Of the 38 Owned aircraft and Owned Aircraft Held for Operating Lease as of December 31, 2024, 31 aircraft were financed and seven aircraft were unencumbered.

During the year ended December 31, 2023, the Company acquired five Boeing 737-900ERs that are currently on lease to an unaffiliated airline. The five Owned Aircraft Held for Operating Lease were financed through a term loan arrangement. Additionally, during the year ended December 31, 2023, the Company acquired one incremental aircraft and executed two lease amendments to purchase two aircraft at the end of their respective lease terms. The lease amendments modified the classification of these leases from operating leases to finance leases. During the year ended December 31, 2023, management retired one aircraft, the impact of which was not material. During the year ended December 31, 2023, the Company took control of one aircraft through a finance lease arrangement, which was subsequently subleased to an unaffiliated airline.

Depreciation, amortization, and rent expense on aircraft is as follows:

		Year Ended December 31,
Aircraft Status	Expense Type	2024		2023		2022
Owned	Depreciation	$	56,383	$	55,260	$	40,311
Finance Leased	Amortization	22,079		20,122		16,871
Operating Leased	Aircraft Rent (1)	—		2,281		8,768
		$	78,462	$	77,663	$	65,950

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NOTES TO CONSOLIDATED FINANCIAL STATEMENTS

(Dollars in thousands, except per share and share amounts)

_________________________________

(1)	Aircraft Rent expense includes credits for the amortization of over-market liabilities established at the Acquisition Date.

Depreciation expense on owned aircraft and amortization expense on finance leased aircraft are both classified in Depreciation and Amortization on the Consolidated Statements of Operations.

6. GOODWILL AND OTHER INTANGIBLE ASSETS

Components of Goodwill and Other Intangible Assets were as follows:

	December 31, 2024
	Gross Carrying <br>Amount		Accumulated <br>Amortization		Net Carrying <br>Value
Goodwill	$	222,223	$	—	$	222,223
Other Intangible Assets with Finite Lives:
Customer Relationships	48,000		(26,890)		21,110
Over-Market Asset	3,741		(3,013)		728
Other Intangible Assets with Indefinite Lives:
Tradename	56,000		—		56,000
Total Other Intangible Assets	107,741		(29,903)		77,838
Total Goodwill and Other Intangible Assets	$	329,964	$	(29,903)	$	300,061			December 31, 2023
---	---	---	---	---	---	---
	Gross Carrying <br>Amount		Accumulated <br>Amortization		Net Carrying <br>Value
Goodwill	$	222,223	$	—	$	222,223
Other Intangible Assets with Finite Lives:
Customer Relationships	48,000		(22,890)		25,110
Over-Market Asset	3,741		(1,300)		2,441
Other Intangible Assets with Indefinite Lives:
Tradename	56,000		—		56,000
Total Other Intangible Assets	107,741		(24,190)		83,551
Total Goodwill and Other Intangible Assets	$	329,964	$	(24,190)	$	305,774

The Company recognized $5,713, $5,300 and $4,000 of amortization expense on Other Intangible Assets with finite-lives during the years ended December 31, 2024, 2023 and 2022, respectively. During the years ended December 31, 2024 and 2023, $1,713 and $1,300 of the amortization expense on Other Intangible Assets with finite-lives is associated with the over-market asset amortization, respectively. The amortization expense associated with the over-market asset is recorded as contra revenue within Other Revenue on the Consolidated Statements of Operations.

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NOTES TO CONSOLIDATED FINANCIAL STATEMENTS

(Dollars in thousands, except per share and share amounts)

Estimated future annual amortization on the Company's Other Intangible Assets with Finite-Lives is as follows:

December 31	Annual Amortization of Other Intangible Assets with Finite-Lives
2025	$	4,728
2026	4,000
2027	4,000
2028	4,000
2029	4,000
Thereafter	1,110
Total	$	21,838

7. DEBT

Credit Facilities

On February 10, 2021, the Company executed the Credit Agreement with a group of lenders that replaced the Company’s prior $25,000 asset-based revolving credit facility. The Credit Agreement included a $25,000 Revolving Credit Facility and a $90,000 DDTL, which are collectively referred to as the “Credit Facilities". The interest rate on borrowings is determined by various alternative base rates plus an applicable margin ranging from 4% to 5%. In addition, there is a commitment fee on the unused Revolving Credit Facility of 0.5%. The proceeds from the Revolving Credit Facility can be used for general corporate purposes, whereas proceeds from the DDTL were to be used solely to finance the acquisition of aircraft or engines to be registered in the United States. Due to previous transactions involving the DDTL that were subsequently refinanced, no amounts under the DDTL were available to the Company as of December 31, 2024 and 2023. The Credit Agreement includes financial covenants that require a minimum trailing 12-month EBITDAR ($87,700 as of March 31, 2022 and beyond) and a minimum liquidity, as defined within the Credit Agreement, of $30,000 at the close of any business day. The Company was in compliance with these covenants as of December 31, 2024 and December 31, 2023.

As of December 31, 2024, the Company had $24,743 of financing available through the Revolving Credit Facility, as $257 had been pledged to support letters of credit.

Long-term Debt

Term Loan Credit Facility

During the year ended December 31, 2023, the Company executed a term loan credit facility with a face amount of $119,200 for the purpose of financing the five Owned Aircraft Held for Operating Lease. The loan is to be repaid monthly through March 2030. During the lease term, payments collected from the lessee will be applied directly to the repayment of principal and interest on the term loan credit facility. The Owned Aircraft Held for Operating Lease, as well as the related lease payments received from the lessee, are pledged as collateral. During the year ended December 31, 2023, the Company recorded $1,820 in debt issuance costs associated with the term loan credit facility.

The interest rate on the term loan credit facility is determined by using a base rate, which resets monthly, plus an applicable margin, and a fixed credit spread adjustment of 0.1%. The applicable margin during the lease term is fixed at 3.75%, and is subsequently reduced to 3.25% once the aircraft have been redelivered to the Company and a LTV ratio calculation is completed at the end of the lease term. To the extent that the LTV ratio exceeds 75% at the end of the lease term, a principal prepayment will be required in order to reduce the ratio to 75%. If at any point within 12 months of the end of the lease term for each respective aircraft the Company deems it probable that a principal prepayment will be required in order to reduce the LTV ratio to 75%, and such

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NOTES TO CONSOLIDATED FINANCIAL STATEMENTS

(Dollars in thousands, except per share and share amounts)

amount can be reasonably estimated, the estimated principal prepayment amount will be reclassified from Long-term Debt, net to Current Maturities of Long-Term Debt, net on the Company's Consolidated Balance Sheets. In the event a principal prepayment is required, amounts received under the end of lease maintenance compensation clause may be applied towards the prepayment.

During the fourth quarter of 2024, the lease term expired for one Owned Aircraft Held for Operating Lease. As of the lease term date, the LTV level was not in excess of the 75% LTV ratio. Therefore, a principal prepayment was not required to reduce the ratio. The interest rate in effect as of December 31, 2024, for the delivered aircraft was 7.7%.

In December 2024, the Company made a partial repayment of $60,000 on the term loan credit facility using proceeds from the reissued Class C trust certificates from the 2019-1 EETC. The Company recorded a $551 loss related to the $60,000 partial refinancing of the term loan credit facility.

As of December 31, 2024, four of the Owned Aircraft Held for Operating Lease were within 12 months of the end of its lease term. Due to the partial term loan repayment, the LTV level on these aircraft were not in excess of 75% as of December 31, 2024. The interest rate in effect for the Owned Aircraft Held for Operating Lease as of December 31, 2024 was 8.2%.

Pass-Through Trust Certificates

During March 2022, the Company arranged for the issuance of the 2022-1 EETC in an aggregate face amount of $188,277 for the purpose of financing or refinancing 13 aircraft. The Company is required to make bi-annual principal and interest payments each March and September, through March 2031. These notes bear interest at an annual rate between 4.84% and 5.75%. The weighted average interest rate was 5.05% as of December 31, 2024.

In December 2019, the Company arranged for the issuance of the 2019-1 EETC, in an aggregate face amount of $248,587 for the purpose of financing or refinancing 13 used aircraft, which was completed in 2020. The Company is required to make bi-annual principal and interest payments on the 2019-1 EETC each June and December, through December 2027. These notes bear interest at an annual rate between 4.13% and 7.10%. The weighted average interest rate was 5.35% as of December 31, 2024.

In December 2024, the Company reissued Class C trust certificates from the 2019-1 EETC, which had previously been repaid, in an aggregate face amount of $60,000 and concurrently applied the proceeds to repay a portion of the term loan credit facility. The reissued Class C trust certificates had no impact on the bi-annual payment schedule or the term of the 2019-1 EETC.

Long-term Debt includes the following:

	December 31,
	2024		2023
2019-1 EETC (see terms and conditions above)	$	158,510	$	138,423
2022-1 EETC (see terms and conditions above)	138,532		158,775
Term Loan Credit Facility (see terms and conditions above)	33,080		108,442
Total Debt	330,122		405,640
Less: Unamortized debt issuance costs	(3,000)		(3,995)
Less: Current Maturities of Long-term Debt, net	(87,579)		(74,177)
Total Long-term Debt, net	$	239,543	$	327,468

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NOTES TO CONSOLIDATED FINANCIAL STATEMENTS

(Dollars in thousands, except per share and share amounts)

Future maturities of the outstanding Debt are as follows:

December 31	Debt Principal<br>Payments		Amortization of Debt<br>Issuance Costs		Net Debt
2025	$	88,682	$	(1,103)	$	87,579
2026	61,703		(803)		60,900
2027	88,636		(590)		88,046
2028	22,620		(260)		22,360
2029	30,972		(155)		30,817
Thereafter	37,509		(89)		37,420
Total	$	330,122	$	(3,000)	$	327,122

The fair value of Debt was $311,103 and $383,061 as of December 31, 2024 and 2023, respectively. The fair value of the Company’s debt was based on the discounted amount of future cash flows using the Company’s end-of-period estimated incremental borrowing rate for similar obligations. The estimates were primarily based on Level 3 inputs.

8. LEASES

Lessee and Sublease Arrangements

The Company classifies its Leases into three categories: Aircraft, Real Estate, and Other. Aircraft leases consist of aircrafts, engines, and aircraft equipment under lease agreements. As of December 31, 2024, the Company had 13 leases for aircraft, all of which were under finance leases. Real estate leases consist of leased hangar and headquarter facilities, a simulator housing facility, and other leases consist of non-aircraft equipment under operating lease agreements. Real estate and other leases generally have initial terms of up to ten years.

The Company’s Cargo fleet of 12 aircraft is subleased directly from Amazon and the Company operates them pursuant to the A&R ATSA. The sublease arrangement does not qualify as a lease, because the Company does not control the use of the aircraft. As such, no right-of-use asset and lease liability is recognized in these financial statements for the Amazon arrangement. This conclusion is unchanged from the original ATSA. For more information on the A&R ATSA, see Note 2 within these Consolidated Financial Statements.

As of December 31, 2024 the Company had two subleased aircraft which are classified as operating leases. These sublease arrangements do not relieve the Company of its primary lease obligations with the lessor (the "head lease"). Therefore, the Company continues to account for the head leases as finance leases. The Company is entitled to fixed payments over the remaining lease terms, with additional variable lease payments based on aircraft utilization. The subleases expire in November 2025. The aircraft will be delivered to Sun Country on the sublease expiry dates and the aircraft will continue to be leased by the Company. The aircraft are expected to be inducted into the Company's fleet upon redelivery. The rental revenue associated with the sublease is recognized as it is earned and is included in Other Revenue. As of December 31, 2024, future undiscounted cash flows of $6,800 are expected to be received in 2025.

The Company also has various airport terminal agreements which include provisions for variable lease payments which are based on several factors, including, but not limited to, number of carriers, enplaned passengers, and airports’ annual operating budgets. Due to the variable nature of the rates, these leases are not recorded on the Company’s Consolidated Balance Sheets as a right-of-use asset and lease liability.

Certain aircraft lease agreements grant the Company the option to purchase the aircraft at the end of the lease term. To the extent the Company is reasonably certain to exercise the purchase option, the lease arrangement has been accounted for as a finance lease with the purchase option price recognized as part of the lease obligation.

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NOTES TO CONSOLIDATED FINANCIAL STATEMENTS

(Dollars in thousands, except per share and share amounts)

Lessor Arrangements

During the year ended December 31, 2023, the Company acquired five Owned Aircraft Held for Operating Lease. The Company obtained outright ownership of these aircraft upon purchase and assumed the position of lessor until the end of the related aircraft lease terms. The Company is entitled to fixed payments over the remaining lease term for each aircraft, which expire at various dates through the fourth quarter of 2025. On each lease expiry date, the Owned Aircraft Held for Operating Lease will be redelivered to Sun Country and are expected to be inducted into the Company’s fleet. The rental revenue associated with the Owned Aircraft Held for Operating Lease is recognized as it is earned and is included in Other Revenue. The Company recognized $23,380 and $17,689 of rental revenue during the years ended December 31, 2024 and 2023, respectively. As of December 31, 2024, future undiscounted cash flows of $10,026 are expected to be received in 2025.

In January 2025, amendments were executed to extend the lease expiry terms for three of the four remaining Owned Aircraft Held for Operating Lease, which now expire over various dates through the fourth quarter of 2026. As a result, future undiscounted cash flows of $14,316 and $3,630 are expected to be received in 2025 and 2026, respectively.

Upon acquisition of the Owned Aircraft held for Operating Lease, the Company recognized a Maintenance Rights Asset associated with the acquired leases. During the fourth quarter of 2024, the lease term for one of the Owned Aircraft Held for Operating Lease ended. Based on the maintenance condition of the aircraft on the lease return date, the Maintenance Rights Asset settlement resulted in capitalized asset improvements of $5,054 and end of lease compensation revenue in excess of the Maintenance Rights Asset of $2,849. The end of lease compensation revenue is a result of the combined value of the maintenance condition of the aircraft and the cash received from the lessee as end of lease compensation, exceeding the original amount recognized for the Maintenance Rights Asset. The end of lease compensation revenue was recognized within Other Revenue on the Company’s Consolidated Statement of Operations. For more information on the Maintenance Rights Asset and related accounting, see Note 2 included within these Consolidated Financial Statements.

The following table summarizes the lease-related assets and liabilities recorded on the Company’s Consolidated Balance Sheets:

		December 31,
	Classification	2024		2023
Assets
Finance lease assets, net	Property and Equipment, net	$	234,960	$	243,060
Operating lease assets	Operating Lease Right-of-use Assets	16,896		14,917
Owned Aircraft and Flight Equipment Held for Operating Lease	Property and Equipment, net	113,535		147,584
Total lease assets		$	365,391	$	405,561
Liabilities
Current:
Finance lease liabilities	Short-term Finance Lease Obligations	$	20,175	$	44,756
Operating lease liabilities	Short-term Operating Lease Obligations	3,281		2,219
Long-term:
Finance lease liabilities	Long-term Finance Lease Obligations	251,087		232,546
Operating lease liabilities	Long-term Operating Lease Obligations	17,369		16,611
Total lease liabilities		$	291,912	$	296,132

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(Dollars in thousands, except per share and share amounts)

The following table provides details of the Company’s obligations under Finance and Operating Leases as of December 31, 2024:

	Finance Leases						Operating Leases
Year Ending December 31	Aircraft		Real Estate		Total			Real Estate and Other
2025	$	36,124	$	1,773	$	37,897		$	4,771
2026	76,132		1,773		77,905			4,819
2027	26,724		1,773		28,497			4,806
2028	44,232		1,773		46,005			4,844
2029	87,153		1,404		88,557			2,922
Thereafter	58,418		—		58,418			3,428
Total Minimum Lease Payments	328,783		8,496		337,279			25,590
Less: Amount Representing Interest	(64,205)		(1,812)		(66,017)			(4,940)
Present Value of Minimum Lease Payments	264,578		6,684		271,262			20,650
Less: Short-term Obligations	(19,037)		(1,138)		(20,175)			(3,281)
Long-term Lease Obligations	$	245,541	$	5,546	$	251,087		$	17,369

The following table presents lease costs related to the Company’s Finance and Operating Leases:

		Year Ended December 31,
	Classification	2024		2023		2022
Finance lease cost
Amortization of leased assets	Depreciation and Amortization	$	23,108	$	21,150	$	17,900
Interest on lease liabilities	Interest Expense	19,568		16,325		13,782
Operating lease cost
Included in ROU asset - Aircraft	Aircraft Rent (1)	—		2,210		8,465
Included in ROU asset - Real Estate & Other	Ground Handling, Landing Fees and Airport Rent & Other Operating	4,644		4,438		3,692
Short-term	Aircraft Rent	—		396		691
Variable - Aircraft	Aircraft Rent (1)	—		(325)		(388)
Variable - Other	Landing Fees & Airport Rentals	2,691		2,212		1,838
Sublease Income	Other Revenue	(16,091)		(768)		—
Total Lease cost		$	33,920	$	45,638	$	45,980

_________________________________

1)	The years ended December 31, 2023 and 2022 included credits of $723 and $3,228, respectively, for the amortization of Over-market Liabilities established at the Acquisition Date related to lease rates and maintenance reserves. As of December 31, 2023, the balance of Over-market liabilities was $0.

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NOTES TO CONSOLIDATED FINANCIAL STATEMENTS

(Dollars in thousands, except per share and share amounts)

The following table presents Supplemental cash flow information related to leases, included in the Consolidated Statements of Cash Flows:

	Year Ended December 31,
	2024		2023		2022
Cash paid for amounts included in the measurement of lease liabilities:
Operating Cash Flows for Operating Leases	$	3,888	$	5,971	$	12,378
Operating Cash Flows for Finance Leases	$	19,568	$	16,325	$	13,782
Financing Cash Flows for Finance Leases	$	45,942	$	21,883	$	42,062

The table below presents lease-related terms and discount rates related to the Company’s Finance and Operating Leases:

	Year Ended December 31,
	2024	2023	2022
Weighted-average remaining lease term
Operating Leases	5.6 years	6.8 years	5.9 years
Finance Leases	4.4 years	4.9 years	6.1 years
Weighted-average discount rates
Operating Leases	7.8%	6.5%	6.3%
Finance Leases	6.8%	6.6%	6.2%

During the years ended December 31, 2023, and 2022 the Company expensed $620 and $2,191 of maintenance reserve payments, respectively. These expenses are reflected in Aircraft Rent on the accompanying Consolidated Statements of Operations. During the year ended December 31, 2023, the composition of our aircraft fleet shifting from aircraft under operating leases to all owned aircraft or aircraft under finance leases. Accordingly, we did not expense any maintenance reserve payments during the year ended December 31, 2024 because all maintenance deposits are expected to be recoverable either through reimbursable maintenance events or through application towards the purchase of the aircraft.

9. STOCK-BASED COMPENSATION

In March 2021, the stockholders approved the Sun Country Airlines Holdings, Inc. 2021 Omnibus Incentive Plan (the “Plan”). The Plan authorizes that no more than 3,600,000 shares of Common Stock may be delivered in the aggregate pursuant to Awards granted under the Plan. An “Award” means any Incentive Stock Option, Nonqualified Stock Option, Stock Appreciation Right, Restricted Stock, RSU, Other Stock-Based Award, or Other Cash-Based Award granted under the Plan. As of December 31, 2024, there were 2,241,578 shares available for future grants under the Plan. Upon implementation of the Plan, grants under the October 2018 equity incentive plan ceased. Awards already issued under the 2018 plan are not impacted by the new Plan.

Stock compensation expense was $6,020, $9,274, and $2,774 during the years ended December 31, 2024, 2023 and 2022, respectively. During the years ended December 31, 2024, 2023 and 2022 there was a $45, $1,048 and $1,032 tax benefit recognized in income related to stock compensation expense. During the year ended December 31, 2023, all conditions associated with the time-based and performance-based options granted under the SCA Acquisition Holdings, LLC Amended and Restated Equity Incentive Plan were met. As a result, 100% of the remaining unvested time-based and performance-based stock options vested. Therefore, during the year ended December 31, 2023, the Company recognized an acceleration of stock-based compensation expense for the time-based and performance-based stock options totaling $2,960. There was $7,374 of total unrecognized compensation expense related to both the RSUs and PRSUs that are probable of

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NOTES TO CONSOLIDATED FINANCIAL STATEMENTS

(Dollars in thousands, except per share and share amounts)

vesting as of December 31, 2024. This unrecognized compensation is expected to be fully recognized over a weighted average period of approximately 1.7 years.

Time-Based Stock Options

The following table is a summary of the Company's time-based stock option activity:

	Time-Based Stock Options
	Number of<br>shares	Weighted<br>average<br>exercise<br>price per<br>share		Weighted<br>average<br>grant date<br>fair value per share		Weighted<br>average<br>remaining<br>contractual<br>term (years)	Aggregate Intrinsic Value (in thousands)
Outstanding as of December 31, 2021	1,653,943	$	7.57	$	3.22	7.2
Forfeited	(119,605)	20.09		8.03
Exercised	(177,816)	5.63		2.49
Outstanding as of December 31, 2022	1,356,522	$	6.72	$	2.89	6.1
Forfeited	(3,882)	28.24		11.80
Exercised	(89,542)	5.78		2.54
Outstanding as of December 31, 2023	1,263,098	$	6.72	$	2.93	5.2
Forfeited	(32,060)	15.17		6.69
Exercised	(132,837)	5.30		2.39
Outstanding, Exercisable and Vested as of December 31, 2024	1,098,201	$	6.65	$	2.88	4.2	$	9,304

All time-based stock options had vested as of December 31, 2024. All time-based stock options expire ten years after the grant date. The intrinsic value of stock options exercised in 2024, 2023 and 2022 was $1,060, $1,421 and $3,468, respectively.

Performance-Based Stock Options

The following table is a summary of the Company's performance-based stock option activity:

	Performance-Based Stock Options
	Number of<br>shares	Weighted<br>average<br>exercise<br>price per<br>share		Weighted<br>average<br>grant date<br>fair value per share		Weighted<br>average<br>remaining<br>contractual<br>term (years)	Aggregate Intrinsic Value (in thousands)
Outstanding as of December 31, 2021	3,636,771	$	7.10	$	1.53	7.2
Forfeited	(307,894)	14.13		4.43
Exercised	(150,344)	6.55		1.74
Outstanding as of December 31, 2022	3,178,533	$	6.45	$	1.83	6.1
Forfeited	(7,812)	25.54		9.76
Exercised	(372,567)	5.75		1.59
Outstanding as of December 31, 2023	2,798,154	$	6.49	$	1.84	5.1
Forfeited	(69,135)	15.17		3.39
Exercised	(257,501)	5.30		1.50
Outstanding, Exercisable and Vested as of December 31, 2024	2,471,518	$	6.37	$	1.83	4.1	$	21,257

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NOTES TO CONSOLIDATED FINANCIAL STATEMENTS

(Dollars in thousands, except per share and share amounts)

All performance-based stock options had vested as of December 31, 2024. The intrinsic value of performance-based stock options exercised in 2024, 2023 and 2022 was $2,097, $5,253 and $2,511, respectively. All performance-based stock options expire ten years after the grant date.

Time-Based Restricted Stock Units

	Time-Based Restricted Stock Units
	Number of<br>shares	Weighted<br>average<br>grant date<br>fair value per share
Outstanding as of December 31, 2021	4,679	$	40.60
Granted	248,025	20.44
Forfeited	(5,478)	23.04
Vested	(17,035)	25.87
Outstanding as of December 31, 2022	230,191	$	20.39
Granted	458,271	17.19
Forfeited	(54,751)	18.89
Vested	(198,967)	18.60
Outstanding as of December 31, 2023	434,744	$	18.03
Granted	509,366	13.76
Forfeited	(39,869)	15.85
Vested	(231,909)	18.15
Outstanding as of December 31, 2024	672,332	$	14.88

The Company measures compensation expense for grants of time-based RSUs using the Company's share price on the date of grant. The Company recognizes expense associated with the RSUs in an amount equal to the fair value on the date of the grant and on a straight-line basis over the requisite service period of the award. RSUs vest ratably over the term of the award, which is typically three years. The total fair value of restricted stock units vested was $4,209, $3,701 and $441 during the years ended December 31, 2024, 2023 and 2022, respectively.

Performance-Based Restricted Stock Units

	Performance-Based Restricted Stock Units
	Number of<br>shares	Weighted<br>average<br>grant date<br>fair value per share
Outstanding as of December 31, 2023	—	$	—
Granted	172,737	14.48
Forfeited	(2,692)	14.49
Outstanding as of December 31, 2024	170,045	$	14.48

The PRSUs are long-term incentive opportunities that represent the right to receive shares of the Company’s Common Stock based on the achievement of certain performance conditions over a three-year period. The Company measures compensation expense for grants of PRSUs using the Company's share price on the date of grant. The Company recognizes compensation expense for grants of PRSUs to the extent it is probable the performance condition(s) will be satisfied. Potential payouts range from 50%-150% of a target level.

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NOTES TO CONSOLIDATED FINANCIAL STATEMENTS

(Dollars in thousands, except per share and share amounts)

10. DEFINED CONTRIBUTION 401(k) PLAN

The Company has a 401(k) profit-sharing retirement plan covering substantially all employees. The plan allows employee contributions up to 50% of a participant’s eligible compensation, subject to limits established under the 401(k) plan and annual IRS elective deferral limits. The Company currently matches 100% of participants' contributions up to a maximum of 4% for non-pilot participants’ eligible compensation. Pursuant to the current pilot CBA, the Company was required to make non-discretionary contributions based on gross earnings of 13% in 2022, 14% in 2023, and 15% in 2024 and thereafter. Contributions are classified in Salaries, Wages, and Benefits on the Consolidated Statements of Operations.

The Company made 401(k) contributions as follows:

	Year Ended December 31,
	2024		2023		2022
Non-Discretionary	$	21,237	$	16,733	$	13,692
Discretionary	3,079		2,429		2,730
Total 401(k) Contributions	$	24,316	$	19,162	$	16,422

11. INVESTMENTS

A summary of debt securities by major security type:

	December 31, 2024
	Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses		Fair Value
Available-for-Sale Securities (1):
Corporate Debt Securities	$	53,452	$	22	$	(40)	$	53,434
U.S. Government Agency Securities	44,303		2		(103)		44,202
Total	$	97,755	$	24	$	(143)	$	97,636			December 31, 2023
---	---	---	---	---	---	---	---	---
	Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses		Fair Value
Available-for-Sale Securities (1):
Municipal Debt Securities	$	6,981	$	—	$	(5)	$	6,976
Corporate Debt Securities	59,222		76		(50)		59,248
U.S. Government Agency Securities	68,118		23		(125)		68,016
Total	$	134,321	$	99	$	(180)	$	134,240		(1)	The Company also holds Certificates of Deposit that are included in Investments on the Consolidated Balance Sheets totaling $6,417 and $6,887 as of December 31, 2024 and December 31, 2023, respectively.
---	---

As of December 31, 2024, the unrealized losses were the result of increases in market interest rates and were not the result of a deterioration in the credit quality of the securities. As of December 31, 2024, the Company believes that any unrealized losses will recover prior to the investment's conversion to cash.

12. FAIR VALUE MEASUREMENTS

Accounting standards define fair value as the exchange price that would be received for an asset or paid to transfer a liability (an exit price) in the principal or most advantageous market for the asset or liability in an orderly transaction between market participants on the measurement date. The standards also establish a fair

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NOTES TO CONSOLIDATED FINANCIAL STATEMENTS

(Dollars in thousands, except per share and share amounts)

value hierarchy, which requires an entity to maximize the use of observable inputs and minimize the use of unobservable inputs when measuring fair value. Under GAAP, there are three levels of inputs that may be used to measure fair value:

Level 1 - Quoted prices for identical assets or liabilities in active markets.

Level 2 - Observable inputs other than Level 1 prices, such as quoted prices for similar assets or liabilities in active markets; quoted prices for identical or similar assets or liabilities in markets that are not active; or other inputs that are observable or can be corroborated by observable market data for substantially the full term of the assets or liabilities.

Level 3 - Unobservable inputs that are supported by little or no market activity and that are significant to the fair value of the assets or liabilities.

The Company uses the following valuation methodologies for financial instruments measured at fair value on a recurring basis.

Financial Instruments – Financial instruments including Restricted Cash, Certificates of Deposit, Accounts Receivable, Accounts Payable and all other Current Liabilities have carrying values that approximate fair value.

Cash & Cash Equivalents – The carrying value of cash and cash equivalents approximates fair value. Fair values of cash equivalent instruments that do not trade on a regular basis in active markets are classified as Level 2.

Available-for-Sale Securities – Available-for-Sale investment securities include debt securities, such as municipal, corporate, and U.S. government agency notes. All of these investments are classified as Level 2 because they do not trade in active markets on a regular basis. The Company obtains its pricing per security from a third-party, which uses quoted market prices, when available, or other observable inputs for determination of fair value.

Non-Financial Assets – Certain assets are measured at fair value on a nonrecurring basis. The Company’s non-financial assets, which primarily consist of Property & Equipment, Goodwill and Other Intangible Assets are not required to be measured at fair value on a recurring basis and are reported at carrying value. However, on a periodic basis whenever events or changes in circumstances indicate that their carrying value may not be recoverable, non-financial assets are assessed for impairment and, if applicable, written down to fair value using significant unobservable inputs, classified as Level 3.

Debt – See Note 7 for more information on the Company's debt financings and related fair values.

The following table summarizes the assets measured at fair value on a recurring basis:

	December 31, 2024
	Level 1		Level 2		Level 3		Total
Cash & Cash Equivalents	$	83,219	$	—	$	—	$	83,219
Available-for-Sale Securities:
Corporate Debt Securities	—		53,434		—		53,434
U.S. Government Agency Securities	—		44,202		—		44,202
Total Available-for-Sale Securities	—		97,636		—		97,636
Certificates of Deposit	6,417		—		—		6,417
Total Assets Measured at Fair Value on a Recurring Basis	$	89,636	$	97,636	$	—	$	187,272

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NOTES TO CONSOLIDATED FINANCIAL STATEMENTS

(Dollars in thousands, except per share and share amounts)

	December 31, 2023
	Level 1		Level 2		Level 3		Total
Cash & Cash Equivalents	$	46,279	$	—	$	—	$	46,279
Available-for-Sale Securities:
Municipal Debt Securities	—		6,976		—		6,976
Corporate Debt Securities	—		59,248		—		59,248
U.S. Government Agency Securities	—		68,016		—		68,016
Total Available-for-Sale Securities	—		134,240		—		134,240
Certificates of Deposit	6,887		—		—		6,887
Total Assets Measured at Fair Value on a Recurring Basis	$	53,166	$	134,240	$	—	$	187,406

13. INCOME TAXES

The following table summarizes the significant components of the provision for income taxes from continuing operations:

	Year Ended December 31,
	2024		2023		2022
Current:
Federal	$	1,697	$	—	$	1,329
State and Local	547		92		84
Total Current Tax Expense	2,244		92		1,413
Deferred:
Federal	13,389		19,609		4,393
State and Local	1,038		2,277		500
Total Deferred Tax Expense	14,427		21,886		4,893
Total Income Tax Expense	$	16,671	$	21,978	$	6,306

The income tax provision differs from that computed at the federal statutory corporate tax rate as follows:

	Year Ended December 31,
	2024		2023		2022
Expected Provision at Federal Statutory Tax Rate	21.0	%	21.0	%	21.0	%
State Tax, net of Federal Impact	1.8	%	2.0	%	1.9	%
Stock Compensation Benefit	(0.1)	%	(1.1)	%	(4.3)	%
Tax Receivable Agreement	—	%	(0.1)	%	4.4	%
Executive Compensation Limitation	0.3	%	1.0	%	2.0	%
Other Permanent Adjustments	1.0	%	0.5	%	1.3	%
Effective Tax Rate	24.0	%	23.3	%	26.3	%

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NOTES TO CONSOLIDATED FINANCIAL STATEMENTS

(Dollars in thousands, except per share and share amounts)

The following table summarizes the significant components of the Company’s deferred taxes:

	December 31,
	2024		2023
Deferred Tax Assets:
Net Operating Loss	$	66,834	$	73,559
Finance Lease Obligations	42,840		36,602
Operating Lease Obligations	4,123		3,576
Goodwill and Other Intangible Assets	1,038		3,925
Loyalty Program Liabilities	3,258		3,105
Interest Expense Limitation	8,374		6,876
Other	10,241		6,526
Total Deferred Tax Assets	136,708		134,169
Deferred Tax Liabilities:
Accelerated Depreciation	(113,679)		(103,606)
Finance Lease Assets	(36,535)		(31,646)
Operating Lease Right-of-use Assets	(3,886)		(3,431)
Prepaid Maintenance	(4,135)		(3,476)
Other	(2,039)		(1,158)
Total Deferred Tax Liabilities	(160,274)		(143,317)
Total Net Deferred Tax (Liabilities) Assets	$	(23,566)	$	(9,148)

As of December 31, 2024, the Company has $64,263 of federal NOLs and $2,571 of state NOLs, net of tax effect, available that may be applied against future tax liabilities. As a result of ownership changes that occurred in 2021, the existing federal and state NOLs may be subject to certain limitations under Section 382 of the Internal Revenue Code. However, the Company does not believe these limitations will adversely impact its ability to use these losses to offset taxable income in future periods. There is no expiration of federal net operating losses. The state NOLs begin to expire in 2033.

In assessing the realizability of Deferred Tax Assets, management considers whether it is more likely than not that some portion or all the Deferred Tax Assets will not be realized. The ultimate realization of the Deferred Tax Assets is dependent upon the generation of future taxable income during periods in which the temporary differences become deductible. Management considers the scheduled reversal of the liabilities (including the impact of available carryback and carryforward periods), projected future taxable income, and tax-planning strategies in making this assessment. As of December 31, 2024, management believes that it is more likely than not that the future results of the operations will generate sufficient taxable income to realize the tax benefits related to its Deferred Tax Assets.

The Company recognizes the consolidated financial statement effect of a tax position when it is more likely than not, based on the technical merits, that the position will be sustained upon examination. If applicable, the Company reports both accrued interest and penalties related to unrecognized tax benefits as a component of Income Tax Expense in the Consolidated Statements of Operations. As of December 31, 2024 and 2023, the Company had no liability for unrecognized tax benefits recorded in its Consolidated Balance Sheets.

The Company files income tax returns in the United States and various states. In the normal course of business, the Company is subject to potential income tax examination by the federal and state tax authorities in these jurisdictions for tax years that are open under local statute. For U.S. federal income tax purposes, the

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NOTES TO CONSOLIDATED FINANCIAL STATEMENTS

(Dollars in thousands, except per share and share amounts)

Company's 2023, 2022, and 2021 tax returns remain open to examination. For U.S. state income tax purposes, the Company's 2023, 2022, 2021, and 2020 tax returns remain open to examination.

Tax Receivable Agreement

In connection with the Company’s IPO, the legal entity Sun Country Airlines Holdings, Inc. entered into a TRA with the TRA holders. Upon the closing of the IPO, the Company recognized a non-current liability of $115,200, which represented undiscounted aggregate payments that were expected to be paid to the TRA holders, with an offset to Stockholders’ Equity. The total TRA balance as of December 31, 2024 and 2023 was $97,694 and $101,044, of which $10,325 and $3,250 was current, respectively. The TRA liability is an estimate and actual amounts payable under the TRA could differ from this estimate. Payments will be made in future periods as the Pre-IPO Tax Attributes are utilized. If the Company does not generate sufficient taxable income in the aggregate over the term of the TRA to utilize the tax benefits, then it would not be required to make the related TRA payments. During the years ended December 31, 2024 and 2023, the Company made payments of $3,350 and $2,425, respectively, to the TRA holders, which includes certain members of the Company's management and certain members of the Company's Board of Directors. For more information on the TRA see Note 2 within these Consolidated Financial Statements.

14. STOCKHOLDERS’ EQUITY

The Company may purchase shares of its Common Stock on a discretionary basis from time-to-time through open market repurchases, privately negotiated transactions, accelerated share repurchase, or other means, including through Rule 10b5-1 trading plans. As of December 31, 2024, the Company did not have any remaining amount of Board authorization to repurchase shares of its Common Stock.

During the year ended December 31, 2024, the Company completed open market repurchases for 755,284 shares of its Common Stock at a total cost of $11,493 or an average price of $15.22 per share. During the year ended December 31, 2024, the Company accrued $32 of excise taxes related to stock repurchases in 2024 and made an excise tax payment of $641 for stock repurchases made in 2023.

Subsequent to December 31, 2024, the Company announced the commencement of a secondary public offering of 6,346,105 shares of its Common Stock by the SCA Horus Stockholder. Upon the completion of the secondary public offering, the SCA Horus Stockholder did not own any shares of the Company’s Common Stock. The Company did not receive any of the proceeds from the offering. The Company received authorization from its Board of Directors to repurchase up to $10,000 of its Common Stock in connection with this offering. The underwriters agreed to sell to the Company, and the Company agreed to purchase up to $10,000 of the Company's Common Stock from the underwriters equal to the price at which the underwriter purchased the shares from the SCA Horus Stockholder. As part of this transaction, the Company repurchased 630,914 shares of its Common Stock, for a total cost of $10,000, or an average price of $15.85 per share.

During the year ended December 31, 2023, the Company repurchased 4,213,975 shares of its Common Stock at a total cost of $68,585, or an average price of $16.28 per share. The repurchases were part of secondary public offerings of the Company's shares by the SCA Horus Stockholder, as well as open market purchases.

During the fourth quarter of 2022, the Company entered into a $25,000 Accelerated Share Repurchase Program. The Company received an initial delivery of 890,586 shares at an average price of $19.65 per share during the fourth quarter of 2022. The settlement of the program occurred during January 2023, upon which the Company received an additional 480,932 shares. In total, the Company repurchased 1,371,518 shares at an average price of $18.23 per share.

Amazon Agreement

On December 13, 2019, the Company signed a six-year contract with Amazon to provide Cargo services under the original ATSA. In connection with the original ATSA, the Company issued warrants to Amazon to purchase

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SUN COUNTRY AIRLINES HOLDINGS, INC.

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS

(Dollars in thousands, except per share and share amounts)

an aggregate of up to 9,482,606 shares of common stock at an exercise price of approximately $15.17 per share. The exercise period of these warrants is through the eighth anniversary of the issue date. There were 632,183 warrants that vested upon execution of the ATSA and 63,217 warrants will vest for each milestone of $8,000 in qualifying payments made by Amazon to the Company. During the years ended December 31, 2024, 2023 and 2022, total warrants vested were 885,042, 821,825 and 758,608, respectively. This resulted in Amazon holding 4,109,135 vested warrants as of December 31, 2024. No incremental warrants were issued, nor was the original warrant agreement modified, upon the signing of the A&R ATSA. For more information on the A&R ATSA, see Note 2 within these Consolidated Financial Statements.

15. COMMITMENTS AND CONTINGENCIES

The Company has contractual obligations and commitments primarily with regard to lease arrangements (see Note 8), repayment of debt (see Note 7), payments under the TRA (see Note 13), and probable future purchases of aircraft.

The Company is subject to an audit by the Internal Revenue Service (“IRS”) related to the collection of federal excise taxes on optional passenger seat selection charges covering the period of October 1, 2021 through June 30, 2023. During 2024, the Company received an assessment of approximately $2,700 from the IRS related to the results of the audit. The Company has appealed the results of the audit through a formal protest with the IRS. The Company believes a loss in this matter is not probable and has not recognized a loss contingency as of December 31, 2024.

As of December 31, 2024, the Company had surety bonds of approximately $2,148, primarily related to bond contractual performance.

The Company is subject to various legal proceedings in the normal course of business and expenses legal costs as incurred. Management does not believe these proceedings will have a materially adverse effect on the Company.

16. OPERATING SEGMENTS

Operating segments are defined as components of an enterprise about which separate financial information is both available and evaluated regularly by the CODM and is used in resource allocation and performance assessments. The Company’s CODM is considered to be the Company’s Chief Executive Officer. The Company has two operating and reportable segments: Passenger and Cargo, which are determined by the services provided and fleet utilized. The CODM makes resource allocation decisions with the objective of generating high returns and margins and mitigating the seasonality of the Company’s route network. The CODM assesses performance using multiple measures. Operating Income is the measure of segment profit that is the most consistent with the amounts presented in the Company’s Consolidated Financial Statements, as well as the measures the CODM uses to assess segment performance. The accounting policies for the Company’s reportable segments are consistent with those described in the Summary of Significant Accounting Policies included within Note 2 of these Consolidated Financial Statements. There are no intercompany transactions between the Company’s reportable segments.

The Company’s Passenger segment is comprised of two businesses: Scheduled Service and Charter. The Scheduled Service business provides passenger airline service primarily to leisure and VFR travelers. The Scheduled Service business offers a base fare and allows customers to purchase ancillary products and services for an additional fee. Sources of our ancillary revenue include air travel-related services such as baggage fees, seat selection and upgrade fees, priority check-in and boarding fees, other fees and on-board sales. The Charter business includes ad hoc, repeat, short-term and long-term service contracts. Under these Charter agreements, the Company is obligated to provide aircraft, crew, maintenance, and insurance for travel. Our diverse Charter customer base includes, but is not limited to the DoD, collegiate and professional sports teams and casinos.

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SUN COUNTRY AIRLINES HOLDINGS, INC.

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS

(Dollars in thousands, except per share and share amounts)

Both Scheduled Service and Charter utilize the Company's Passenger fleet. The CODM maximizes the return on these aircraft through the combination of both the Scheduled Service and Charter flights. This allows for the most profitable use of the aircraft, either Scheduled Service or Charter, to be selected at any point in time. The Company routinely schedules its Passenger fleet using what is referred to as “Power Patterns,” which involves scheduling aircraft and crew on trips that combine Scheduled Service and Charter legs, dynamically replacing what would be lower margin Scheduled Service flights with Charter opportunities. The Company determined that it was appropriate that these businesses be viewed as a singular Passenger operating segment as the CODM evaluates the combined financial results of these businesses, due to their complimentary nature, to ensure the highest levels of returns for the Passenger fleet. Operating revenues for the Passenger segment also includes amounts recorded within Other Revenue. This is in line with how the CODM regularly reviews results and allocates resources.

The Cargo segment began providing CMI service under the ATSA in May 2020. In June 2024, the Company entered into the A&R ATSA with Amazon. The CMI service is asset-light, as Amazon supplies the aircraft under the A&R ATSA. Currently, Amazon is our only CMI customer. The Company is responsible for flying the aircraft under its air carrier certificate, crew, aircraft line maintenance and insurance. Fuel consumed in Cargo operations is directly reimbursed by Amazon and therefore aircraft fuel revenue is presented net of such reimbursements on the Consolidated Statements of Operations. Fuel consumed in Cargo maintenance activities is included within Aircraft Fuel expense in the Cargo segment. Certain operating expenses are directly attributable to the Cargo operating segment.

Certain operating expenses are allocated between the Passenger and Cargo segments. Non-Fuel operating expenses are allocated based on metrics such as block hours, fleet count and departures, which best align with the nature of the respective expense. Other Operating, net includes crew and other employee travel, interrupted trip expenses, information technology, property taxes and insurance, including hull-liability insurance, supplies, legal and other professional fees, facilities and all other administrative and operational overhead expenses. The CODM does not consider Interest Income, Interest Expense, and Other Income, net, in assessing the financial performance of its operating segments. Collectively, these items are included in reconciliations of reporting segment financial amounts to consolidated financial amounts.

The following tables present financial information for the Company’s two segments. Primarily all of the Company’s long-lived assets are owned by, or associated with, the Passenger operating segment. Therefore, predominately all depreciation and amortization expense is associated with the Passenger operating segment. Substantially all the Company’s tangible assets are located in the U.S. The Company's Aircraft and Flight equipment is mobile across geographic markets. As a result, assets by segment are not reviewed by the CODM and have not been presented herein.

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SUN COUNTRY AIRLINES HOLDINGS, INC.

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS

(Dollars in thousands, except per share and share amounts)

	Year Ended December 31, 2024
	Passenger		Cargo		Total
Operating Revenues	$	968,565	$	107,174	$	1,075,739
Operating Expenses:
Aircraft Fuel	237,108		52		237,160
Salaries, Wages, and Benefits	255,887		70,888		326,775
Maintenance	54,619		14,151		68,770
Sales and Marketing	34,935		—		34,935
Depreciation and Amortization	94,971		18		94,989
Ground Handling	42,102		16		42,118
Landing Fees and Airport Rent	58,951		598		59,549
Other Operating, net	85,199		20,258		105,457
Total Operating Expenses	863,772		105,981		969,753
Operating Income	$	104,793	$	1,193	105,986
Interest Income					7,833
Interest Expense					(44,300)
Other, net					55
Income Before Income Tax					$	69,574			Year Ended December 31, 2023
---	---	---	---	---	---	---
	Passenger		Cargo		Total
Operating Revenues	$	949,885	$	99,735	$	1,049,620
Operating Expenses:
Aircraft Fuel	246,600		69		246,669
Salaries, Wages, and Benefits	225,744		69,896		295,640
Aircraft Rent	2,281		—		2,281
Maintenance	46,211		14,377		60,588
Sales and Marketing	34,105		—		34,105
Depreciation and Amortization	88,098		53		88,151
Ground Handling	37,506		—		37,506
Landing Fees and Airport Rent	49,175		440		49,615
Other Operating, net	87,293		20,272		107,565
Total Operating Expenses	817,013		105,107		922,120
Operating Income (Loss)	$	132,872	$	(5,372)	127,500
Interest Income					10,180
Interest Expense					(42,634)
Other, net					(887)
Income Before Income Tax					$	94,159

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SUN COUNTRY AIRLINES HOLDINGS, INC.

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS

(Dollars in thousands, except per share and share amounts)

	Year Ended December 31, 2022
	Passenger		Cargo		Total
Operating Revenues	$	804,094	$	90,350	$	894,444
Operating Expenses:
Aircraft Fuel	268,279		84		268,363
Salaries, Wages, and Benefits	189,134		56,721		245,855
Aircraft Rent	8,768		—		8,768
Maintenance	33,293		13,311		46,604
Sales and Marketing	31,053		—		31,053
Depreciation and Amortization	67,530		111		67,641
Ground Handling	33,808		8		33,816
Landing Fees and Airport Rent	45,234		424		45,658
Other Operating, net	71,148		19,830		90,978
Total Operating Expenses	748,247		90,489		838,736
Operating Income (Loss)	$	55,847	$	(139)	55,708
Interest Income					4,527
Interest Expense					(31,018)
Other, net					(5,235)
Income Before Income Tax					$	23,982

17. PARENT COMPANY FINANCIAL STATEMENTS

Basis of Presentation

These Condensed Parent Company Financial Statements have been prepared in accordance with Rule 12-04, Schedule I of Regulation S-X, as the restricted net assets of the subsidiary of Sun Country Airlines Holdings, Inc. (herein also referred to as the "Parent"), as defined in Rule 4-08(e)(3) of Regulation S-X, exceed 25% of the consolidated net assets of the Company. These Condensed Parent Company Financial Statements are not general-purpose financial statements and should be read in conjunction with the Consolidated Financial Statements.

Sun Country Airlines Holdings, Inc. is the parent company of Sun Country, Inc. ("Subsidiary"), which is a certificated air carrier. Sun Country Airlines Holdings, Inc. is a holding company that does not conduct any business operations of its own. As a result, the Parent is dependent upon cash dividends and distributions and other transfers from its Subsidiary to meet obligations. The ability of Sun Country Holdings, Inc.’s operating Subsidiary to pay dividends is restricted due to terms of the Credit Agreement, as defined in Note 7, which was negotiated with the Subsidiary. The covenants of the Credit Agreement place an annual limit on the amount of dividends the Subsidiary can pay Sun Country Holdings, Inc., as calculated using six percent of the Company's market capitalization plus the greater of $10,000 or 10% of EBITDAR. There are no significant limitations on Sun Country Airlines Holdings, Inc.'s ability to direct the Subsidiary to make periodic payments under the TRA.

The Parent’s significant accounting policies are consistent with those described in the Consolidated Financial Statements, except that the Subsidiary is accounted for as an equity method investment.

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SUN COUNTRY AIRLINES HOLDINGS, INC.

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS

(Dollars in thousands, except per share and share amounts)

The following Condensed Parent Company Financial Statements are presented to show only the parent company, Sun Country Airlines Holdings, Inc.

Balance Sheets

	December 31,
	2024		2023
ASSETS
Current Assets:
Cash and Cash Equivalents	$	—	$	—
Total Current Assets	—		—
Other Assets:
Investment in Subsidiary	668,067		615,447
Total Other Assets	668,067		615,447
Total Assets	$	668,067	$	615,447			December 31,
---	---	---	---	---
	2024		2023
LIABILITIES AND STOCKHOLDERS' EQUITY
Current Liabilities:
Income Tax Receivable Agreement Liability	$	10,325	$	3,250
Total Current Liabilities	10,325		3,250
Income Tax Receivable Agreement Liability	87,369		97,794
Total Liabilities	97,694		101,044
Stockholders' Equity:
Common Stock	595		589
Treasury Stock	(105,866)		(94,341)
Additional Paid In Capital	528,604		513,988
Retained Earnings	147,132		94,229
Accumulated Other Comprehensive Loss	(92)		(62)
Total Stockholders' Equity	570,373		514,403
Total Liabilities and Stockholders' Equity	$	668,067	$	615,447

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SUN COUNTRY AIRLINES HOLDINGS, INC.

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS

(Dollars in thousands, except per share and share amounts)

Statements of Operations

	Year Ended December 31,
	2024		2023		2022
Operating Expenses:
Other Operating, net	$	823	$	659	$	465
Total Operating Expenses	823		659		465
Operating Loss	(823)		(659)		(465)
Non-operating Income (Expense), net:
Equity in Income of Subsidiary	53,726		72,509		23,141
Income Tax Receivable Agreement Adjustment	—		331		(5,000)
Total Non-operating Income, net	53,726		72,840		18,141
Income before Income Tax	52,903		72,181		17,676
Income Tax Expense	—		—		—
Net Income	52,903		72,181		17,676
Other Comprehensive Income (Loss)	(30)		745		(807)
Comprehensive Income	$	52,873	$	72,926	$	16,869

A Statement of Cash Flows has not been presented as Sun Country Airlines Holdings, Inc. did not have material cash transactions for the years ended December 31, 2024, 2023, and 2022. Further, Sun Country Airlines Holdings, Inc. did not have material cash balances as of December 31, 2024 and 2023. All cash transactions involving Sun Country Airlines Holdings, Inc. are performed at the Subsidiary level.

During the years ended December 31, 2024, 2023 and 2022 Sun Country Airlines Holdings, Inc. directed the Subsidiary to repurchase the Parent's Common Stock and make a payment to the TRA holders. For more information on these transactions see Note 13 and Note 14 within these Consolidated Financial Statements. These transactions have been recorded as non-cash dividends from the Subsidiary to the Parent.

18. SUBSEQUENT EVENTS

The Company evaluated subsequent events for the period from the Balance Sheet date through February 12, 2025, the date that the Consolidated Financial Statements were available to be issued.

Subsequent to December 31, 2024, the Company announced the commencement of a secondary public offering of 6,346,105 shares of its Common Stock by the SCA Horus Stockholder. Upon the completion of the secondary public offering, the SCA Horus Stockholder did not own any shares of the Company’s Common Stock. The Company did not receive any of the proceeds from the offering. The Company received authorization from its Board of Directors to repurchase up to $10,000 of its Common Stock in connection with this offering. The underwriters agreed to sell to the Company, and the Company agreed to purchase up to $10,000 of the Company's Common Stock from the underwriters equal to the price at which the underwriter purchased the shares from the SCA Horus Stockholder. As part of this transaction, the Company repurchased 630,914 shares of its Common Stock, for a total cost of $10,000, or an average price of $15.85 per share.

***

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ITEM 9: CHANGES IN THE DISAGREEMENTS WITH ACCOUNTANTS ON ACCOUNTING AND FINANCIAL DISCLOSURE

None.

ITEM 9A. CONTROLS AND PROCEDURES

Evaluation of Disclosure Controls and Procedures

Disclosure controls and procedures are controls and other procedures that are designed to ensure that information required to be disclosed in our reports filed or submitted under the Exchange Act, is recorded, processed, summarized, and reported within the time periods specified in the SEC’s rules and forms. Disclosure controls and procedures include, without limitation, controls and procedures designed to ensure that information required to be disclosed in our reports filed or submitted under the Exchange Act is accumulated and communicated to our Management, including our Chief Executive Officer and Chief Financial Officer, to allow timely decisions regarding required disclosure.

Our management, with the participation of our Chief Executive Officer and Chief Financial Officer, has evaluated the effectiveness of the design and operation of our disclosure controls and procedures (as defined in Rules 13a-15(e) and 15d-15(e) under the Exchange Act) as of the end of the period covered by this Annual Report.

Based on the evaluation of our disclosure controls and procedures as of December 31, 2024, our Chief Executive Officer and Chief Financial Officer have concluded that our disclosure controls and procedures were effective as of the end of the period covered by this Annual Report.

Management's Annual Report on Internal Controls Over Financial Reporting

Our management is responsible for establishing and maintaining adequate internal control over financial reporting. Internal control over financial reporting is a process designed to provide reasonable assurance regarding the reliability of financial reporting and the preparation of financial statements for external reporting purposes in accordance with U.S. generally accepted accounting principles (GAAP). Internal control over financial reporting includes policies and procedures that, (1) pertain to the maintenance of records that, in reasonable detail, accurately and fairly reflect transactions and disposition of assets; (2) provide reasonable assurance that transactions are recorded as necessary to permit preparation of financial statements in accordance with GAAP, and that receipts and expenditures are being made only in accordance with the authorization of its management and directors; and (3) provide reasonable assurance regarding the prevention or timely detection of unauthorized acquisition, use, or disposition of our assets that could have a material effect on its financial statements.

Because of its inherent limitations, internal control over financial reporting may not prevent or detect misstatements. In addition, projections of any evaluation of effectiveness to future periods are subject to the risk that controls may become inadequate because of changes in conditions or that the degree of compliance with the policies or procedures may deteriorate.

Our management has assessed the effectiveness of our internal control over financial reporting as of December 31, 2024. Management based its assessment on criteria established by the COSO in Internal Control - Integrated Framework (2013). Management’s assessment included evaluation of criteria in the areas of control environment, risk assessment, control activities, information and communication, and monitoring. Management’s assessment included extensive documentation, evaluating and testing the design and operating effectiveness of its internal controls over financial reporting. Management has assessed the effectiveness of our internal control over financial reporting as of December 31, 2024 and has concluded that such internal controls over financial reporting were effective.

The Company’s independent registered public accounting firm has audited the Company’s internal control over financial reporting as of December 31, 2024, as stated in the Report of Independent Registered Public Accounting Firm, appearing under Item 8.

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Changes in Internal Control Over Financial Reporting

There have been no changes in the Company’s internal control over financial reporting (as defined in Rules 13a-15(f) and 15d-15(f) under the Exchange Act) that occurred during the quarter ended December 31, 2024 that have materially affected, or are reasonably likely to materially affect, our internal control over financial reporting.

ITEM 9B: OTHER INFORMATION

Our directors and executive officers may purchase or sell shares of our common stock in the market from time to time, including pursuant to equity trading plans adopted in accordance with Rule 10b5-1 under the Exchange Act ("Rule 10b5-1") and in compliance with guidelines specified by the Company. In accordance with Rule 10b5-1 and the Company’s insider trading policy, directors, officers and certain employees who, at such time, are not in possession of material non-public information about the Company are permitted to enter into written plans that pre-establish amounts, prices and dates (or formula for determining the amounts, prices and dates) of future purchases or sales of the Company’s stock, including shares acquired pursuant to the Company’s equity plans ("Rule 10b5-1 Trading Plans"). Under a Rule 10b5-1 Trading Plan, a broker executes trades pursuant to parameters established by the director or executive officer when entering into the plan, without further direction from them. During the three months ended December 31, 2024, our directors and executive officers did not adopt, terminate, or modify any instructions or written plans for the sale or purchase of our securities that would be intended to satisfy the affirmative defense conditions of Rule 10b5-1(c).

ITEM 9C. DISCLOSURE REGARDING FOREIGN JURISDICTIONS THAT PREVENT INSPECTIONS

Not Applicable.

PART III

ITEM 10: DIRECTORS, EXECUTIVE OFFICERS AND CORPORATE GOVERNANCE

The information required by this Item is incorporated herein by reference to the data under the headings “Proposal 1 – Election of Directors,” “Executive Officers,” “Corporate Governance” and “Delinquent Section 16(a) Reports” in the Proxy Statement.

ITEM 11: EXECUTIVE COMPENSATION

The information required by this Item is incorporated herein by reference to the data under the headings “Executive Compensation” and “Corporate Governance” in the Proxy Statement.

ITEM 12: SECURITY OWNERSHIP OF CERTAIN BENEFICIAL OWNERS AND MANAGEMENT AND RELATED STOCKHOLDER MATTERS

The information required by this Item is incorporated herein by reference to the data under the heading “Security Ownership of Certain Beneficial Owners and Management” in the Proxy Statement. The information required by this item with respect to securities authorized for issuance under our equity compensation plans is included in Part II, Item 5 of this Annual Report.

ITEM 13: CERTAIN RELATIONSHIPS AND RELATED TRANSACTIONS AND DIRECTOR INDEPENDENCE

The information required by this Item is incorporated herein by reference to the data under the heading “Certain Relationships and Related Person Transactions” in the Proxy Statement.

ITEM 14: PRINCIPAL ACCOUNTANT FEES AND SERVICES

The information required by this Item is incorporated herein by reference to the data under the heading “Audit Fees, Audit-Related Fees, Tax Fees and All Other Fees” in the Proxy Statement.

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PART IV

ITEM 15: EXHIBITS AND FINANCIAL STATEMENT SCHEDULES

(a)Exhibits

Exhibit Number	Exhibit Description
3.1	Second Amended and Restated Certificate of Incorporation of Sun Country Airlines Holdings, Inc. (incorporated by reference to Exhibit 3.1 to Sun Country Airlines Holdings, Inc.’s Registration Statement on Form S-8 (File No. 333-254371))
3.2	Second Amended and Restated Bylaws of Sun Country Airlines Holdings, Inc. (incorporated by reference to Exhibit 3.2 to Sun Country Airlines Holdings, Inc.’s Registration Statement on Form S-8 (File No. 333-254371))
4.1	Pass Through Trust Agreement, dated as of December 9, 2019, between Sun Country Inc. and Wilmington Trust, National Association, as trustee (incorporated by reference to Exhibit 4.1 to Sun Country Airlines Holdings, Inc.’s Registration Statement on Form S-1 (File No. 333-252858))
4.2	Form of Pass Through Trust Certificate, Series 2019-1A (incorporated by reference to Exhibit 4.2 to Sun Country Airlines Holdings, Inc.’s Registration Statement on Form S-1 (File No. 333-252858))
4.3	Form of Pass Through Trust Certificate, Series 2019-1B (incorporated by reference to Exhibit 4.3 to Sun Country Airlines Holdings, Inc.’s Registration Statement on Form S-1 (File No. 333-252858))
4.4	Form of Pass Through Trust Certificate, Series 2019-1C (incorporated by reference to Exhibit 4.4 to Sun Country Airlines Holdings, Inc.’s Registration Statement on Form S-1 (File No. 333-252858))
4.5	Intercreditor Agreement, dated as of December 9, 2019, among Wilmington Trust, National Association, as trustee of the Sun Country Pass Through Trusts, Series 2019-1, and as subordination agent (incorporated by reference to Exhibit 4.5 to Sun Country Airlines Holdings, Inc.’s Registration Statement on Form S-1 (File No. 333-252858))
4.6	Trust Supplement No. 2022-1A, dated as of March 29, 2022, between Wilmington Trust, National Association, as trustee, and Sun Country, Inc., to Pass Through Trust Agreement, dated as of December 9, 2019 (incorporated by reference to Exhibit 4.1 to Sun Country Airlines Holdings, Inc.’s Current Report on Form 8-K filed with the Securities and Exchange Commission on April 5, 2022)
4.7	Trust Supplement No. 2022-1B, dated as of March 29, 2022, between Wilmington Trust, National Association, as trustee, and Sun Country, Inc., to Pass Through Trust Agreement, dated as of December 9, 2019 (incorporated by reference to Exhibit 4.2 to Sun Country Airlines Holdings, Inc.’s Current Report on Form 8-K filed with the Securities and Exchange Commission on April 5, 2022)
4.8	Intercreditor Agreement, dated as of March 29, 2022, among Wilmington Trust, National Association, as pass through trustee under the pass through trusts, and Wilmington Trust, National Association, as subordination agent (incorporated by reference to Exhibit 4.3 to Sun Country Airlines Holdings, Inc.’s Current Report on Form 8-K filed with the Securities and Exchange Commission on April 5, 2022)
4.9	Note Purchase Agreement, dated as of March 29, 2022, among Sun Country, Inc., Wilmington Trust, National Association, as pass through trustee under the pass through trusts, and Wilmington Trust, National Association, as subordination agent (incorporated by reference to Exhibit 4.4 to Sun Country Airlines Holdings, Inc.’s Current Report on Form 8-K filed with the Securities and Exchange Commission on April 5, 2022)
4.10	Form of Participation Agreement (Participation Agreement between Sun Country, Inc. and Wilmington Trust, National Association, not in its individual capacity but solely as mortgagee, subordination agent under the Intercreditor Agreement and pass through trustee under the pass through trusts) (Exhibit B to Note Purchase Agreement) (incorporated by reference to Exhibit 4.5 to Sun Country Airlines Holdings, Inc.’s Current Report on Form 8-K filed with the Securities and Exchange Commission on April 5, 2022)

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4.11	Form of Indenture (Trust Indenture and Mortgage between Sun Country, Inc. and Wilmington Trust, National Association, not in its individual capacity, except as expressly stated therein, but solely as mortgagee) (Exhibit C to Note Purchase Agreement) (incorporated by reference to Exhibit 4.6 to Sun Country Airlines Holdings, Inc.’s Current Report on Form 8-K filed with the Securities and Exchange Commission on April 5, 2022)
4.12	Form of Sun Country, Inc. Pass Through Certificate, Series 2022-1A (incorporated by reference to Exhibit 4.7 to Sun Country Airlines Holdings, Inc.’s Current Report on Form 8-K filed with the Securities and Exchange Commission on April 5, 2022)
4.13	Form of Sun Country, Inc. Pass Through Certificate, Series 2022-1B (incorporated by reference to Exhibit 4.8 to Sun Country Airlines Holdings, Inc.’s Current Report on Form 8-K filed with the Securities and Exchange Commission on April 5, 2022)
4.14*	Description of Registrant’s Securities
4.15*#	First Amendment to Trust Indenture and Mortgage, dated as of December 30, 2024, by and between Sun Country, Inc. and Wilmington Trust, National Association, not in its individual capacity, except as expressly stated therein, but solely as mortgagee.
4.16*#	First Amendment to Participation Agreement, dated as of December 30, 2024, by and among Sun Country, Inc., Wilmington Trust, National Association, as pass through trustee under each of the Pass Through Trust Agreements, Wilmington Trust, National Association, as subordination agent, Wilmington Trust, National Association, as mortgagee, and Wilmington Trust, National Association, in its individual capacity as set forth therein.
4.17*#	Amendment to Intercreditor Agreement, dated as of December 30, 2024, by and among Sun Country, Inc., Wilmington Trust, National Association, not in its individual capacity but solely as trustee under the Sun Country Pass Through Trust 2019-1A, trustee under the Sun Country Pass Through Trust 2019-1B, and trustee under the Sun Country Pass Through Trust 2019-1C(R), and Wilmington Trust, National Association, not in its individual capacity except as expressly set forth therein but solely as subordination agent.
10.1	Loan and Guarantee Agreement, dated as of October 26, 2020, among Sun Country, Inc., as Borrower, the Guarantors party thereto from time to time, the United States Department of the Treasury, and The Bank of New York Mellon, as Administrative Agent and Collateral Agent (incorporated by reference to Exhibit 10.5 to Sun Country Airlines Holdings, Inc.’s Registration Statement on Form S-1 (File No. 333-252858))
10.2	Pledge and Security Agreement, dated as of October 26, 2020, between each of the Grantors party thereto and The Bank of New York Mellon, as Collateral Agent (incorporated by reference to Exhibit 10.6 to Sun Country Airlines Holdings, Inc.’s Registration Statement on Form S-1 (File No. 333-252858))
10.3	Payroll Support Program Agreement, dated as of April 16, 2020, by and between Sun Country, Inc. and the Department of the Treasury (incorporated by reference to Exhibit 10.7 to Sun Country Airlines Holdings, Inc.’s Registration Statement on Form S-1 (File No. 333-252858))
10.4	Payroll Support Program Extension Agreement, dated as of January 29, 2021, by and between Sun Country, Inc. and the Department of the Treasury (incorporated by reference to Exhibit 10.8 to Sun Country Airlines Holdings, Inc.’s Registration Statement on Form S-1 (File No. 333-252858))
10.5	Amended and Restated Airline Operating Agreement and Terminal Building Lease, Minneapolis-St. Paul International Airport, between Metropolitan Airports Commission and MN Airlines, LLC d/b/a Sun Country Airlines, effective January 1, 2019 (incorporated by reference to Exhibit 10.9 to Sun Country Airlines Holdings, Inc.’s Registration Statement on Form S-1 (File No. 333-252858))
10.6#	Air Transportation Services Agreement, dated as of December 13, 2019, by and between Sun Country, Inc. and Amazon.com Services, Inc. (incorporated by reference to Exhibit 10.10 to Sun Country Airlines Holdings, Inc.’s Registration Statement on Form S-1 (File No. 333-252858))

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10.7#	Amendment No. 1 to Air Transportation Services Agreement, dated as of June 30, 2020, by and between Sun Country, Inc. and Amazon.com Services, Inc. (incorporated by reference to Exhibit 10.11 to Sun Country Airlines Holdings, Inc.’s Registration Statement on Form S-1 (File No. 333-252858))
10.8#	Warrant, dated as of December 13, 2019, issued by SCA Acquisition Holdings, LLC to Amazon.com NV Investment Holdings LLC (incorporated by reference to Exhibit 10.12 to Sun Country Airlines Holdings, Inc.’s Registration Statement on Form S-1 (File No. 333-252858))
10.9	Headquarters Facility Lease Agreement, dated as of February 19, 2019, by and between the Metropolitan Airports Commission and MN Airlines, LLC dba Sun Country Airlines (incorporated by reference to Exhibit 10.13 to Sun Country Airlines Holdings, Inc.’s Registration Statement on Form S-1 (File No. 333-252858))
10.10	Amended and Restated Co-Brand Marketing Agreement, dated as of October 17, 2018, between First National Bank of Omaha and MN Airlines, LLC dba Sun Country Airlines (incorporated by reference to Exhibit 10.14 to Sun Country Airlines Holdings, Inc.’s Registration Statement on Form S-1 (File No. 333-252858))
10.11	Amendment No. 1 to Amended and Restated Co-Brand Marketing Agreement, dated as of November 1, 2018, by and between First National Bank of Omaha and MN Airlines, LLC dba Sun Country Airlines (incorporated by reference to Exhibit 10.15 to Sun Country Airlines Holdings, Inc.’s Registration Statement on Form S-1 (File No. 333-252858))
10.12	Inventory Support and Services Agreement, dated as of October 27, 2003, by and between Delta Airlines, Inc. and MN Airlines, LLC (incorporated by reference to Exhibit 10.16 to Sun Country Airlines Holdings, Inc.’s Registration Statement on Form S-1 (File No. 333-252858))
10.13	Amendment No. 1 to Inventory Support and Services Agreement, dated as of November 8, 2004, by and between Delta Airlines, Inc. and MN Airlines, LLC (incorporated by reference to Exhibit 10.17 to Sun Country Airlines Holdings, Inc.’s Registration Statement on Form S-1 (File No. 333-252858))
10.14	Amendment No. 2 to Inventory Support and Services Agreement, dated as of March 18, 2005, by and between Delta Airlines, Inc. and MN Airlines, LLC (incorporated by reference to Exhibit 10.18 to Sun Country Airlines Holdings, Inc.’s Registration Statement on Form S-1 (File No. 333-252858))
10.15	Amendment No. 3 to Inventory Support and Services Agreement, dated as of July 15, 2007, by and between Delta Airlines, Inc. and MN Airlines, LLC (incorporated by reference to Exhibit 10.19 to Sun Country Airlines Holdings, Inc.’s Registration Statement on Form S-1 (File No. 333-252858))
10.16	Amendment No. 4 to Inventory Support and Services Agreement, dated as of May 23, 2008, by and between Delta Airlines, Inc. and MN Airlines, LLC (incorporated by reference to Exhibit 10.20 to Sun Country Airlines Holdings, Inc.’s Registration Statement on Form S-1 (File No. 333-252858))
10.17	Amendment No. 5 to Inventory Support and Services Agreement, dated as of June 4, 2008, by and between Delta Airlines, Inc. and MN Airlines, LLC (incorporated by reference to Exhibit 10.21 to Sun Country Airlines Holdings, Inc.’s Registration Statement on Form S-1 (File No. 333-252858))
10.18	Amendment No. 6 to Inventory Support and Services Agreement, dated as of April 1, 2009, by and between Delta Airlines, Inc. and MN Airlines, LLC (incorporated by reference to Exhibit 10.22 to Sun Country Airlines Holdings, Inc.’s Registration Statement on Form S-1 (File No. 333-252858))
10.19	Amendment No. 7 to Inventory Support and Services Agreement, dated as of April 7, 2009, by and between Delta Airlines, Inc. and MN Airlines, LLC (incorporated by reference to Exhibit 10.23 to Sun Country Airlines Holdings, Inc.’s Registration Statement on Form S-1 (File No. 333-252858))

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10.20	Amendment No. 8 to Inventory Support and Services Agreement, dated as of May 1, 2009, by and between Delta Airlines, Inc. and MN Airlines, LLC (incorporated by reference to Exhibit 10.24 to Sun Country Airlines Holdings, Inc.’s Registration Statement on Form S-1 (File No. 333-252858))
10.21	Amendment No. 9 to Inventory Support and Services Agreement, dated as of August 1, 2009, by and between Delta Airlines, Inc. and MN Airlines, LLC (incorporated by reference to Exhibit 10.25 to Sun Country Airlines Holdings, Inc.’s Registration Statement on Form S-1 (File No. 333-252858))
10.22	Amendment No. 10 to Inventory Support and Services Agreement, dated as of January 1, 2010, by and between Delta Airlines, Inc. and MN Airlines, LLC (incorporated by reference to Exhibit 10.26 to Sun Country Airlines Holdings, Inc.’s Registration Statement on Form S-1 (File No. 333-252858))
10.23	Amendment No. 11 to Inventory Support and Services Agreement, dated as of May 1, 2010, by and between Delta Airlines, Inc. and MN Airlines, LLC (incorporated by reference to Exhibit 10.27 to Sun Country Airlines Holdings, Inc.’s Registration Statement on Form S-1 (File No. 333-252858))
10.24	Amendment No. 13 to Inventory Support and Services Agreement, dated as of November 1, 2011, by and between Delta Airlines, Inc. and MN Airlines, LLC (incorporated by reference to Exhibit 10.28 to Sun Country Airlines Holdings, Inc.’s Registration Statement on Form S-1 (File No. 333-252858))
10.25	Amendment No. 14 to Inventory Support and Services Agreement, dated as of May 28, 2013, by and between Delta Airlines, Inc. and MN Airlines, LLC (incorporated by reference to Exhibit 10.29 to Sun Country Airlines Holdings, Inc.’s Registration Statement on Form S-1 (File No. 333-252858))
10.26	Amendment No. 15 to Inventory Support and Services Agreement, dated as of July 23, 2014, by and between Delta Airlines, Inc. and MN Airlines, LLC (incorporated by reference to Exhibit 10.30 to Sun Country Airlines Holdings, Inc.’s Registration Statement on Form S-1 (File No. 333-252858))
10.27	Amendment No. 16 to Inventory Support and Services Agreement, dated as of March 20, 2015, by and between Delta Airlines, Inc. and MN Airlines, LLC (incorporated by reference to Exhibit 10.31 to Sun Country Airlines Holdings, Inc.’s Registration Statement on Form S-1 (File No. 333-252858))
10.28	Amendment No. 17 to Inventory Support and Services Agreement, dated as of April 1, 2018, by and between Delta Airlines, Inc. and MN Airlines, LLC (incorporated by reference to Exhibit 10.32 to Sun Country Airlines Holdings, Inc.’s Registration Statement on Form S-1 (File No. 333-252858))
10.29	Amendment No. 18 to Inventory Support and Services Agreement, dated as of May 15, 2019, by and between Delta Airlines, Inc. and MN Airlines, LLC (incorporated by reference to Exhibit 10.33 to Sun Country Airlines Holdings, Inc.’s Registration Statement on Form S-1 (File No. 333-252858))
10.30	2002 Master Agreement, dated as of May 1, 2019 between J. Aron & Company LLC and MN Airlines, LLC (incorporated by reference to Exhibit 10.34 to Sun Country Airlines Holdings, Inc.’s Registration Statement on Form S-1 (File No. 333-252858))
10.31	2002 Master Agreement, dated as of April 12, 2018 between Morgan Stanley Capital Services LLC and MN Airlines, LLC (incorporated by reference to Exhibit 10.35 to Sun Country Airlines Holdings, Inc.’s Registration Statement on Form S-1 (File No. 333-252858))
10.32	Trust Agreement of SCA-1 Intermediate Aircraft Holding Trust, dated as of September 25, 2018, by and among SCA-1 Intermediate Charitable Trust and Wilmington Trust Company (incorporated by reference to Exhibit 10.36 to Sun Country Airlines Holdings, Inc.’s Registration Statement on Form S-1 (File No. 333-252858))

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10.33	Third Amended and Restated Stockholders’ Agreement by and among Sun Country Airlines Holdings, Inc. and the stockholders party thereto (incorporated by reference to Exhibit 10.2 to Sun Country Airlines Holdings, Inc.’s Current Report on Form 8-K filed with the Securities and Exchange Commission on March 22, 2021)
10.34	Registration Rights Agreement by and between Sun Country Airlines Holdings, Inc. and the Holders party thereto (incorporated by reference to Exhibit 10.1 to Sun Country Airlines Holdings, Inc.’s Current Report on Form 8-K filed with the Securities and Exchange Commission on March 22, 2021)
10.35†	Form of Indemnification Agreement by and between the Registrant and each of its directors and executive officers (incorporated by reference to Exhibit 10.39 to Sun Country Airlines Holdings, Inc.’s Registration Statement on Form S-1 (File No. 333-252858))
10.36†	SCA Acquisition Holdings, LLC Amended and Restated Equity Incentive Plan, dated as of July 1, 2019 (incorporated by reference to Exhibit 10.40 to Sun Country Airlines Holdings, Inc.’s Registration Statement on Form S-1 (File No. 333-252858))
10.37†	Sun Country Airlines Holdings, Inc. 2021 Omnibus Incentive Plan (incorporated by reference to Exhibit 4.2 to Sun Country Airlines Holdings, Inc.’s Registration Statement on Form S-8 (File No. 333-254371))
10.38†	Form of Option Award Agreement (incorporated by reference to Exhibit 10.42 to Sun Country Airlines Holdings, Inc.’s Registration Statement on Form S-1 (File No. 333-252858))
10.39†	Employment Agreement, dated as of July 1, 2019, by and between Gregory A. Mays and Sun Country, Inc. (incorporated by reference to Exhibit 10.45 to Sun Country Airlines Holdings, Inc.’s Registration Statement on Form S-1 (File No. 333-252858))
10.40	Income Tax Receivable Agreement, by and among Sun Country Airlines, Inc., Sun Country Airlines Holdings, Inc. and the other parties thereto (incorporated by reference to Exhibit 10.3 to Sun Country Airlines Holdings, Inc.’s Current Report on Form 8-K filed with the Securities and Exchange Commission on March 22, 2021)
10.41	Credit Agreement, dated as of February 10, 2021, among SCA Acquisition, LLC, Sun Country, Inc., the lenders and issuing banks party thereto and Barclays Bank PLC, as administrative agent (incorporated by reference to Exhibit 10.47 to Sun Country Airlines Holdings, Inc.’s Registration Statement on Form S-1 (File No. 333-252858))
10.42	Payroll Support Program 3 Agreement, dated as of April 27, 2021, by and between Sun Country, Inc. and the Department of the Treasury (incorporated by reference to Exhibit 10.1 to Sun Country Airlines Holdings, Inc.’s Quarterly Report on Form 10-Q filed with the Securities and Exchange Commission on July 28, 2021)
10.43†	Form of Restricted Stock Unit Award Agreement under the Sun Country Airlines Holdings, Inc. 2021 Omnibus Incentive Plan (incorporated by reference to exhibit 10.43 to Sun Country Airlines Holdings, Inc.'s Annual Report on Form 10-K filed with the Securities and Exchange Commission on February 14, 2024)
10.44†	Employment Letter, dated as of July 1, 2023, by and between Sun Country, Inc. and Rose Nealehttps://www.sec.gov/Archives/edgar/data/1743907/000174390724000005/ex1044suncountry-roseneale.htm(incorporated by reference to exhibit 10.44 to Sun Country Airlines Holdings, Inc.'sAnnual Report onForm10-K filed with the Securities and Exchange Commission on February 14, 2024)
10.45	Term Loan Facility Agreement, dated as of March 21, 2023, by and among Sun Country Airlines Holdings, Inc., Sun Country, Inc. (D/B/A Sun Country Airlines), the lenders party thereto and UMB Bank, National Association, as facility agent, security trustee and account bank (incorporated by reference to Exhibit 10.2 to Sun Country Airlines Holdings, Inc.’s Quarterly Report on Form 10-Q filed with the Securities and Exchange Commission on April 28, 2023)
10.46†	Employment Agreement, dated as of April 11, 2023, by and between Jude Bricker and Sun Country, Inc. (incorporated by reference to Exhibit 10.1 to Sun Country Airlines Holdings, Inc.'s Current Report on Form 8-K filed with the Securities and Exchange Commission on May 12, 2023)

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10.47†	Employment Agreement, dated as of April 11, 2023, by and between David Davis and Sun Country, Inc. (incorporated by reference to Exhibit 10.2 to Sun Country Airlines Holdings, Inc.'s Current Report on Form 8-K filed with the Securities and Exchange Commission on May 12, 2023)
10.48#	Amendment 19 to the Inventory Support Services Agreement, dated as July 20, 2023, by and between Sun Country, Inc., dba Sun Country Airlines and Delta Air Lines, Inc. (incorporated by reference to Exhibit 10.1 to Sun Country Airlines Holdings, Inc.’s Quarterly Report on Form 10-Q filed with the Securities and Exchange Commission on November 7, 2023)
10.49†	Employment Letter, dated as of July 1, 2023, by and between Sun Country, Inc. and Eric Levenhagen (incorporated by reference to exhibit 10.49 to Sun Country Airlines Holdings, Inc.'s Annual Report on Form 10-K filed with the Securities and Exchange Commission on February 14, 2024)
10.50†	Employment Letter, dated as of July 1, 2023, by and between Sun Country, Inc. and Grant Whitney (incorporated by reference to exhibit 10.50 to Sun Country Airlines Holdings, Inc.'s Annual Report on Form 10-K filed with the Securities and Exchange Commission on February 14, 2024)
10.51	Form of Performance-Based Restricted Stock Unit Award Agreement under the Sun Country Airlines Holdings, Inc. 2021 Omnibus Incentive Plan (incorporated by reference to Exhibit 10.1 to Sun Country Airlines Holdings, Inc.’s Quarterly Report on Form 10-Q filed with the Securities and Exchange Commission on May 7, 2024)
10.52	Amended and Restated Air Transportation Services Agreement, dated as of June 18, 2024, by and between Sun Country, Inc. and Amazon.com Services LLC (incorporated by reference to Exhibit 10.1 to Sun Country Airlines Holdings, Inc.'s Form 8-K filed with the Securities and Exchange Commission on June 20, 2024)
19.1*	Sun Country Airlines Insider Trading Policy
21.1	Subsidiaries of the registrant (incorporated by reference to Exhibit 21.1 to Sun Country Airlines Holdings, Inc.’s Registration Statement on Form S-1 (File No. 333-252858))
23.1*	Consent of KPMG LLP, independent registered public accounting firm
31.1*	Certification by Sun Country’s Chief Executive Officer with respect to Sun Country’s Annual Report on Form 10-K for the fiscal year ended December 31, 2024
31.2*	Certification by Sun Country’s President and Chief Financial Officer with respect to Sun Country’s Annual Report on Form 10-K for the fiscal year ended December 31, 2024
32*	Certification pursuant to Section 1350 of Chapter 63 of Title 18 of the United States Code by Sun Country Airlines Holdings, Inc.’s Chief Executive Officer and President and Chief Financial Officer with respect to Sun Country’s Annual Report on Form 10-K for the fiscal year ended December 31, 2024
97	Sun Country Airlines Clawback Policy (incorporated by reference to exhibit 97 to Sun Country Airlines Holdings, Inc.'s Annual Report on Form 10-K filed with the Securities and Exchange Commission on February 14, 2024)
101.INS*	Inline XBRL Instance Document - The instance document does not appear in the interactive data file because its XBRL tags are embedded within the Inline XBRL document
101.SCH*	Inline XBRL Taxonomy Extension Schema Document
101.CAL*	Inline XBRL Taxonomy Extension Calculation Linkbase Document
101.DEF*	Inline XBRL Taxonomy Extension Definition Linkbase Document
101.LAB*	Inline XBRL Taxonomy Extension Labels Linkbase Document
101.PRE*	Inline XBRL Taxonomy Extension Presentation Linkbase Document
104*	Cover Page Interactive Data Files (formatted as inline XBRL and contained in Exhibit 101)

__________________________________

*Filed herewith

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†Indicates management contract or compensatory plan.

#    Portions of this exhibit have been omitted pursuant to Item 601(b)(10)(iv) of Regulation S-K.

ITEM 16: FORM 10-K SUMMARY

None.

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SIGNATURE

Pursuant to the requirements of the Securities Exchange Act of 1934, the registrant has duly caused this report to be signed on its behalf by the undersigned thereunto duly authorized.

	Sun Country Airlines Holdings, Inc.
	(Registrant)
	/s/ Dave Davis
	Dave Davis
	President and Chief Financial Officer
	(Principal Financial and Accounting Officer)
February 12, 2025

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SIGNATURES

Pursuant to the requirements of the Securities Exchange Act of 1934, this report has been signed by the following persons on behalf of the registrant in the capacities and on the dates indicated.

Signature	Title	Date
/s/ Jude Bricker	Chief Executive Officer; Director	February 12, 2025
Jude Bricker	(Principal Executive Officer)
/s/ Dave Davis	President and Chief Financial Officer;	February 12, 2025
Dave Davis	Director (Principal Financial and Accounting Officer)
/s/ Jennifer Vogel	Chair of the Board; Director	February 12, 2025
Jennifer Vogel
/s/ Patrick O'Keeffe	Director	February 12, 2025
Patrick O'Keeffe
/s/ Thomas C. Kennedy	Director	February 12, 2025
Thomas C. Kennedy
/s/ Marion Blakey	Director	February 12, 2025
Marion Blakey
/s/ Kerry Philipovitch	Director	February 12, 2025
Kerry Philipovitch
/s/ Gail Peterson	Director	February 12, 2025
Gail Peterson

124

Document

Exhibit 4.14

Description of Registrant’s Securities

As of December 31, 2024, Sun Country Airlines Holdings, Inc. (“Sun Country”, the “Company,” “we,” “us” and “our”) had one class of securities registered under Section 12 of the Securities Exchange Act of 1934, as amended (the “Exchange Act”): common stock, par value $0.01 per share. The following description of Sun Country’s capital stock summarizes certain material terms of our amended and restated certificate of incorporation (the “certificate of incorporation”) and amended and restated bylaws (the “bylaws”) and of specific provisions of Delaware law. The following description is intended as a summary only and is qualified in its entirety by reference to our certificate of incorporation and our bylaws, copies of which have been filed as exhibits to this Annual Report on Form 10-K, and the Delaware General Corporation Law, or the DGCL. Defined terms used herein, but otherwise not defined shall have the meaning ascribed to them in this Annual Report on Form 10-K.

General

Our capital stock consists of 1,000,000,000 authorized shares, of which 995,000,000 shares, par value $0.01 per share, are designated as “common stock” and 5,000,000 shares, par value $0.01 per share, are designated as “preferred stock.” As of December 31, 2024, there were 53,157,964 shares of common stock outstanding and no shares of preferred stock outstanding.

Common Stock

Voting Rights. The holders of our common stock are entitled to one vote per share on all matters submitted for action by the stockholders generally.

Dividend Rights. Subject to any preferential rights of any then outstanding preferred stock, all shares of our common stock are entitled to share equally in any dividends our board of directors may declare from legally available sources.

Liquidation Rights. Upon our liquidation, dissolution or winding up, whether voluntary or involuntary, after payment in full of the amounts required to be paid to holders of any the outstanding preferred stock, all shares of our common stock are entitled to share equally in the assets available for distribution to stockholders after payment of all of our prior obligations.

Other Matters. Holders of our common stock have no preemptive or conversion rights, and our common stock is not subject to further calls or assessments by us. There are no redemption or sinking fund provisions applicable to our common stock. The rights, powers, preferences and privileges of holders of our common stock will be subject to those of the holders of any shares of our preferred stock that we may designate and issue in the future.

Preferred Stock

Pursuant to our certificate of incorporation, shares of preferred stock are issuable from time to time, in one or more series, with the designations, voting rights (full, limited or no voting rights), powers, preferences, participating, optional or other special rights (if any), and any qualifications, limitations or restrictions thereof, of each series as our board of directors from time to time may adopt by resolution (and without further stockholder approval). Each series of preferred stock will consist of an authorized number of shares as will be stated and expressed in the certificate of designations providing for the creation of the series.

Warrants

In connection with the original ATSA, we issued warrants (the “2019 Warrants”) to purchase an aggregate of 9,482,606 shares of SCA common stock at an exercise price of approximately $15.17 per share to Amazon. In connection with the Reorganization Transactions, the 2019 Warrants were converted into warrants to purchase an aggregate of 9,482,606 shares of our common stock and the exercise price remained unchanged. 1.0% of the 2019 Warrants vested upon issuance of the warrants and incremental tranches vest upon certain milestones of aggregate global payments by Amazon to the Company or its affiliates pursuant to the ATSA up to a total of $1.12 billion of aggregate payments. As of December 31, 2024, approximately 43% of the 2019 Warrants were vested. Any unvested 2019 Warrants will become vested upon a change of control (as defined in the 2019 Warrant) or certain transfers of 30% or more of the voting power in the Company to a new person or group (other than any equity offering by the Company or the Apollo Stockholder pursuant to an effective registration statement so long as no person or group (within the meaning of the Exchange Act) acquires more than 50% of the voting power of the Company in such offering). Vested 2019 Warrants may be exercised until the eighth anniversary of the issue date.

In the event we or our equityholders propose to initiate a process to explore, enter into negotiations or accept any offer with respect to a change of control of the Company, we are required to provide Amazon at least 30 days’ written notice prior to entering into any definitive agreement or binding letter of intent. In addition, Amazon will have the right to enter into non-exclusive, good faith negotiations with us and our equityholders with respect to such proposed change of control and we will not be permitted to enter into any definitive or binding agreement before the expiration of the 30-day period, which period may be extended under certain circumstances.

Composition of Board of Directors; Election and Removal

In accordance with our certificate of incorporation and our bylaws, the number of directors comprising our board of directors is determined from time to time exclusively by our board of directors; provided that the number of directors shall not be less than three and shall not exceed 15. Our certificate of incorporation provides for a board of directors divided into three classes (each as nearly as equal as possible and with directors in each class serving staggered three-year terms), currently consisting of three directors in Class I, two directors in Class II and three directors in Class III. See “—Certain Corporate Anti-takeover Provisions—Classified Board of Directors.”

Under our Stockholders Agreement, the Apollo Stockholder has the right, but not the obligation, at any time until Apollo and its affiliates, including the Apollo Stockholder, no longer beneficially own at least 5% of our issued and outstanding common stock, to nominate a number of directors comprising a percentage of our board of directors in accordance with their beneficial ownership of our outstanding common stock (rounded up to the nearest whole number), except that if Apollo and its affiliates, including the Apollo Stockholder, beneficially own more than 50% of the voting power of our outstanding common stock, the Apollo Stockholder will have the right to nominate a majority of the directors. We refer to the directors nominated by the Apollo Stockholder based on such percentage ownership as the “Apollo Directors.”

For so long as Amazon holds the 2019 Warrants or any shares of common stock issued upon exercise of the 2019 Warrants and the ATSA remains in effect, Amazon will have the right to nominate a member or an observer to our board of directors. We refer to the director nominated by Amazon, if any, as the “Amazon Director.” As of the date of this prospectus, Amazon has not exercised its right to nominate a member or an observer to our board of directors.

Each director is to hold office for a three year term and until the annual meeting of stockholders for the election of the class of directors to which such director has been elected and until his or her successor is duly elected and qualified or until his or her earlier death, resignation or removal. Any vacancy on our board of directors (other than in respect of an Apollo Director or an Amazon Director) will be filled only by the affirmative vote of a majority of the remaining directors, even if less than a quorum. Any vacancy on our board of directors in respect of an Apollo Director will be filled only by individuals designated by the Apollo Stockholder, for so long as Apollo and its affiliates, including the Apollo Stockholder, beneficially own at least 5% of our issued and outstanding common stock, and any vacancy in respect of an Amazon Director shall only be filled by Amazon.

At any meeting of our board of directors, except as otherwise required by law, a majority of the total number of directors then in office will constitute a quorum for all purposes, except that if Apollo and its affiliates, including the Apollo Stockholder, beneficially own at least 5% of our issued and outstanding common stock and there is at least one member of our board of directors who is an Apollo Director, then at least one director that is an Apollo Director must be present for there to be a quorum unless each Apollo Director waives his or her right to be included in the quorum at such meeting.

Certain Corporate Anti-takeover Provisions

Certain provisions in our certificate of incorporation, bylaws and Stockholders Agreement summarized below may be deemed to have an anti-takeover effect and may delay, deter or prevent a tender offer or takeover attempt that a stockholder might consider to be in its best interests, including attempts that might result in a premium being paid over the market price for the shares held by stockholders.

Preferred Stock

Our certificate of incorporation contains provisions that permit our board of directors to issue, without any further vote or action by stockholders, shares of preferred stock in one or more series and, with respect to each such series, to fix the number of shares constituting the series and the designation of the series, the voting rights (if any) of the shares of the series, the powers, preference, participating, optional or other special rights, if any, and any qualifications, limitations or restrictions, of the shares of such series.

Classified Board of Directors

Our certificate of incorporation provides that our board of directors will be divided into three classes of directors, with the classes to be as nearly equal in number as possible, and with the directors in each class serving staggered three-year terms. As a result, approximately one-third of our board of directors will be elected each year. The classification of directors will have the effect of making it more difficult for stockholders to change the composition of our board of directors. Our certificate of incorporation provides that, subject to any rights of holders of preferred stock to elect additional directors under specified circumstances, the number of directors will be fixed from time to time exclusively pursuant to a resolution adopted by our board of directors, as described above in “—Composition of Board of Directors; Election and Removal.”

Removal of Directors; Vacancies

Under the DGCL, unless otherwise provided in our certificate of incorporation, directors serving on a classified board may be removed by the stockholders only for cause. Our certificate of incorporation provides that directors may be removed with or without cause upon the affirmative vote of a majority in voting power of all outstanding shares of stock entitled to vote thereon, voting together as a single class; provided, however, that (i) from and after the time Apollo and its affiliates, including the Apollo Stockholder, cease to beneficially own, in the aggregate, at least 50.1% of the voting power of our outstanding common stock, directors may only be removed for cause, and only by the affirmative vote of holders of at least 66 2/3% in voting power of all the then-outstanding shares of stock of the Company entitled to vote thereon, voting together as a single class and (ii) Amazon must consent to the removal of any Amazon Director. Any vacancy on our board of directors in respect of an Apollo Director shall only be filled by the Apollo Stockholder and any vacancy on our board of directors in respect of an Amazon Director shall only be filled by Amazon. Any other vacancy on our board of directors will be filled only by the affirmative vote of a majority of the remaining directors, even if less than a quorum, as described above in “— Composition of Board of Directors; Election and Removal.”

No Cumulative Voting

Under our certificate of incorporation, stockholders do not have the right to cumulative votes in the election of directors.

Special Meetings of Stockholders

Our certificate of incorporation provides that if less than 50.1% of the voting power of our outstanding common stock is beneficially owned by Apollo and its affiliates, including the Apollo Stockholder, special meetings of the stockholders may be called only by the chairman of the board of directors or by the secretary at the direction of a majority of the directors then in office. For so long as at least 50.1% of the voting power of our outstanding common stock is beneficially owned by Apollo and its affiliates, including the Apollo Stockholder, special meetings may also be called by the secretary at the written request of the holders of a majority of the voting power of the then outstanding common stock. The business transacted at any special meeting will be limited to the proposal or proposals included in the notice of the meeting.

Stockholder Action by Written Consent

Subject to the rights of the holders of one or more series of our preferred stock then outstanding, any action required or permitted to be taken by stockholders must be effected at a duly called annual or special meeting of our stockholders; provided, that prior to the time at which Apollo and its affiliates, including the Apollo Stockholder, cease to beneficially own at least 50.1% of the voting power our outstanding common stock, any action required or permitted to be taken at any annual or special meeting of our stockholders may be taken without a meeting, without prior notice and without a vote, if a consent or consents in writing, setting forth the action so taken, is signed by or on behalf of the holders of outstanding stock having not less than the minimum number of votes that would be necessary to authorize or take such action at a meeting at which all shares entitled to vote thereon were present and voted and are delivered in accordance with applicable Delaware law.

Advance Notice Requirements for Stockholder Proposals and Director Nominations

Our bylaws provide that stockholders who are seeking to bring business before an annual meeting of stockholders and stockholders who are seeking to nominate candidates for election as directors at an annual meeting of stockholders, other than any nomination for an Amazon Director or an Apollo Director, must provide timely notice thereof in writing. To be timely, a stockholder’s notice generally must be delivered to and received at our principal executive offices not less than 90 days nor more than 120 days prior to the first anniversary of the preceding year’s annual meeting of stockholders; provided, that in the event that the date of such meeting is advanced by more than 30 days prior to, or delayed by more than 60 days after, the anniversary of the preceding year’s annual meeting of our stockholders, a stockholder’s notice to be timely must be so delivered not earlier than the close of business on the 120th day prior to such meeting and not later than the close of business on the 90th day prior to such meeting or, if the first public announcement of the date of such meeting is less than 100 days prior to the date of such annual meeting, the 10th day following the day on which public announcement of the date of such meeting is first made. Our bylaws specify certain requirements as to the form and content of a stockholder’s notice.

These provisions may preclude stockholders from bringing matters before an annual meeting of stockholders or from making nominations for directors at an annual meeting of stockholders.

All of the foregoing provisions of our certificate of incorporation and bylaws could discourage potential acquisition proposals and could delay or prevent a change in control. These provisions are intended to enhance the likelihood of continuity and stability in the composition of the board of directors and in the policies formulated by the board of directors and to discourage certain types of transactions that may involve an actual or threatened change in control. These same provisions may delay, deter or prevent a tender offer or takeover attempt that a stockholder might consider to be in its best interest. In addition, such provisions could have the effect of discouraging others from making tender offers for our shares and, as a consequence, they also may inhibit fluctuations in the market price of our common stock that could result from actual or rumored takeover attempts. Such provisions also may have the effect of preventing changes in our management.

Delaware Takeover Statute

Our certificate of incorporation provides that we are not governed by Section 203 of the DGCL which, in the absence of such provisions, would have imposed additional requirements regarding mergers and other business combinations.

However, our certificate of incorporation includes a provision that restricts us from engaging in any business combination with an interested stockholder for three years following the date that person becomes an interested stockholder. Such restrictions shall not apply to any business combination between Apollo and any affiliate thereof, including the Apollo Funds and the Apollo Stockholder, or their direct and indirect transferees, on the one hand, and us, on the other. In addition, such restrictions will not apply if:

•a stockholder becomes an interested stockholder inadvertently and (i) as soon as practicable divests itself of ownership of sufficient shares so that it ceases to be an interested stockholder and (ii) within the three-year period immediately prior to the business combination between the Company and such stockholder, would not have been an interested stockholder but for the inadvertent acquisition of ownership; or

•the business combination is proposed prior to the consummation or abandonment of, and subsequent to the earlier of the public announcement or the notice required under the certificate of incorporation of, a proposed transaction that (i) constitutes one of the transactions described in the proviso of this sentence, (ii) is with or by a person who either was not an interested stockholder during the previous three years or who became an interested stockholder with the approval of our board of directors and (iii) is approved or not opposed by a majority of the directors then in office (but not less than one) who were directors prior to any person becoming an interested stockholder during the previous three years or were recommended for election or elected to succeed such directors by a majority of such directors; provided that the proposed transactions are limited to (x) a merger or consolidation of the Company (except for a merger in respect of which, pursuant to Section 251(f) of the DGCL, no vote of the stockholders of the Company is required), (y) a sale, lease, exchange, mortgage, whether as part of a dissolution or otherwise, of assets of the Company or of any direct or indirect majority-owned subsidiary of the Company (other than to any wholly owned subsidiary or to the Company) having an aggregate market value equal to 50% or more of either that aggregate market value of all the assets of the Company determined on a consolidated basis or the aggregate market value of all the outstanding stock of the Company or (z) a proposed tender or exchange offer for 50% or more of the outstanding voting stock of the Company; provided further that the Company will give not less than 20 days’ notice to all interested stockholders prior to the consummation of any of the transactions described in clause (x) or (y) above. Additionally, we would be able to enter into a business combination with an interested stockholder if:

•before that person became an interested stockholder, our board of directors approved the transaction in which the interested stockholder became an interested stockholder or approved the business combination;

•upon consummation of the transaction that resulted in the interested stockholder becoming an interested stockholder, the interested stockholder owned at least 85% of our voting stock outstanding at the time the transaction commenced, excluding for purposes of determining the voting stock outstanding (but not the outstanding voting stock owned by the interested stockholder) stock held by directors who are also officers of our Company and by employee stock plans that do not provide employees with the right to determine confidentially whether shares held under the plan will be tendered in a tender or exchange offer; or

•following the transaction in which that person became an interested stockholder, the business combination is approved by our board of directors and authorized at a meeting of stockholders by the affirmative vote of the holders of at least 66 2/3% of the voting power of our outstanding voting stock not owned by the interested stockholder.

In general, a “business combination” is defined to include mergers, asset sales and other transactions resulting in financial benefit to a stockholder and an “interested stockholder” is any person who, together with affiliates and associates, is the owner of 15% or more of our outstanding voting stock or is our affiliate or associate and was the owner of 15% or more of our outstanding voting stock at any time within the three-year period immediately before the date of determination. Under our certificate of incorporation, an “interested stockholder” generally does not include Apollo and any affiliate thereof or their direct and indirect transferees.

This provision of our certificate of incorporation could prohibit or delay mergers or other takeover or change in control attempts and, accordingly, may discourage attempts to acquire us even though such a transaction may offer our stockholders the opportunity to sell their stock at a price above the prevailing market price.

Amendment of Our Certificate of Incorporation

Under Delaware law, our certificate of incorporation may be amended only with the affirmative vote of holders of at least a majority of the outstanding stock entitled to vote thereon.

Notwithstanding the foregoing, our certificate of incorporation provides that, from and after the time Apollo and its affiliates, including the Apollo Stockholder, cease to beneficially own at least 50.1% of the voting power of our outstanding common stock, in addition to any vote required by applicable law, our certificate of incorporation or bylaws, the affirmative vote of holders of at least 66 2/3% of the voting power of our outstanding shares of our capital stock entitled to vote thereon, voting together as a single class, is required to alter, amend or repeal the following provisions of our certificate of incorporation:

•the provision authorizing the board of directors to designate one or more series of preferred stock and, by resolution, to provide the rights, powers and preferences, and the qualifications, limitations and restrictions thereof, of any series of preferred stock;

•the provisions providing for a classified board of directors and the number of the directors, establishing the term of office of directors, setting forth the quorum of any meeting of the board of directors, relating to the removal of directors, specifying the manner in which vacancies on the board of directors and newly created directorships may be filled and relating to any voting rights of preferred stock;

•the provisions authorizing our board of directors to make, alter, amend or repeal our bylaws;

•the provisions regarding the calling of special meetings and stockholder action by written consent in lieu of a meeting;

•the provisions eliminating monetary damages for breaches of fiduciary duty by a director;

•the provisions providing for indemnification and advance of expenses of our directors and officers;

•the provisions regarding competition and corporate opportunities;

•the provision specifying that, unless we consent in writing to the selection of an alternative forum, the Chancery Court of the State of Delaware will be the sole and exclusive forum for intra-corporate disputes and the federal district courts of the United States will be the exclusive forum for causes of actions arising under the Securities Act;

•the provisions regarding entering into business combinations with interested stockholders;

•the provision requiring that, from and after the time Apollo and its affiliates, including the Apollo Stockholder, cease to beneficially own at least 50.1% of the voting power of our outstanding common stock, amendments to specified provisions of our certificate of incorporation require the affirmative vote of 66 2/3% in voting power of our outstanding stock, voting as a single class; and

•the provision requiring that, from and after the time Apollo and its affiliates, including the Apollo Stockholder, cease to beneficially own at least 50.1% of the voting power of our outstanding common stock, amendments by the stockholders to our bylaws require the affirmative vote of 66 2/3% in voting power of our outstanding stock, voting as a single class.

Amendment of Our Bylaws

Our bylaws provide that they can be amended by the vote of the holders of shares constituting a majority of the voting power or by the vote of a majority of the board of directors. However, our certificate of incorporation provides that, from and after the time Apollo and its affiliates, including the Apollo Stockholder, cease to beneficially own at least 50.1% of the voting power of our outstanding common stock, in addition to any vote required under our certificate of incorporation, the affirmative vote of the holders of at least 66 2/3% of the voting power of the outstanding shares of stock entitled to vote thereon, voting as a single class, is required for the stockholders to alter, amend or repeal any provision of our bylaws or to adopt any provision inconsistent therewith.

Certain Matters that Require Consent of our Stockholders

The Stockholders Agreement provides that until Apollo and its affiliates, including the Apollo Stockholder, no longer beneficially own at least 25% of our issued and outstanding common stock, we will not take certain significant actions specified therein without the prior consent of the Apollo Stockholder, including, but not limited to:

•any material acquisition of equity interests or assets of any other entity, or any business, properties, assets or entities, other than acquisitions of aircraft or engines in the ordinary course of business and other ordinary course acquisitions with vendors, customers and suppliers;

•any material disposition of any of our or our subsidiaries’ assets or equity interests, other than dispositions of aircraft or engines in the ordinary course of business; or

•merging or consolidating with or into any other entity, or transferring (by lease, assignment, sale or otherwise) all or substantially all of the Company’s and our subsidiaries’ assets, taken as a whole, to another entity, or enter into or agree to undertake any other transaction that would constitute a “change of control” as defined in the Stockholders Agreement (other than, in each case, transactions among the Company and our wholly-owned subsidiaries).

The provisions of the DGCL, our certificate of incorporation, our bylaws and our Stockholders Agreement could have the effect of discouraging others from attempting hostile takeovers and, as a consequence, they may also inhibit temporary fluctuations in the market price of our common stock that often result from actual or rumored hostile takeover attempts. These provisions may also have the effect of preventing changes in our management. It is possible that these provisions could make it more difficult to accomplish transactions that stockholders may otherwise deem to be in their best interests.

Limited Ownership and Voting by Foreign Owners

To comply with restrictions imposed by federal law on foreign ownership and control of U.S. airlines, our certificate of incorporation and bylaws restrict ownership and control of shares of our common stock by non-U.S. citizens. The restrictions imposed by federal law and DOT policy require that we be owned and controlled by U.S. citizens, that no more than 25% of our voting stock be owned or controlled, directly or indirectly, by persons or entities who are not U.S. citizens, as defined in 49 U.S.C. § 40102(a)(15), that no more than 49% of our stock be owned or controlled, directly or indirectly, by persons or entities who are not U.S. citizens and are from countries that have entered into “open skies” air transport agreements with the United States, that our president and at least two-thirds of the members of our board of directors and other managing officers be U.S. citizens and that we be under the actual control of U.S. citizens. Our certificate of incorporation and bylaws provide that the failure of non-U.S. citizens to register their shares on a separate stock record, which we refer to as the “foreign stock record,” would result in a loss of their voting rights in the event and to the extent that the aggregate foreign ownership of the outstanding common stock exceeds the foreign ownership restrictions imposed by federal law. Our bylaws further provide that no shares of our common stock will be registered on the foreign stock record if the amount so registered would exceed the foreign ownership restrictions imposed by federal law. If it is determined that the amount registered in the foreign stock record exceeds the foreign ownership restrictions imposed by federal law, shares will be removed from the foreign stock record, resulting in the loss of voting rights, in reverse chronological order based on the date of registration therein, until the number of shares registered therein does not exceed the foreign ownership restrictions imposed by federal law. We are currently in compliance with these ownership restrictions.

Exclusive Forum Selection

Unless we consent in writing to the selection of an alternative forum, the Chancery Court of the State of Delaware will, to the fullest extent permitted by law, be the sole and exclusive forum for:

•any derivative action or proceeding brought on our behalf;

•any action asserting a claim of breach of a fiduciary duty owed by any of our directors, officers, employees or agents to us or our stockholders;

•any action asserting a claim arising pursuant to any provision of the DGCL or of our certificate of incorporation or our bylaws; or

•any action asserting a claim against us or any of our directors or officers governed by the internal affairs doctrine, in each such case subject to the Delaware Court of Chancery having personal jurisdiction over the indispensable parties named as defendants.

Notwithstanding the foregoing, the provisions of the foregoing paragraph will not apply to suits brought to enforce any liability or duty created by the Securities Act, the Exchange Act or any other claim for which the federal district courts of the United States have exclusive jurisdiction. For instance, the provision would not apply to actions arising under federal securities laws, including suits brought to enforce any liability or duty created by the Securities Act, Exchange Act or the rules and regulations thereunder. Our certificate of incorporation further provides that the federal district courts of the United States shall, to the fullest extent permitted by law, be the sole and exclusive forum for the resolution of any action, suit or proceeding asserting a cause of action arising under the Securities Act. Any person or entity purchasing or otherwise acquiring any interest in any shares of our capital stock will be deemed to have notice of and, to the fullest extent permitted by law, to have consented to the foregoing forum selection provisions. However, the enforceability of similar forum provisions in other companies’ certificates of incorporation has been challenged in legal proceedings, and it is possible that a court could find these types of provisions to be unenforceable.

We recognize that the forum selection clause in our certificate of incorporation may impose additional litigation costs on stockholders in pursuing any such claims, particularly if the stockholders do not reside in or near the State of Delaware. Additionally, the forum selection clause in our certificate of incorporation may limit our stockholders’ ability to bring a claim in a forum that they find favorable for disputes with us or our directors, officers or employees, which may discourage such lawsuits against us and our directors, officers and employees even though an action, if successful, might benefit our stockholders. Alternatively, if a court were to find the choice of forum provision contained in our certificate of incorporation to be inapplicable or unenforceable in an action, we may incur additional costs associated with resolving such action in other jurisdictions. The Court of Chancery of the State of Delaware and the federal district courts of the United States may also reach different judgments or results than would other courts, including courts where a stockholder considering an action may be located or would otherwise choose to bring the action, and such judgments may be more or less favorable to us than our stockholders.

Listing

Our common stock is listed on Nasdaq under the symbol “SNCY.”

Transfer Agent and Registrar

The transfer agent and registrar for our common stock is Broadridge Corporate Issuer Solutions.

Document

Exhibit 4.15

FIRST AMENDMENT TO TRUST INDENTURE AND MORTGAGE

([Reg. No.])

Dated as of December 30, 2024 between

SUN COUNTRY, INC.

and

WILMINGTON TRUST, NATIONAL ASSOCIATION,

not in its individual capacity, except as expressly stated herein,

but solely as Mortgagee

#4899-3486-5671

First Amendment to Trust Indenture And Mortgage

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[Reg. No.]

FIRST AMENDMENT TO

TRUST INDENTURE AND MORTGAGE

([Reg. No.])

This FIRST AMENDMENT TO TRUST INDENTURE AND MORTGAGE

([Reg. No.]) (this “First Indenture Amendment”), dated as of December 30, 2024, is made by and between SUN COUNTRY, INC., a Minnesota corporation (together with its successors and permitted assigns, the “Owner”), and WILMINGTON TRUST, NATIONAL ASSOCIATION, a national banking association, not in its individual capacity, except as expressly stated herein, but solely as Mortgagee hereunder (together with its successors hereunder, the “Mortgagee”).

W I T N E S S E T H:

WHEREAS, on the Closing Date, which occurred on [_]1, the Owner and the Mortgagee entered into that certain Trust Indenture and Mortgage ([Reg. No.]), dated as of [_]2, as supplemented by Indenture Supplement ([Reg. No.]) No. 1 thereto, dated [_]3, which was recorded by the FAA on [     ], and assigned Conveyance No. [     ] (the “Existing Indenture”), pursuant to which, among other things, the Owner issued to the Subordination Agent the Series A Equipment Notes, Series B Equipment Notes and the Series C Equipment Notes (as defined in the Existing Indenture);

WHEREAS, in connection with the Existing Indenture, the Owner, the Class A Trustee, the Class B Trustee, the Class C Trustee (as defined in the Existing Indenture), the Subordination Agent, and the Mortgagee entered into that certain Participation Agreement ([Reg. No.]), dated as of [_]4 (the “Existing Participation Agreement”), providing for the issuance by the Owner of the Series A Equipment Notes, Series B Equipment Notes and the Original Series C Equipment Notes (as defined below) secured by a security interest in the Owner’s right, title and interest in and to the Aircraft and certain other property described in the Existing Indenture (as further described in the Trust Indenture, the “Collateral”);

WHEREAS, the Original Series C Equipment Notes were redeemed and paid in full on December 15, 2023;

WHEREAS, Section 2.02 of the Existing Indenture provides that, subject to compliance with the conditions set forth in Section 4(a)(vi) of the Note Purchase Agreement, Section 2.02 of the Existing Participation Agreement and Section 9.1(c) or

1 To insert the relevant Closing Date.

2 To insert the relevant Closing Date.

3 To insert the relevant Closing Date.

4 To insert the relevant Closing Date.

1

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(d) of the Intercreditor Agreement (as in effect immediately prior to the Series C(R) Closing), the Owner shall have the option to issue new Series C Equipment bearing a designation distinct from the Original Series C Equipment Notes including as Additional Series Equipment Notes;

WHEREAS, the Owner now desires to re-issue such Equipment Notes to be

designated as “Series C(R)” by bearing on its face the designation “Series 2019-1C(R)” (such Equipment Notes, the “Series C Equipment Notes”), which Series C Equipment Notes are to be secured by a security interest in all right, title and interest of the Owner in and to the Aircraft and the other Collateral, and shall be deemed to be “Series C

Equipment Notes” for all purposes under the Existing Indenture as amended hereby;

WHEREAS, concurrently with the execution and delivery of this First Indenture Amendment, the Owner, WTNA, as Class A Trustee, Class B Trustee and Class C Trustee (as defined below), the Subordination Agent and the Mortgagee, entered into that certain First Amendment to Participation Agreement ([Reg. No.]), dated as of the date

hereof (the “First PA Amendment”), pursuant to which, among other things, Series C Equipment Notes will be issued to the Subordination Agent;

WHEREAS, in connection with such issuance of the Series C Equipment Notes and other transactions contemplated by the First PA Amendment, the Owner and the Mortgagee desire to amend the Existing Indenture to provide for the Owner’s issuance of Series C Equipment Notes on the terms provided herein and therein;

WHEREAS, all things have been done to make the Series C Equipment Notes, when executed by the Owner and authenticated and delivered by the Mortgagee, the valid, binding and enforceable obligations of the Owner; and

WHEREAS, all things necessary to make this First Indenture Amendment a legal, valid and binding obligation of the Owner have been done and performed and have occurred;

NOW, THEREFORE, in consideration of the mutual agreements contained herein, the parties hereto agree as follows:

ARTICLE I

Section 1.01    Issuance of Series C Equipment Notes. The Series C Equipment Notes being issued pursuant to the Existing Indenture, as amended by this First Indenture Amendment, shall be dated the date of issuance thereof, and shall be issued with the maturity date and in the original principal amount, and shall bear interest at the applicable Debt Rate, in each case as specified in Schedule I to the Existing Indenture, as such Schedule I is amended by this First Indenture Amendment. On the date hereof, each

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Series C Equipment Note shall be issued to the Subordination Agent on behalf of the Class C Pass Through Trust.

Section 1.02    Series C Equipment Notes Related Provisions. For the avoidance of doubt, the parties hereto agree that, from and after the date hereof, the Series C

Equipment Notes being issued as provided herein shall constitute “Series C Equipment Notes” and be included in “Equipment Notes” for all purposes of the Trust Indenture and the other Operative Agreements.

Section 1.03    Definitions.

(a)Except as otherwise defined herein, capitalized terms in this First Indenture Amendment have the meanings assigned to them in the Existing Indenture. For the purposes of this First Indenture Amendment, the following capitalized terms shall have the following meanings:

“Class C Pass Through Trust” means the Sun Country Pass Through Trust 2019- 1C(R) created pursuant to the Basic Pass Through Trust Agreement, as supplemented by the Class C Trust Supplement.

“Class C Trust Supplement” means the Trust Supplement No. 2019-1C(R), dated as of December 30, 2024, between the Owner and WTNA, as Class C Trustee.

“Class C Trustee” means the trustee for the Class C Pass Through Trust. “Original Series C Equipment Notes” means the Equipment Notes designated as

“Series C” by bearing on its face the designation “Series 2019-1C” that were issued

pursuant to the Existing Indenture.

(b)For purposes of this First Indenture Amendment, (i) the term “Trust Indenture” means the Existing Indenture as amended by this First Indenture Amendment and (ii) the term “Participation Agreement” means the Existing Participation Agreement as amended by the First PA Amendment.

(c)All references in this First Indenture Amendment to designated “Articles”, “Sections”, “Subsections”, “Schedules”, “Exhibits”, “Annexes” and other subdivisions are to the designated Article, Section, Subsection, Schedule, Exhibit, Annex or other subdivision of this First Indenture Amendment, unless otherwise specifically stated.

(d)The words “herein”, “hereof” and “hereunder” and other words of similar import refer to this First Indenture Amendment as a whole and not to any particular Article, Section, Subsection, Schedule, Exhibit, Annex or other subdivision.

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(e)Unless the context otherwise requires, whenever the words “including”, “include” or “includes” are used herein, they shall be deemed to be followed by the

phrase “without limitation”.

(f)All references in this First Indenture Amendment to a Person shall include successors and permitted assigns of such Person.

ARTICLE II

Section 2.01    Amendment to Section 5.02. Section 5.02(a) of the Existing Indenture is hereby amended by adding the following sentence at the end of such section:

“In addition, for the avoidance of doubt, the parties agree that it would not be commercially reasonable under the NY UCC, the Bankruptcy Code or any other applicable law for any agreement for the sale of Collateral to any buyer to be subject to any break-up fees or similar commercial arrangement (excluding third-party brokers fees) payable from the proceeds of the Collateral that could reasonably be expected to have a material adverse effect on the ability to enter into agreements for the sale of Collateral with any other buyer.”

provided that the amendment set forth in this Section 2.01 shall not be effective to the extent that it shall (or be deemed to) adversely affect the interests of any Note Holder, any Indenture Indemnitee or any Related Indenture Indemnitee in its capacity, solely as Note Holder, Indenture Indemnitee or Related Indenture Indemnitee, as the case may be.

ARTICLE III

Section 3.01    Amendment to Schedule I. Schedule I to the Existing Indenture is hereby amended by deleting the information with respect to the Original Series C Equipment Notes and replacing such information with Schedule I to this First Indenture Amendment (it being agreed and understood that no amendments are being made to the maturity date, original principal amount, Debt Rate, Make-Whole Spread or amortization schedule of the Series A Equipment Notes or Series B Equipment Notes).

ARTICLE IV

Section 4.01    Amendment to Annex A. Annex A to the Existing Indenture is amended as follows:

(a)The definition of “Class C Pass Through Trust” is deleted in its entirety and replaced with the following:

First Amendment to Trust Indenture And Mortgage

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“Class C Pass Through Trust” means the Sun Country Pass Through Trust 2019-1C(R) created pursuant to the Basic Pass Through Trust Agreement, as supplemented by Trust Supplement No. 2019-1C(R), dated as of December 30, 2024, between the Owner and WTNA, as Class C Trustee.

(b)The definition of “Debt Rate” is deleted in its entirety and replaced with the following:

“Debt Rate” means, with respect to (i) any Series of Equipment Notes, the rate per annum specified for such Series under the heading “Interest Rate” in Schedule I to the Trust Indenture (as amended, in the case of new Series C Equipment Notes issued pursuant to Section 2.02 of the Trust Indenture, at the time of issuance of such new Series C Equipment Notes and as amended, in the case of any Additional Series, at the time of original issuance of such Additional Series), and (ii) any other purpose, with respect to any period, the weighted average interest rate per annum during such period borne by the outstanding Equipment Notes, excluding any interest payable at the Payment Due Rate.

(c)The definition of “Intercreditor Agreement” is deleted in its entirety and replaced with the following:

“Intercreditor Agreement” means that certain Intercreditor Agreement among the Pass Through Trustees and the Subordination Agent, dated as of the Initial Closing Date, as amended by that certain Amendment to Intercreditor Agreement (2019-1C(R)) among the Pass Through Trustees, the Subordination Agent and the Owner, , as the same may be further amended, supplemented or otherwise modified from time to time in accordance with its terms, provided that for purposes of any obligation of Owner, no further amendment, modification or supplement to, or substitution or replacement of, such Intercreditor Agreement shall be effective unless consented to by Owner.

(d)The definition of “Pass-Through Trust Agreement” is deleted in its entirety and replaced with the following:

“Pass Through Trust Agreement” means each of the separate Trust Supplements, together in each case with the Basic Pass Through Trust Agreement, dated as of the Initial Closing Date in the case of the Trust Supplements related to the Series A Equipment Notes and Series B Equipment Notes and dated as of the Class C Issuance Date in the case of the Trust Supplement related to the Series C Equipment Notes, in each case by and between the Owner and a Pass Through Trustee, provided, that, for purposes of any obligation of Owner, no amendment, modification or

First Amendment to Trust Indenture And Mortgage

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supplement to, or substitution or replacement of, any such Agreement shall be effective unless consented to by Owner.

(e)The definition of “Payment Date” is deleted in its entirety and replaced with the following:

“Payment Date” means each December 15 and June 15, commencing with June 15, 2020 in the case of the Series A Equipment Notes, June 15, 2020 in the case of the Series B Equipment Notes, and June 15, 2025, in the case of the Series C Equipment Notes.

(f)The definition of “Series C” or “Series C Equipment Notes” is deleted in its entirety and replaced with the following:

“Series C” or “Series C Equipment Notes” means Equipment Notes issued under the Trust Indenture and designated as “Series C(R)” thereunder, in the Original Amount and maturities and bearing interest as specified in Schedule I to the Trust Indenture under the heading “Series C(R)”.

(g)The following definitions shall be added to Annex A to the Existing Indenture in alphabetical order:

“Amendment to Intercreditor Agreement” means that certain amendment to Intercreditor Agreement (2019-1C(R)), dated as of the Class C Issuance Date, among the Pass Through Trustee, the Subordination Agent and the Owner.

“Class C Issuance Date” means December 30, 2024.

ARTICLE V

Section 5.01    Effective Time of Amendments. The amendments to the Existing Indenture contemplated hereby and the agreements set forth herein shall be effective as of the time of the Series C Closing (as defined in the First PA Amendment).

Section 5.02    Ratification. Except as expressly amended hereby, the Existing Indenture shall remain in full force and effect in all respects, and this First Indenture Amendment shall be construed as supplemental to the Trust Indenture and shall form a part thereof.

Section 5.03    Severability. To the extent permitted by applicable law, any provision of this First Indenture Amendment that is prohibited or unenforceable in any jurisdiction shall, as to such jurisdiction, be ineffective to the extent of such prohibition or unenforceability without invalidating the remaining provisions hereof, and any such

First Amendment to Trust Indenture And Mortgage

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prohibition or unenforceability in any jurisdiction shall not invalidate or render unenforceable such provision in any other jurisdiction.

Section 5.04    No Oral Modification or Continuing Waivers. No terms or provisions of this First Indenture Amendment may be changed, waived, discharged or terminated orally, but only by an instrument in writing signed by the Owner and the Mortgagee in compliance with Article X of the Trust Indenture.

Section 5.05    Successors and Assigns. The terms and provisions contained herein shall bind and inure to the benefit of, and be enforceable by, each of the parties hereto and the successors and permitted assigns of each, all as provided herein and in the Trust Indenture.

Section 5.06    Headings. The headings of the various Articles and Sections herein are for convenience of reference only and shall not define or limit any of the terms or provisions hereof.

Section 5.07    Counterparts. This First Indenture Amendment may be executed in any number of counterparts (and each of the parties hereto shall not be required to execute the same counterpart). Each counterpart of this First Indenture Amendment including a signature page or pages executed by each of the parties hereto shall be an original counterpart of this First Indenture Amendment, but all of such counterparts together shall constitute one instrument.

Section 5.08    Governing Law. THIS FIRST INDENTURE AMENDMENT HAS BEEN DELIVERED IN THE STATE OF NEW YORK AND SHALL BE GOVERNED BY AND CONSTRUED IN ACCORDANCE WITH THE LAW OF THE STATE OF NEW YORK, INCLUDING ALL MATTERS OF CONSTRUCTION, VALIDITY AND PERFORMANCE.

Section 5.09    Submission to Jurisdiction. Each of the parties hereto, and by acceptance of the Equipment Notes, each Note Holder, to the extent it may do so under applicable law, for purposes hereof (a) irrevocably submits itself to the non-exclusive jurisdiction of the courts of the State of New York sitting in the City of New York and to the non-exclusive jurisdiction of the United States District Court for the Southern District of New York for the purposes of any suit, action or other proceeding arising out of this First Indenture Amendment, the subject matter hereof or any of the transactions contemplated hereby brought by any party or parties hereto or thereto, or their successors or permitted assigns and (b) waives, and agrees not to assert, by way of motion, as a defense, or otherwise, in any such suit, action or proceeding, that the suit, action or proceeding is brought in an inconvenient forum, that the venue of the suit, action or proceeding is improper or that this First Indenture Amendment or the Equipment Notes or the subject matter hereof or any of the transactions contemplated hereby may not be enforced in or by such courts.

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[Signature Pages Follow.]

IN WITNESS WHEREOF, the parties hereto have caused this First Indenture Amendment to be duly executed by their respective officers thereof duly authorized, as of the date first above written.

SUN COUNTRY, INC.

By:
	Name:
	Title:
WILMINGTON TRUST, NATIONAL ASSOCIATION, not in its individual capacity, except as expressly provided herein, but solely as Mortgagee
By:
	Name:
	Title:

Signature Page

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SCHEDULE I

to Second Indenture Amendment

Schedule I to Trust Indenture And Mortgage

	Original Amount	Interest Rate
Series C:	$[____________]	[ ]%

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SCHEDULE I

to Second Indenture Amendment

Trust Indenture and Mortgage Equipment Note Amortization

Series C Equipment Note Amortization

Payment Date	Percentage of Original Principal Amount to be Paid

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Document

Exhibit 4.16

FIRST AMENDMENT TO PARTICIPATION AGREEMENT ([Reg. No.])

Dated as of December 30, 2024 among

SUN COUNTRY, INC.,

WILMINGTON TRUST, NATIONAL ASSOCIATION,

as Pass Through Trustee under each of the Pass Through Trust Agreements,

WILMINGTON TRUST, NATIONAL ASSOCIATION,

as Subordination Agent,

WILMINGTON TRUST, NATIONAL ASSOCIATION,

as Mortgagee, and

WILMINGTON TRUST, NATIONAL ASSOCIATION,

in its individual capacity as set forth herein

*

One [Aircraft Manufacturer and Model]

(Generic Manufacturer and Model [Generic Manufacturer and Model]) Aircraft

U.S. Registration No. [Reg. No.]

First Amendment to Participation Agreement (Sun Country 2019-1 Aircraft EETC)

[Reg. No.]

#4932-1612-2119

Table of Contents

	ARTICLE I	Page
	DEFINITIONS; AMENDMENTS
Section 1.01.	Definitions	3
Section 1.02.	Other Definitional Provisions	4
Section 1.03.	Amendments to Existing Participation Agreement	4
Section 1.04.	Supplemental Provisions	5
	ARTICLE II
	THE LOANS
Section 2.01.	The Loans	5
Section 2.02.	Issuance of Series C Equipment Notes	6
Section 2.03.	The Series C Closing	6
	ARTICLE III
	CONDITIONS PRECEDENT
Section 3.01.	Conditions Precedent to Obligations of the Pass Through Trustees	6
Section 3.02.	Conditions Precedent to Obligations of the Owner	7
	ARTICLE IV
	REPRESENTATIONS AND WARRANTIES OF THE OWNER
Section 4.01.	Representations and Warranties of the Owner	8
	ARTICLE V
	REPRESENTATIONS, WARRANTIES AND COVENANTS OF WTNA
Section 5.01.	Representations, Warranties and Covenants of WTNA	9

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	ARTICLE VI
	MISCELLANEOUS
Section 6.01.	Effective Time	10
Section 6.02.	Ratification and Agreements; Direction	10
Section 6.03.	Survival of Representations, Warranties, Covenants and Agreements	10
Section 6.04.	Governing Law	11
Section 6.05.	Severability	11
Section 6.06.	No Oral Modifications or Continuing Waivers; Consents	11
Section 6.07.	Effect of Headings and Table of Contents	11
Section 6.08.	Successors and Assigns.	11
Section 6.09.	Benefits of Agreement	11
Section 6.10.	Counterparts	12
Section 6.11.	Submission to Jurisdiction	12

Schedule I    - Amendment to Schedule 2: Commitments

Exhibit A    - Form of First Indenture Amendment

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FIRST AMENDMENT TO PARTICIPATION AGREEMENT

([Reg. No.])

This FIRST AMENDMENT TO PARTICIPATION AGREEMENT ([Reg. No.])

(this “Amendment”), dated as of December 30, 2024, is made by and among SUN COUNTRY, INC., a Minnesota corporation (together with its successors and permitted assigns, the “Owner”), WILMINGTON TRUST, NATIONAL ASSOCIATION, a

national banking association (in its individual capacity, together with its successors and permitted assigns, “WTNA”), not in its individual capacity except as otherwise expressly provided in any of the Operative Agreements or the Pass Through Documents, but solely as Pass Through Trustee under each of the Pass Through Trust Agreements (such terms and other capitalized terms used herein without definition being defined as provided in Section 1.01), WILMINGTON TRUST, NATIONAL ASSOCIATION, a national

banking association, as subordination agent and trustee (in such capacity, together with any successor trustee in such capacity, the “Subordination Agent”) under the Intercreditor Agreement, and WILMINGTON TRUST, NATIONAL ASSOCIATION, a national banking association, as mortgagee (in such capacity, together with any successor trustee in such capacity, the “Mortgagee”) under the Indenture.

W I T N E S S E T H:

WHEREAS, on the Closing Date, which occurred on [_]1, the parties hereto (other than the Class C Trustee) entered into that certain Participation Agreement ([Reg. No.]), dated as of [_]2 (the “Existing Participation Agreement”) in order to provide for the financing of the Aircraft described therein;

WHEREAS, in connection with the Existing Participation Agreement, the Owner and the Mortgagee entered into that certain Indenture and Security Agreement ([Reg.

No.]), dated as of [_]3 , as supplemented by Indenture Supplement ([Reg. No.]) No. 1 thereto, dated [_]4 (the “Existing Indenture”), pursuant to which, among other things, the Owner issued to the Subordination Agent the Series A Equipment Notes, Series B Equipment Notes and the Original Series C Equipment Notes, in each case in the applicable original principal amount, having the applicable maturity and bearing interest at the applicable Debt Rate as specified on Schedule I to the Existing Indenture, which

1 To insert relevant Closing Date.

2 To insert relevant Closing Date.

3 To insert relevant Closing Date.

4 To insert relevant Closing Date.

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such Equipment Notes are secured by a security interest in all right, title and interest of the Owner in and to the Aircraft and certain other property described in the Indenture (the “Collateral”);

WHEREAS, the Series C Equipment Notes were repaid in full on December 15,

2023;

WHEREAS, Section 2.02 of the Existing Participation Agreement provides that,

subject to Section 4(a)(vi) of the Note Purchase Agreement (as in effect immediately prior to the Series C Closing) and Section 9.1(c) or (d) of the Intercreditor Agreement (as in effect immediately prior to the Series C Closing), the Owner shall have the option to issue new Series C Equipment Notes bearing a designation distinct from the Original Series C Equipment Notes include as Additional Series Equipment Notes;

WHEREAS, the Owner now desires to issue such new Equipment Notes to be

designated as “Series C(R)” by bearing on its face the designation “Series 2019-1C(R)” (such new Equipment Notes, the “Series C Equipment Notes”), which Series C Equipment Notes are to be secured by a security interest in all right, title and interest of the Owner in and to the Aircraft and the other Collateral;

WHEREAS, concurrently with the execution and delivery of this Amendment, the Owner and the Mortgagee are entering into the First Indenture Amendment, pursuant to which, among other things, the Owner will issue Series C Equipment Notes under the Indenture;

WHEREAS, pursuant to the Basic Pass Through Trust Agreement and the Class C Trust Supplement, the Class C Pass Through Trust has been created to facilitate certain of the transactions contemplated by this Amendment, including, without limitation, the issuance and sale of the Class C Certificates; and

WHEREAS, pursuant to the Intercreditor Agreement, the Subordination Agent holds the Series A Equipment Notes on behalf of the Class A Pass Through Trust and the Series B Equipment Notes on behalf of the Class B Pass Through Trust and will hold, when issued, the Series C Equipment Notes on behalf of the Class C Pass Through Trust;

NOW, THEREFORE, in consideration of the foregoing premises and the mutual agreements herein contained, and of other good and valuable consideration the receipt and adequacy of which are hereby acknowledged, the parties hereto agree as follows:

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ARTICLE I

DEFINITIONS; AMENDMENTS

Section 1.01. Definitions. Except as otherwise defined herein, capitalized terms in this Amendment have the meanings assigned to them in the Existing Participation Agreement. For the purposes of this Amendment, the following capitalized terms shall have the following meanings:

“Class C Pass Through Trust” means the Sun Country Pass Through Trust 2019- 1C(R) created pursuant to the Basic Pass Through Trust Agreement, as supplemented by the Class C Trust Supplement.

“Class C Trust Supplement” means the Trust Supplement No. 2019-1C(R), dated as of the Series C Closing Date, between the Owner and WTNA, as Class C Trustee.

“Class C Trustee” means the trustee for the Class C Pass Through Trust. “Collateral” has the meaning set forth in the second recital hereto. “Existing Indenture” has the meaning set forth in the second recital hereto.

“Existing Participation Agreement” has the meaning set forth in the first recital

hereto.

“Original Series C Equipment Notes” means the Equipment Notes designated as

“Series C” by bearing on its face the designation “Series 2019-1C” that were issued pursuant to the Existing Indenture and were repaid in full on December 15, 2023.

“Pass Through Trust Agreement” means each of the Class A Trust Supplement, Class B Trust Supplement and the Class C Trust Supplement, together in each case with the Basic Pass Through Trust Agreement, as the same may be amended, supplemented or otherwise modified from time to time in accordance with its terms.

“Pass Through Trustee” means each of the Class A Trustee, Class B Trustee and the Class C Trustee.

“First Indenture Amendment” means an amendment to the Existing Indenture, substantially in the form attached hereto as Exhibit A.

“Series C Closing” has the meaning set forth in Section 2.03. “Series C Closing Date” means December 30, 2024.

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“Trust Supplement” means each of the Class A Trust Supplement, Class B Trust Supplement and the Class C Trust Supplement.

Section 1.02. Other Definitional Provisions.

(a)For purposes of this Amendment, (i) the term “Participation Agreement” means the Existing Participation Agreement as amended by this Amendment and (ii) the term “Trust Indenture” means the Existing Indenture as amended by the First Indenture Amendment.

(b)All references in this Amendment to designated “Articles”, “Sections”, “Subsections”, “Schedules”, “Exhibits”, “Annexes” and other subdivisions are to the designated Article, Section, Subsection, Schedule, Exhibit, Annex or other subdivision of this Amendment, unless otherwise specifically stated.

(c)The words “herein”, “hereof” and “hereunder” and other words of similar import refer to this Amendment as a whole and not to any particular Article, Section, Subsection, Schedule, Exhibit, Annex or other subdivision.

(d)All references in this Amendment to a “government” are to such government and any instrumentality or agency thereof.

(e)Unless the context otherwise requires, whenever the words “including”, “include” or “includes” are used herein, they shall be deemed to be followed by the phrase “without limitation”.

(f)All references in this Amendment to a Person shall include successors and permitted assigns of such Person.

Section 1.03. Amendments to Existing Participation Agreement.    The Existing Participation Agreement is hereby amended as follows:

(a)Amendment to Section 2.1. Section 2.1 of the Existing Participation Agreement is amended by deleting it in its entirety and replacing it with the following:

“Section 2.1. Making of Loans and Issuance of Equipment Notes.

Subject to the terms and conditions of this Agreement, on the date hereof or on such other date agreed to by the parties hereto, in the case of the Series A Equipment Notes and Series B Equipment Notes, or on the Class C Issuance Date, in the case of the Series C Equipment Notes (the “Closing Date”):

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(a)Each Applicable Pass Through Trustee listed on Schedule 2 shall make a secured loan to the Owner in the amount in Dollars opposite such Trustee's name on Schedule 2; and

(b)The Owner shall issue, pursuant to and in accordance with the provisions of Article II of the Trust Indenture, to the Subordination Agent as the registered holder on behalf of each such Applicable Pass Through Trustee, one or more Equipment Notes, dated the applicable Closing Date, of the Series set forth opposite such Trustee's name on Schedule 2, in an aggregate principal amount equal to the amount of the secured loan made by each such Applicable Pass Through Trustee.

In addition, the Owner shall have the option after the applicable Closing Date to repay and reissue Series B Equipment Notes or Series C Equipment Notes and to issue (and repay and reissue) from time to time Additional Series Equipment Notes, subject to the terms of the Note Purchase Agreement and the Intercreditor Agreement. If Series B, Series C or Additional Series Equipment Notes are so reissued or issued after the applicable Closing Date, the Note Holder of such Equipment Notes shall be entitled to execute a counterpart to this Agreement and become a party hereto.”

(b)Amendment to Schedule 2. Schedule 2 to the Existing Participation Agreement is amended by deleting the information with respect to the Original Series C Equipment Notes and replacing such information for the Series C Equipment Notes with Schedule I hereto.

Section 1.04. Supplemental Provisions. For the avoidance of doubt, Articles II through VI of this Amendment are supplemental to, and not in replacement of, Sections 2 through 6 of the Existing Participation Agreement, which shall remain in full force and effect.

ARTICLE II

THE LOANS

Section 2.01. The Loans. Subject to the terms and conditions of this Amendment and the Trust Indenture, on the Series C Closing Date, the Class C Trustee shall make a loan to the Owner by paying to the Owner the aggregate original principal amounts of the Series C Equipment Notes being issued to the Class C Pass Through Trust, as set forth on Schedule I hereto opposite “2019-1C(R)”. The Class C Trustee, on behalf of the Class C Pass Through Trust, shall make its loan to the Owner no later than 10:00 a.m. (New York City time) on the Series C Closing Date by transferring such amount in immediately

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available funds to the Owner at its account set forth in Schedule 1 of the Existing Participation Agreement or as otherwise notified to the Class C trustee.

Section 2.02. Issuance of Series C Equipment Notes. Upon the occurrence of the above payment by the Class C Trustee to the Owner, the Owner shall issue, pursuant to and in accordance with Article II of the Trust Indenture, to the Subordination Agent as agent and trustee for the Class C Trustee, one or more Series C Equipment Notes of the aggregate original principal amount and bearing the interest rate set forth in Schedule I of the First Indenture Amendment. Each such Series C Equipment Note shall be duly authenticated by the Mortgagee pursuant to the Trust Indenture, registered in the name of the Subordination Agent and dated the Series C Closing Date and shall be delivered by the Mortgagee to the Subordination Agent. Each of the Pass Through Trustees and the Subordination Agent hereby authorizes and directs the Mortgagee to execute and deliver this Amendment and the First Indenture Amendment and, subject to the terms hereof and thereof, to take the actions contemplated herein and therein.

Section 2.03. The Series C Closing. The closing (the “Series C Closing”) of the transactions contemplated hereby shall take place at the offices of Milbank LLP, 55 Hudson Yards, New York, New York 10001 at 10:00 a.m. (New York City time) on December 30, 2024, or at such other time or place as the parties shall agree.

ARTICLE III

CONDITIONS PRECEDENT

Section 3.01. Conditions Precedent to Obligations of the Pass Through Trustees. The obligations of each Pass Through Trustee hereunder, including the obligation of the Class C Trustee to make the loan contemplated to be made by it pursuant to Article II, are subject to the fulfillment (or the waiver by such Pass Through Trustee) prior to or on the Series C Closing Date of the following conditions precedent:

(a)Authentication. The Owner shall have tendered the Series C Equipment Notes being issued on the Series C Closing Date to the Mortgagee for authentication, and the Mortgagee shall have authenticated such Series C Equipment Notes and shall have tendered such Series C Equipment Notes to the Subordination Agent on behalf of the Class C Trustee, against receipt of the loan proceeds, in accordance with Section 2.02.

(b)Documentation. This Amendment and the following documents shall have been duly authorized, executed and delivered by the respective party or parties thereto (other than the Pass Through Trustees or the Mortgagee), shall be in full force and effect and executed counterparts thereof shall have been delivered to each Pass Through Trustee:

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(i)the Amendment to Intercreditor Agreement (2019-1C(R)), dated as of the date hereof, among the Pass Through Trustees, the Subordination Agent and the Owner;

(ii)the Class C Trust Supplement; and

(iii)the First Indenture Amendment.

(c)Representations; No Event of Default or Event of Loss. On the Series C Closing Date, the following statements shall be correct: (i) the representations and warranties herein of the Owner are correct in all material respects as though made on and as of such date, except to the extent that such representations and warranties relate solely to an earlier date (in which case such representations and warranties are correct on and as of such earlier date) and (ii) no event has occurred and is continuing that constitutes an Event of Default or an Event of Loss with respect to the Aircraft or would constitute an Event of Default or such an Event of Loss but for the requirement that notice be given or time elapse or both.

Promptly upon the recording of the First Indenture Amendment pursuant to the Transportation Code and the receipt of appropriate and correct recording information from the FAA, the Owner will cause McAfee & Taft, special FAA counsel in Oklahoma City, Oklahoma to deliver to the Subordination Agent, to the Pass Through Trustees, to the Mortgagee and to the Owner an opinion as to the due recording of such instrument and the lack of filing of any intervening documents with respect to the Aircraft (other than filings in respect of the Existing Indenture).

Section 3.02. Conditions Precedent to Obligations of the Owner. The obligation of the Owner to issue and sell the Series C Equipment Notes is subject to the fulfillment (or waiver by the Owner) prior to or on the Series C Closing Date of the following conditions precedent:

(a)Documentation. The documents referred to in Section 3.01(b) shall have been duly authorized, executed and delivered by the respective party or parties thereto (other than the Owner), shall be in full force and effect and executed counterparts (or copies thereof where indicated) thereof shall have been delivered to the Owner, and the Owner shall have received such documents and evidence with respect to WTNA, the Mortgagee, the Subordination Agent and each Pass Through Trustee as the Owner may reasonably request in order to establish the consummation of the transactions contemplated by this Amendment, the taking of all corporate and other proceedings in connection therewith and compliance with the conditions herein set forth.

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(b)Payment for Series C Equipment Notes. The Owner shall have been paid by the Class C Trustee the aggregate original principal amount of the Series C Equipment Notes being issued to the Class C Trustee as set forth on Schedule I hereto opposite “2019-1C(R)”.

ARTICLE IV

REPRESENTATIONS AND WARRANTIES OF THE OWNER

Section 4.01. Representations and Warranties of the Owner.    The Owner represents and warrants that:

(a)Valid and Binding Agreements. This Amendment, the First Indenture Amendment, the Series C Equipment Notes and each other Operative Agreement to which the Owner is a party have been duly executed and delivered by the Owner and constitute the legal, valid and binding obligations of the Owner enforceable against the Owner in accordance with their terms, except as the same may be limited by bankruptcy, insolvency, reorganization, moratorium or other similar laws affecting the rights of creditors generally and by general principles of equity and except, in the case of the Trust Indenture, as limited by applicable laws that may affect the remedies provided in the Trust Indenture, which laws, however, do not make the remedies provided in the Trust Indenture inadequate for the practical realization of the rights and benefits intended to be provided thereby.

(b)Filings and Recordation. Except for the filing for recordation pursuant to the Transportation Code of the First Indenture Amendment, no further filing or recording of any document is necessary under the laws of the United States or any state thereof as of the Series C Closing Date in order to establish and perfect the security interest in the Aircraft created under the Trust Indenture (as supplemented by the Indenture Supplement covering the Aircraft) in favor of the Mortgagee as against the Owner and any third parties in any applicable jurisdiction in the United States.

(c)Title. As of the Series C Closing Date, (i) the Owner has good title to the Aircraft, free and clear of Liens other than Permitted Liens, (ii) the Aircraft has been duly certified by the FAA (subject only to the Owner’s receipt of the applicable certificate from the FAA) as to type and airworthiness in accordance with the terms of the Trust Indenture, (iii) the Existing Indenture has been duly recorded (or duly filed for recordation) with the FAA pursuant to the Transportation Code, (iv) the First Indenture Amendment has been duly filed for recordation (or shall be in the process of being so duly filed for recordation) with the FAA pursuant to the Transportation Code, (v) the Aircraft is duly registered with the FAA in the name of the Owner and (vi) the registration of the International Interests created

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under the Trust Indenture with respect to the Aircraft has been effected (or is in the process of being effected) on the International Registry in accordance with the Cape Town Treaty.

(d)Section 1110. The Mortgagee is entitled to the benefits of Section 1110 with respect to the Aircraft subject to the Lien of the Trust Indenture on the Series C Closing Date.

(e)Security Interest. The Trust Indenture creates in favor of the Mortgagee, for the benefit of the Note Holders, the Indenture Indemnitees and the Related Indenture Indemnitees, a valid and perfected Lien on the Aircraft subject to the Lien of the Trust Indenture on the Series C Closing Date, subject to no equal or prior Lien, except Permitted Liens. There are no Liens of record with the FAA on the Aircraft subject to the Lien of the Trust Indenture on the Series C Closing Date other than the Lien of the Trust Indenture and any Permitted Liens arising pursuant to clause (a) of the definition thereof. Other than (x) the International Interests created under the Trust Indenture and (y) any International Interests that appear on the International Registry as having been discharged, no International Interests with respect to the Aircraft have been registered on the International Registry as of the Series C Closing Date.

(f)No Prior Amendments or Supplements. Except for the documents described in Section 3.01(b) of this Amendment, there have been no amendments or supplements to the documents referred to in Section 3.01(b) of the Existing Participation Agreement.

ARTICLE V

REPRESENTATIONS, WARRANTIES AND COVENANTS OF WTNA

Section 5.01. Representations, Warranties and Covenants of WTNA. WTNA, generally, and each of the Mortgagee, the Subordination Agent and the Pass Through Trustee as it relates to it, represents, warrants and covenants that:

(a)Valid and Binding Agreements. This Amendment, the First Indenture Amendment, the Series C Equipment Notes, each other Operative Agreement and each Pass Through Document to which WTNA, the Mortgagee, the Subordination Agent or any Pass Through Trustee is a party have been duly executed and delivered by WTNA, individually and in its capacity as Mortgagee, Subordination Agent or Pass Through Trustee, as the case may be, and constitute the legal, valid and binding obligations of WTNA, the Mortgagee, the Subordination Agent and each Pass Through Trustee, to the extent it is a party

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thereto, enforceable against it in accordance with its terms, except as the same may be limited by bankruptcy, insolvency, reorganization, moratorium or other similar laws affecting the rights of creditors generally and by general principles of equity.

ARTICLE VI

MISCELLANEOUS

Section 6.01. Effective Time. The amendments to the Existing Participation Agreement contemplated hereby and the agreements set forth herein shall be effective as of the time of the Series C Closing. Effective as of the time of the Series C Closing, WTNA, as Class C Trustee, and WTNA, as Subordination Agent and as Note Holder of the Series C Equipment Notes, each shall be deemed to be a party to the Participation Agreement and shall have all of the rights and obligations of a “Pass Through Trustee”, a “Note Holder”, an “Indemnitee” and “Indenture Indemnitee”, as applicable, under the Participation Agreement and the other Operative Agreements.

Section 6.02. Ratification and Agreements; Direction. Except as expressly amended hereby, the Existing Participation Agreement shall remain in full force and effect, and this Amendment shall be construed as supplemental to the Participation Agreement and shall form a part thereof. For the avoidance of doubt, the parties hereto agree that, from and after the date hereof, the Series C Equipment Notes referred to herein shall constitute the “Series C Equipment Notes” and “Equipment Notes”, the Class C Certificates referred to herein shall constitute “Class C Certificates” and “Pass Through Certificates”, the Class C Pass Through Trust referred to herein shall constitute the “Class C Pass Through Trust” and a “Pass Through Trust” and the Class C Trustee referred to herein shall constitute the “Class C Trustee” and a “Pass Through Trustee”, in each case for all purposes of the Participation Agreement, the Trust Indenture and the other Operative Agreements. The Subordination Agent, as record holder of the Equipment Notes, hereby authorizes, empowers and instructs the Mortgagee to enter into, execute, deliver and perform its obligations under this Amendment and the First Indenture Amendment, and each other document, instrument or writing as may be contemplated by, or necessary or convenient in connection with, any of the foregoing.

Section 6.03. Survival of Representations, Warranties, Covenants and Agreements. Except as otherwise provided for herein, the representations, warranties, covenants and agreements of the Owner, WTNA, the Mortgagee, the Subordination Agent, each Pass Through Trustee and the Note Holders provided for in this Amendment, and each of their obligations hereunder, shall survive the making of the loans, any return of the Aircraft, the transfer of any interest by any Note Holder of its Equipment Note and the expiration or termination (to the extent arising out of acts or events occurring prior to such expiration) of this Amendment, the First Indenture Amendment or any other Operative Agreement.

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Section 6.04. Governing Law. THIS AMENDMENT HAS BEEN DELIVERED IN THE STATE OF NEW YORK AND SHALL BE GOVERNED BY AND CONSTRUED IN ACCORDANCE WITH THE LAW OF THE STATE OF NEW YORK, INCLUDING ALL MATTERS OF CONSTRUCTION, VALIDITY AND PERFORMANCE.

Section 6.05. Severability. To the extent permitted by applicable law, any provision of this Amendment which is prohibited or unenforceable in any jurisdiction shall, as to such jurisdiction, be ineffective to the extent of such prohibition or unenforceability without invalidating the remaining provisions hereof, and any such prohibition or unenforceability in any jurisdiction shall not invalidate or render unenforceable such provision in any other jurisdiction.

Section 6.06. No Oral Modifications or Continuing Waivers; Consents. Subject to Article X of the Trust Indenture, no terms or provisions of this Amendment may be changed, waived, discharged or terminated orally, but only by an instrument in writing signed by the party against which the enforcement of the change, waiver, discharge or termination is sought; provided that no such change, waiver, discharge or termination shall be effective unless a signed copy thereof is delivered to the Mortgagee.

Section 6.07. Effect of Headings and Table of Contents. The headings of the various Articles and Sections herein and in the Table of Contents are for convenience of reference only and shall not define or limit any of the terms or provisions hereof.

Section 6.08. Successors and Assigns. All covenants, agreements, representations and warranties in this Amendment by the Owner, by WTNA, individually or as Mortgagee, Subordination Agent or Pass Through Trustee, or by any Note Holder, shall bind and inure to the benefit of and be enforceable by the Owner, and subject to the terms of Section 6.1.3(c) of the Existing Participation Agreement, its successors and permitted assigns, each Pass Through Trustee and any successor or other trustee under the Pass Through Trust Agreement to which it is a party, the Subordination Agent and its successor under the Intercreditor Agreement and the Mortgagee and its successor under the Trust Indenture, whether so expressed or not.

Section 6.09. Benefits of Agreement. Nothing in this Amendment, express or implied, shall give to any Person, other than the parties hereto and their successors hereunder, any benefit or any legal or equitable right, remedy or claim under this Amendment, except as provided expressly herein. The Owner agrees and acknowledges that the Indemnitees that are not parties to the Participation Agreement are third party beneficiaries of the indemnities by the Owner contained in Section 8.1 of the Participation Agreement, and that such Persons may rely on such indemnities, representations and warranties or covenants and agreements, as the case may be, to the same extent as if such

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indemnities, representations and warranties or covenants and agreements were made to such Indemnitees directly.

Section 6.10. Counterparts. This Amendment may be executed in any number of counterparts (and each of the parties hereto shall not be required to execute the same counterpart). Each counterpart of this Amendment including a signature page or pages executed by each of the parties hereto shall be an original counterpart of this Amendment, but all of such counterparts shall together constitute one instrument.

Section 6.11. Submission to Jurisdiction. Each of the parties hereto, to the extent it may do so under applicable law, for purposes hereof (a) irrevocably submits itself to the non-exclusive jurisdiction of the courts of the State of New York sitting in the City of New York and to the non-exclusive jurisdiction of the United States District Court for the Southern District of New York for the purposes of any suit, action or other proceeding arising out of this Amendment, the subject matter hereof or any of the transactions contemplated hereby brought by any party or parties hereto or thereto, or their successors or permitted assigns and (b) waives, and agrees not to assert, by way of motion, as a defense, or otherwise, in any such suit, action or proceeding, that the suit, action or proceeding is brought in an inconvenient forum, that the venue of the suit, action or proceeding is improper or that this Amendment or the subject matter hereof or any of the transactions contemplated hereby may not be enforced in or by such courts.

[Signature Pages Follow.]

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IN WITNESS WHEREOF, the parties hereto have caused this Amendment to be duly executed by their respective officers thereunto duly authorized as of the date first above written.

SUN COUNTRY, INC.
By:
	Name:
	Title:
WILMINGTON TRUST, NATIONAL ASSOCIATION, as Pass Through Trustee under each of the Pass Through Trust Agreements
By:
	Name:
	Title:
WILMINGTON TRUST, NATIONAL ASSOCIATION, as Subordination Agent
By:
	Name:
	Title:
WILMINGTON TRUST, NATIONAL ASSOCIATION, as Mortgagee
By:
	Name:
	Title:
WILMINGTON TRUST, NATIONAL ASSOCIATION, in its individual capacity solely as expressly set forth herein
By:
	Name:
	Title:

Signature Page

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SCHEDULE I to FIRST AMENDMENT TO PARTICIPATION AGREEMENT

AMENDED SCHEDULE 2

to PARTICIPATION AGREEMENT

COMMITMENTS

Pass Through Trustee	Series C Equipment Notes	Dollar Amount of Loan
2019-1C(R)	Series C(R)	$[ ]]

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EXHIBIT A to FIRST AMENDMENT TO PARTICIPATION AGREEMENT

FORM OF FIRST INDENTURE AMENDMENT

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Document

Exhibit 4.17

EXECUTION VERSION

AMENDMENT TO INTERCREDITOR AGREEMENT

AMENDMENT TO INTERCREDITOR AGREEMENT (2019-1C(R)) dated as

of December 30, 2024 (this “Amendment”) is made by and among WILMINGTON TRUST, NATIONAL ASSOCIATION, a Delaware trust company, not in its individual capacity but solely as Trustee (the “Class A Trustee”) under the Sun Country Pass Through Trust 2019-1A (the “Class A Trust”), Trustee (the “Class B Trustee”) under the Sun Country Pass Through Trust 2019-1B (the “Class B Trust”) and Trustee (the “Class C(R) Trustee”) under the Sun Country Pass Through Trust 2019-1C(R) (the “Class C(R) Trust”), WILMINGTON TRUST, NATIONAL ASSOCIATION, not in its individual capacity except as expressly set forth herein but solely as Subordination Agent and SUN COUNTRY, INC., a Delaware corporation (“Sun Country”).

W I T N E S S E T H:

WHEREAS, the Class A Trustee, the Class B Trustee, the Class C Trustee and the Subordination Agent are parties to the Intercreditor Agreement (2019-1), dated as of December 9, 2019 (the “Existing Agreement”);

WHEREAS, on December 9, 2019, Sun Country caused the Class A Trustee, the Class B Trustee and the Class C Trustee to issue and sell an aggregate face amount of

$[    ] of Class A Certificates, $[    ] of Class B Certificates and $[    ] of Class C Certificates, the proceeds from the sale of which were used by the Class A Trustee, the Class B Trustee and the Class C Trustee to purchase Series A Equipment Notes, Series B Equipment Notes and Series C Equipment Notes, respectively, issued by Sun Country and secured by the Aircraft in accordance with that certain Note Purchase Agreement, dated as of December 9, 2019 (the “Note Purchase Agreement”);

WHEREAS, the Series C Equipment Notes and the Class C Certificates were paid in full on December 15, 2023;

WHEREAS, on December 30, 2024 (the “Class C(R) Certificate Issuance Date”), Sun Country intends to refinance the Series C Equipment Notes;

WHEREAS, on the Class C(R) Certificate Issuance Date, new Series C Equipment Notes (designated as “Series C(R) Equipment Notes”) will be issued in accordance with Section 4(a)(vi) of the Note Purchase Agreement and Section 9.1(c) of the Existing Agreement;

WHEREAS, pursuant to each Indenture, Sun Country will issue on a recourse basis a single series of Series C(R) Equipment Notes to refinance the related Aircraft;

WHEREAS, on the Class C(R) Certificate Issuance Date, Sun Country will enter into the Class C(R) Trust Agreement (as defined below) to establish the Class C(R) Trust;

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WHEREAS, on the Class C(R) Certificate Issuance Date, the Class C(R) Trust will acquire the Series C(R) Equipment Notes having an interest rate equal to the Stated Interest Rate applicable to the Class C(R) Certificates to be issued by the Class C(R) Trust;

WHEREAS, pursuant to the Class C(R) Trust Agreement, the Class C(R) Trust will issue a single class of Class C(R) Certificates having the interest rate and the final distribution date described in the Class C(R) Trust Agreement on the terms and subject to the conditions set forth therein;

WHEREAS, Section 9.1(c) of the Existing Agreement provides that, in connection with such issuance of Class C(R) Certificates, the Existing Agreement shall be amended by written agreement of Sun Country and the Subordination Agent to give effect to such issuance and to provide for the subordination of the Class C(R) Certificates to the Administration Expenses, the Class A Certificates, the Class B Certificates and otherwise as provided therein;

WHEREAS, the parties hereto wish to amend the Existing Agreement pursuant to Section 9.1(c) thereof to give effect to the issuance of the Series C(R) Equipment Notes and the Class C(R) Certificates pursuant to the Indentures and the Class C(R) Trust; and

WHEREAS, Sun Country has obtained a Ratings Confirmation relating to the issuance of the Class C(R) Certificates and this Amendment, as required by Section 9.1(c) of the Existing Agreement.

NOW, THEREFORE, in consideration of the mutual agreements herein contained, and for other good and valuable consideration, the receipt and adequacy of which are hereby acknowledged, the parties hereto agree as follows:

Section 1. Definitions. Capitalized terms and phrases used and not otherwise defined herein shall for all purposes of this Amendment, including the recital of the parties and the other preceding recitals, have the respective meanings specified therefor in the Existing Agreement.

Section 2.    Amendment. Effective as of the date hereof, the Existing Agreement shall be amended as follows:

(a)all references to “this Agreement” in the Intercreditor Agreement shall be deemed to refer to the Existing Agreement as amended by this Amendment, and all references in the Existing Agreement or in any other Operative Agreement to the Intercreditor Agreement shall be deemed to refer to the Existing Agreement as amended by this Amendment;

(b)the Class C(R) Trustee shall be added as a party to the Intercreditor Agreement and the Class C Trustee shall be removed as a party to the Intercreditor Agreement;

(c)Section 1.1 of the Existing Agreement shall be amended by adding in alphabetical order within said Section the following new definitions:

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“Amendment to Intercreditor Agreement” means that certain Amendment to Intercreditor Agreement (2019-1C(R)), dated as of the Class C(R) Certificate Issuance Date, by and among the Class A Trustee, the Class B Trustee, the Class C(R) Trustee, Sun Country and Wilmington Trust, National Association, not in its individual capacity except as expressly set forth therein but solely as Subordination Agent.

“Class C(R) Certificate Issuance Date” means December 30, 2024.

“Class C(R) Certificate Purchase Agreement” means the Certificate Purchase Agreement, dated as December 30, 2024, among Sun Country, the purchasers therein, and Wilmington Trust, National Association, not in its individual capacity but solely as Class C(R) Trustee, as the same may be amended, supplemented or otherwise modified from time to time in accordance with its terms.

“Class C(R) Certificateholder” means, at any time, any Certificateholder of one or more Class C(R) Certificates.

“Class C(R) Certificates” means the certificates issued by the Class C(R) Trust, substantially in the form of Exhibit A to the Class C(R) Trust Agreement, and authenticated by the Class C(R) Trustee, representing Fractional Undivided Interests in the Class C(R) Trust, and any certificates issued in exchange therefor or replacement thereof pursuant to the terms of the Class C(R) Trust Agreement.

“Class C(R) Trust” means the Sun Country Pass Through Trust 2019- 1C(R) created and administered pursuant to the Class C(R) Trust Agreement.

“Class C(R) Trust Agreement” means the Basic Agreement, as supplemented by Trust Supplement No. 2019-1C(R) thereto, dated as of the Class C(R) Certificate Issuance Date, governing the creation and administration of the Class C(R) Trust and the issuance of the Class C(R) Certificates, as the same may be amended, supplemented or otherwise modified from time to time in accordance with its terms.

“Class C(R) Trustee” means WTNA, not in its individual capacity except as expressly set forth in the Class C(R) Trust Agreement, but solely as trustee under the Class C(R) Trust Agreement, together with any successor trustee appointed pursuant thereto.

“Existing Agreement” means the Intercreditor Agreement (2019-1), dated as of December 9, 2019, among the Class A Trustee, the Class B Trustee, the Class C Trustee and Wilmington Trust, National Association, not in its individual capacity except as expressly set forth therein but solely as Subordination Agent.

“Series C(R) Equipment Notes” means the Series C(R) Equipment Notes issued pursuant to each Indenture by Sun Country and authenticated by the Loan Trustee thereunder, and any such Equipment Notes issued in exchange therefor or replacement thereof pursuant to the terms of such Indenture.

(d)Section 1.1 of the Existing Agreement shall be amended further by amending and restating in their entirety the below definitions to read as follows:

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“Class C Adjusted Interest” means, as of any Current Distribution Date:

(a) prior to the Class C(R) Certificate Issuance Date, the “Class C Adjusted Interest” (as defined in the Existing Agreement) and (b) on or after the Class C(R) Certificate Issuance Date, (I) any interest described in clause (II) of this definition accruing prior to theimmediately preceding Distribution Date which remains unpaid and (II) interest at the Stated Interest Rate for the Class C Certificates (A) for the number of days during the period commencing on, and including, the immediately preceding Distribution Date (or, if the Current Distribution Date is the first Distribution Date with respect to the Class C Certificates, the Class C(R) Certificate Issuance Date) and ending on, but excluding, the Current Distribution Date, on the Preferred C Pool Balance on such Current Distribution Date and (B) on the principal amount calculated pursuant to clauses (B)(i), (ii), (iii) and

(iv) of the definition of Preferred C Pool Balance for each Series C Equipment Note with respect to which a disposition, distribution, sale or Deemed Disposition Event has occurred since the immediately preceding Distribution Date (but only if no such event has previously occurred with respect to such Series C Equipment Note), for each day during the period, for each such Series C Equipment Note, commencing on, and including, the immediately preceding Distribution Date (or, if the Current Distribution Date is the first Distribution Date with respect to the Class C Certificates, the Class C(R) Certificate Issuance Date) and ending on, but excluding the date of disposition, distribution, sale or Deemed Disposition Event with respect to such Series C Equipment Note, Aircraft or Collateral, as the case may be.

“Class C Certificateholder” means (i) prior to the Class C(R) Certificate Issuance Date, the Class C Certificateholder (as defined in the Existing Agreement) and

(ii) on or after the Class C(R) Certificate Issuance Date, the Class C(R) Certificateholder.

“Class C Certificates” means (i) prior to the Class C(R) Certificate Issuance Date, the Class C Certificates (as defined in the Existing Agreement) and (ii) on or after the Class C(R) Certificate Issuance Date, the Class C(R) Certificates.

“Class C Trust” means (i) prior to the Class C(R) Certificate Issuance Date, the Class C Trust (as defined in the Existing Agreement) and (ii) on or after the Class C(R) Certificate Issuance Date, the Class C(R) Trust.

“Class C Trust Agreement” means (i) prior to the Class C(R) Certificate Issuance Date, the Class C Trust Agreement (as defined in the Existing Agreement) and

(ii) on or after the Class C(R) Certificate Issuance Date, the Class C(R) Trust Agreement.

“Class C Trustee” means (i) prior to the Class C(R) Certificate Issuance Date, the Class C Trustee (as defined in the Existing Agreement) and (ii) on or after the Class C(R) Certificate Issuance Date, the Class C(R) Trustee.

“Final Legal Distribution Date” means (i) with respect to the Class A Certificates, June 15, 2029, (ii) with respect to the Class B Certificates, June 15, 2027 and

(iii) with respect to the Class C(R) Certificates, June 15, 2029.

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“Operative Agreements” means this Agreement, the Trust Agreements, the Certificate Purchase Agreement, the Class C(R) Certificate Purchase Agreement, the Financing Agreements, the Equipment Notes and the Certificates, together with all exhibits and schedules included with any of the foregoing.

“Rating Agency” means, at any time, any nationally recognized rating agency which shall have been requested to rate the Certificates and which shall then be rating the Certificates. As of the Class C(R) Certificate Issuance Date, the Rating Agency is Kroll Bond Rating Agency, LLC.

“Regular Distribution Dates” means each June 15 and December 15, commencing on (i) in the case of Class A Certificates, June 15, 2020, (ii) in the case of Class B Certificates, June 15, 2020 and (iii) in the case of Class C(R) Certificates, June 15, 2025; provided, however, that, if any such day shall not be a Business Day, the related distribution shall be made on the next succeeding Business Day without distribution of interest for such additional period.

“Series C Equipment Notes” means (i) prior to the Class C(R) Certificate Issuance Date, the Series C Equipment Notes (as defined in the Existing Agreement) and

(ii) on or after the Class C(R) Certificate Issuance Date, the Series C(R) Equipment Notes.

“Stated Interest Rate” means (i) with respect to the Class A Certificates, a per annum rate for any day equivalent to the weighted average interest rate (determined for such purpose based on the applicable Debt Rate as defined in each Indenture) of the Series A Equipment Notes held by the Class A Trust on such day, (ii) with respect to the Class B Certificates, a per annum rate for any day equivalent to the weighted average interest rate (determined for such purpose based on the applicable Debt Rate as defined in each Indenture) of the Series B Equipment Notes held by the Class B Trust on such day and (iii) with respect to the Class C(R) Certificates [ ]% per annum.

Section 3. No Other Amendments. Except as expressly provided in this Amendment, all of the terms and conditions of the Existing Agreement shall remain in full force and effect and are hereby ratified and confirmed.

Section 4. Miscellaneous. The terms of this Amendment shall be binding upon, inure to the benefit of, and be enforceable by, the parties hereto and their respective successors and assigns. The terms of this Amendment shall in all respects be governed by, and construed in accordance with, the law of the State of New York, including all matters of construction, validity and performance. This Amendment may be executed in any number of counterparts (including by electronic transmission (including.pdf file,.jpeg file, Adobe Sign, or DocuSign)), each of which so executed shall be deemed to be an original, but all of such counterparts shall together constitute but one and the same instrument. Delivery of an executed counterpart signature page of this Amendment by e-mail or any such other electronic transmission shall be effective as delivery of a manually executed counterpart of this Amendment and shall have the same legal validity and enforceability as a manually executed signature to the fullest extent permitted by applicable law. Any electronically signed document delivered via e-mail from a person purporting to be an authorized officer shall be considered signed or executed by such authorized officer on behalf of the applicable person and will be binding on all parties hereto to the same

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extent as if it were manually executed. The words “execution”, “execute”, “signed”, “signature”, and words of like import in or related to any document to be signed in connection with this Amendment shall be deemed to include electronic signatures, the electronic matching of assignment terms and contract formations on electronic platforms, or the keeping of records in electronic form, each of which shall be of the same legal effect, validity or enforceability as a manually executed signature or the use of a paper-based recordkeeping system, as the case may be, to the extent and as provided for in any applicable law, including the Federal Electronic Signatures in Global and National Commerce Act, the New York State Electronic Signatures and Records Act, or any other similar state laws based on the Uniform Electronic Transactions Act.

[signature pages follow]

IN WITNESS WHEREOF, the parties hereto have caused this Amendment to Intercreditor Agreement (2019-1C(R)) to be duly executed as of the day and year first above written.

WILMINGTON TRUST, NATIONAL ASSOCIATION, not in individual capacity but solely as Trustee for the Class A Trust, Class B Trust and the Class(R) Trust
By:	/s/ Chad May
Name:	Chad May
Title:	Senior Vice President
WILMINGTON TRUST, NATIONAL ASSOCIATION, not in individual capacity except as expressly set forth herein but solely as Subordination Agent
By:	/s/ Chad May
Name:	Chad May
Title:	Senior Vice President
By:	/s/ Jude Bricker
Name:	Jude Bricker
Title:	CEO

[Signature Page - Amendment to Intercreditor Agreement (2019-1C(R))]

Document

Exhibit 19.1

SUN COUNTRY AIRLINES HOLDINGS, INC. SECURITIES TRADING POLICY

March 5, 2021

To Directors, Officers and Employees of Sun Country Airlines Holdings, Inc. and its subsidiaries (collectively, the “Company”):

Attached is the Securities Trading Policy (the “Policy”) for directors, officers and employees of the Company, which has been adopted by the Board of Directors. Please read this Policy very carefully.

All directors, officers and employees who are subject to the pre-trading procedures described in VI of this Policy will be asked to acknowledge their receipt and acknowledgement of this policy.

The Policy

The Company’s common stock will be publicly traded following the Company’s initial public offering. The purchase or sale of, or other transactions in, publicly traded securities of the Company while you are aware of material nonpublic information, or the disclosure of material nonpublic information to others who then trade in publicly traded securities of the Company, is prohibited by the federal securities laws.

The federal securities laws impose liability not only on persons who trade, or tip inside information to others who trade, but on companies and other controlling persons who fail to take reasonable steps to prevent insider trading by company employees. As a result, if we do not take active steps to adopt preventive policies and procedures covering securities trades by personnel (including service providers) of the Company, the consequences could be severe.

We are adopting this Policy to avoid even the appearance of improper conduct by anyone employed by or associated with the Company (not just so-called “insiders”). We have all worked hard over the years to establish our reputation for integrity and ethical conduct. We cannot afford to have that reputation damaged.

In addition to the limitations on trading contained in this Policy, directors and officers of the Company and beneficial owners of more than 10% of the Company’s common stock are also subject to certain reporting requirements under Section 16 of the Securities Exchange Act of 1934 (the “Exchange Act”). In addition, any person who beneficially owns 5% or more of the Company’s common stock is subject to certain reporting requirements under Section 13(d) of the Exchange Act. You should contact the Company’s Legal Department if you need further information with respect to these reporting obligations.

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The Consequences

The Securities and Exchange Commission (the “SEC”) and the stock exchanges are extremely effective in detecting insider trading. The SEC and the Department of Justice have prosecuted cases involving trading or tipping by employees at all levels of a business, trading or tipping by family members and friends, trading involving offshore accounts and trading involving only a small amount of stock. The consequences of insider trading violations can be severe:

For individuals who trade on inside information (or tip information to others):

•civil penalties of up to three times the profit gained or loss avoided;

•criminal fines (no matter how small the profit); and

•jail terms.

For a company (as well as possibly any supervisory person) that fails to take appropriate steps to prevent illegal trading, civil and criminal penalties.

Moreover, if any employee violates this Policy, Company-imposed sanctions, including dismissal for misconduct or cause, could result. Needless to say, any of the above consequences, even an investigation by the SEC that does not result in prosecution, can tarnish the reputation of the Company, its management and the person involved, and irreparably damage a career.

If you have any questions, please feel free to contact the Company’s Legal Department.

Once again, please read this material very carefully.

Yours truly,

Jude Bricker

Chief Executive Officer

Enclosure

SUN COUNTRY AIRLINES HOLDINGS, INC. SECURITIES TRADING POLICY

I.Purpose

To describe the standards concerning the handling of non-public information relating to Sun Country Airlines Holdings, Inc. and its subsidiaries (the “Company”) and the buying and selling of securities of the Company.

II.Persons Affected and Prohibited Transactions

The general prohibitions of this Policy apply to all directors, officers and employees1 of the Company, while the restrictions set forth in Part VI apply only to directors, executive officers2 and certain designated officers and employees. If you are unsure whether you are subject to the restrictions set forth in VI, please contact the Company’s Legal Department.

The same restrictions described in this Policy also apply to your spouse, minor children and anyone else living in your household, partnerships in which you are a general partner, trusts of which you are a trustee, estates of which you are an executor and investment funds or other similar vehicles with which you are affiliated (collectively “Related Parties”). You will be responsible for compliance with this Policy by your Related Parties.

For purposes of this Policy, references to “trading” or to “transactions in securities of the Company” include purchases or sales of Company stock, bonds, options, puts and calls, derivative securities based on securities of the Company, gifts of Company securities, loans of Company securities, hedging transactions involving or referencing Company securities, contributions of Company securities to a trust, sales of Company stock acquired upon the exercise of stock options, broker-assisted cashless exercises of stock options, market sales to raise cash to fund the exercise of stock options and trades in Company stock made under an employee benefit plan, such as a 401(k) plan.

III.Policy Statement

If you possess material nonpublic information (as further discussed below) relating to the Company, neither you nor any Related Party:

•may effect transactions in securities of the Company (other than pursuant to a pre-arranged trading plan that complies with Rule 10b5-1 (“Rule 10b5-1”) under the Securities Exchange Act of 1934, as amended (the

1    Employees for purposes of this Policy are all non-operational headquarters employees.

2    Executive officers for purposes of this Policy are all executive officers of the Company identified in its public filings and any other officer of the Company or any subsidiary that is subject to Section 16(b) of the Securities Exchange Act of 1934.

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“Exchange Act”), as described in Part VII below) or engage in any other action that take advantage of that information;

•may pass that information on to any person outside the Company, except as permitted under applicable Company policies and procedures;

•suggest or otherwise recommend that any person effect a transaction in securities of the Company or engage in any other action that takes advantage of that information; or

•assist anyone engaged in any of the foregoing activities.

This Policy will continue to apply after termination of employment to the extent that you are in possession of material nonpublic information at the time of termination. In such case, no transaction in securities of the Company may take place until the information becomes public or ceases to be material.

This Policy also applies to information, obtained in the course of employment with, or by serving as a director of, the Company, relating to any other company, including:

•our customers, clients or suppliers,

•any entity with which we may be negotiating a major transaction or business combination, or

•any entity as to which we have an indirect or direct control relationship or a designee on the board of directors.

Neither you nor any Related Party may effect transactions in the securities of any such other company while in possession of material nonpublic information concerning such company that was obtained in the course of employment with the Company.

Transactions that may be necessary or justifiable for independent reasons (such as the need to raise money for an emergency expenditure) are no exception. Even the appearance of an improper transaction must be avoided to preserve our reputation for adhering to the highest standards of conduct.

Material Information. “Material information” is any information that a reasonable investor would consider important in a decision to effect a transaction in securities of the Company. In short, any information that could reasonably affect the price of such securities. Either positive or negative information may be material. Common examples of information that will frequently be regarded as material are:

•projections of future earnings or losses, or other guidance concerning earnings;

•the fact that earnings are inconsistent with consensus expectations;

•a pending or proposed merger, joint venture, acquisition or tender offer;

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•a significant sale of assets or the disposition of a subsidiary or business unit;

•changes in dividend policies or the declaration of a stock split or the offering of additional securities;

•changes in senior management or other key employees;

•significant new products or services;

•significant legal or regulatory exposure due to a pending or threatened lawsuit or investigation;

•impending bankruptcy or other financial liquidity problems;

•a material cyber incident that has not been disclosed;

•changes in legislation affecting our business; and

•the gain or loss of a substantial customer, client or supplier.

20-20 Hindsight. Remember, if your transaction in securities of the Company becomes the subject of scrutiny, it will be viewed after-the-fact with the benefit of hindsight. As a result, before engaging in any transaction you should carefully consider how regulators and others might view your transaction in hindsight.

Tipping Information to Others. Whether the information is proprietary information about the Company or other information that could have an impact on the price of the Company’s securities, you must not pass the information on to others. Penalties will apply whether or not you derive, or even intend to derive, any profit or other benefit from another’s actions.

When Information is Public. You may not trade on the basis of material information that has not been broadly disclosed to the marketplace, such as through a press release or a filing with the Securities and Exchange Commission (the “SEC”), and the marketplace has had time to absorb the information. As a general rule, information should not be considered fully absorbed by the marketplace until the end of the first business day after the information is released. Thus, if information is released on a Monday, trading should not take place until Wednesday. However, if the information in question is contained in a regular quarterly earnings release and the release is issued prior to the opening of the market on a given day, trading may take place on the next business day following the day of release.

Transactions under Company Plans. Although this Policy does not generally apply to the exercise of employee stock options (other than cashless exercises as described below), it does apply to the sale of common stock received upon exercise. This Policy applies however to the sale as part of a broker-assisted cashless exercise of a stock option and the market sale for the purpose of raising cash to fund the exercise of an option or to pay taxes.

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Confidentiality Obligations. The restrictions set forth in this Policy are designed to avoid misuse of material nonpublic information in violation of the securities laws. These restrictions are in addition to, and in no way alter, the general obligations that each director, officer and employee of the Company has to maintain the confidentiality of all confidential or proprietary information concerning the Company and its business, as well as any other confidential information, that may be learned in the course of service or employment with the Company. No such information is to be disclosed to any other person in the Company, unless that person has a clear need to know that information, and no such information may be disclosed to any third parties, except as required or otherwise contemplated by your function or position.

You should take precautions to prevent the unauthorized disclosure or other misuse of such information by maintaining files securely, avoiding discussions of such information in public and taking extra care when distributing such information electronically.

IV.Additional Prohibited Transactions

Because we believe it is improper and inappropriate for any person to engage in short-term or speculative transactions involving the Company’s securities, directors, officers and employees of the Company, and their Related Parties, are prohibited from engaging in any of the following activities with respect to securities of the Company:

1.Purchases of securities of the Company on margin. Although you may pledge Company securities as security for margin accounts, you are responsible for ensuring that foreclosure on any such account would not violate this Policy and you should be aware that sales of such securities could have securities law implications for you.

2.Short sales (i.e., selling stock you do not own and borrowing the shares to make delivery). The SEC effectively prohibits directors and officers from selling Company securities short. This Policy is simply expanding this prohibition to cover all employees.

3.Buying or selling puts, calls, options or other derivatives in respect of securities of the Company. This prohibition extends to any instrument whose value is derived from the value of any securities (e.g., common stock) of the Company.

Directors, executive officers and other employees, and their designees, are prohibited from purchasing any financial instruments (including prepaid variable forward contracts, equity swaps, collars and exchange funds) or otherwise engaging in transactions that are designed to or have the effect of hedging or offsetting any decrease in the market value of the Company’s equity securities.

Although the Company is not prohibiting standing or limit orders, you should use extreme caution if you engage in standing or limit orders (other than as established in connection with a Rule 10b5-1 plan as described in Part VII below) since you might

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become aware of material nonpublic information after establishing an order. This could lead to inadvertent trading while in possession of material non-public information.

V.Blackout Periods

The Company’s announcement of annual and quarterly financial results has the potential to have a material impact on the market for the Company’s securities. Therefore, in order to avoid any appearance that its directors, officers, employees and other insiders are trading while aware of material nonpublic information, all directors, executive officers and certain designated employees will be subject to quarterly blackouts on trading.

The Company has established the following “blackout periods” in relation to the publication of its annual and quarterly results: (a) the period commencing two calendar weeks prior to the end of its fiscal year and ending on and including the first trading day after public announcement of the Company’s annual financial results; (b) the period commencing two calendar weeks prior to the end of each of its fiscal quarters and ending on and including the first trading day after public announcement of the Company’s financial results for such quarter; and (c) for directors and executive officers, to the extent and during the periods as the Legal Department may direct, including as required by Section 306 of the Sarbanes-Oxley Act of 2002 or its implementing regulations.

During these blackout periods, the following persons and their Related Parties are

prohibited from effecting transactions in securities of the Company:

•directors and their secretaries and other assistants;

•executive officers, any other officer who has an obligation to file reports under Section 16 of the Exchange Act3, and their secretaries and other assistants; and

•any other person designated by the Legal Department.

You should be aware that the blackout periods described above may be modified by the Company at any time. In addition, the Company may from time to time determine that effecting transactions in securities of the Company is inappropriate at a time that is outside the blackout periods and, accordingly, may notify directors, executive officers and certain designated employees of additional closed periods at any time. For example, a short blackout period may be imposed shortly before issuance of interim earnings guidance. Directors, executive officers and certain designated employees will receive notice of any modification by the Company of the closed period policy or of any additional prohibition on trading during a non-blackout period. Directors, executive officers and certain designated employees subject to the blackout period restrictions who terminate their relationship or employment with the Company during a blackout period will remain subject to the restrictions until the end of such period (including as it relates to broker-assisted cashless exercise of a stock option and the market sale for the purpose of raising cash to fund the exercise of an option or to pay taxes).

3 See Footnote 1.

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The prohibition described in this Part V shall not apply to gifts of Company securities and contributions of Company securities to a trust so long as the requirements of Part VI below are complied with. We do, however, recommend that gifts and contributions be made, whenever possible, outside of a blackout period. The prohibition shall also not apply with respect to a public offering of Company securities specifically authorized by the Company’s board of directors or duly authorized board committee. The Legal Department may, on a case-by-case basis, authorize effecting a transaction in Company securities during a blackout period if the person who wishes to effect such a transaction (i) has, at least two business days prior to the anticipated transaction date, notified the Company in writing of the circumstances and the amount and nature of the proposed transaction and (ii) has certified to the Company that he or she is not in possession of material nonpublic information concerning the Company.

See Part VII below for the principles applicable to transactions under Rule 10b5-1

plans.

VI.Pre-Trading Consultation with the Legal Department

To provide assistance in preventing inadvertent violations of the law (which could result for example, from failure by directors and officers subject to reporting obligations under Section 16 of the Exchange Act) and avoiding even the appearance of an improper transaction (which could result, for example, where an officer engages in a trade while unaware of a pending major development), we are implementing the following procedure:

Prior to trading, the Company’s Legal Department should be notified of all transactions in securities of the Company by the following persons and their Related Parties:

•directors and their secretaries and other assistants;

•executive officers, any other officer who has an obligation to file reports under Section 16 of the Exchange Act4, and their secretaries and other assistants; and

•any other person designated by the Legal Department.

Persons subject to these restrictions should contact the Legal Department at least two business days (or such shorter period as the Legal Department may determine) in advance of any transaction in the Company’s securities. If a transaction for which consultation has been completed is not effected (i.e., the trade is not placed) within three business days of such consultation, the Legal Department should again be consulted prior to the transaction.

To the extent that a material event or development affecting the Company remains nonpublic, persons subject to this Part VI will be advised against transacting in securities of the Company. Such persons may not be informed of the reason why they are advised

4 See Footnote 1.

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against trading. Any person that is made aware of the reason for an event-specific warning against trading should in no event disclose the reason for the warning to third parties and should avoid disclosing the existence of the warning, if possible. Caution should be exercised when telling a broker or other person who suggested a trade that the trade should not be effected at the time.

Note that the procedures described in this Part VI may delay the disposition of any security after it is purchased.

See Part VII below for the principles applicable to transactions under Rule 10b5-1

plans.

VII.10b5-1 Plans.

The SEC has adopted a safe harbor rule, Rule 10b5-1, which provides a defense against insider trading liability for trades that are effected pursuant to a pre-arranged trading plan that meets specified conditions. The trading plan must be properly documented and all of the procedural conditions of the Rule must be satisfied to avoid liability.

Rule 10b5-1 plans allow transactions for the account of an insider to occur during blackout periods or while the insider has material nonpublic information provided the insider has previously given instructions or other control to effect pre-planned transactions in securities of the Company to a third party. The insider must establish the plan at a time when he or she is not in possession of material nonpublic information and the insider may not exercise any subsequent influence over how, when or whether to effect transactions. In addition to other specified conditions, a Rule 10b5-1 plan would specify in writing in advance the amount and price of the securities to be sold and the date for the sale (or a formula for determining the amount, price and date) or would otherwise not permit the insider to exercise any subsequent influence over how, when or whether to effect the sales. After adopting a valid Rule 10b5-1 plan, the insider will have an affirmative defense that a sale under the plan was not made “on the basis of” material nonpublic information.

The Company will treat the creation, modification or termination of a pre-planned trading program or arrangement established to meet the requirements of Rule 10b5-1 as a transaction subject to the blackout period rules set forth in Part V of this Policy. Transactions effected pursuant to a properly established Rule 10b5-1 plan however will not be subject to the blackout periods under Part V of this Policy.

The Company will treat the creation, modification or termination of a pre-planned trading program or arrangement established to meet the requirements of Rule 10b5-1 as a transaction subject to pre-trading consultation under Part VI of this Policy at the time the plan is established, modified or terminated. In order to enter into a Rule 10b5-1 plan the Legal Department must be consulted and transactions effected under a Rule 10b5-1 plan should also be made in accordance with Rule 144 and must be reported on a Form 4 under Section 16 of the Exchange Act where applicable.

8

VIII.Assistance

Any person who has any questions about this Policy or about specific transactions may contact the Company’s Legal Department. Remember, however, that the ultimate responsibility for adhering to this Policy and avoiding improper transactions rests with you. In this regard, it is imperative that you use your best judgment and to ask before acting if you are unsure.

Document

Exhibit 23.1

Consent of Independent Registered Public Accounting Firm

We consent to the incorporation by reference in the registration statements (No. 333-254371) on Form S-8 and (No. 333-269023) on Form S-3 of our report dated February 12, 2025, with respect to the consolidated financial statements of Sun Country Airlines Holdings, Inc. and subsidiaries and the effectiveness of internal control over financial reporting.

/s/ KPMG LLP

Minneapolis, Minnesota

February 12, 2025

Document

Exhibit 31.1

CERTIFICATION OF CHIEF EXECUTIVE OFFICER

PURSUANT TO RULE 13a-14(a) OR 15d-14(a)

OF THE SECURITIES EXCHANGE ACT OF 1934,

AS ADOPTED PURSUANT TO SECTION 302 OF THE SARBANES-OXLEY ACT OF 2002

I, Jude Bricker, certify that:

1.I have reviewed this annual report on Form 10-K of Sun Country Airlines Holdings, Inc. ("Sun Country") for the year ended December 31, 2024;

2.Based on my knowledge, this report does not contain any untrue statement of a material fact or omit to state a material fact necessary to make the statements made, in light of the circumstances under which such statements were made, not misleading with respect to the period covered by this report;

3.Based on my knowledge, the financial statements, and other financial information included in this report, fairly present in all material respects the financial condition, results of operations and cash flows of Sun Country as of, and for, the periods presented in this report;

4.Sun Country's other certifying officer and I are responsible for establishing and maintaining disclosure controls and procedures (as defined in Exchange Act Rules 13a-15(e) and 15d-15(e)) and internal control over financial reporting (as defined in Exchange Act Rules 13a-15(f) and 15d-15(f)) for Sun Country and have:

(a)Designed such disclosure controls and procedures, or caused such disclosure controls and procedures to be designed under our supervision, to ensure that material information relating to Sun Country, including its consolidated subsidiaries, is made known to us by others within those entities, particularly during the period in which this report is being prepared;

(b)Designed such internal control over financial reporting, or caused such internal control over financial reporting to be designed under our supervision, to provide reasonable assurance regarding the reliability of financial reporting and the preparation of financial statements for external purposes in accordance with generally accepted accounting principles;

(c)Evaluated the effectiveness of Sun Country’s disclosure controls and procedures and presented in this report our conclusions about the effectiveness of the disclosure controls and procedures, as of the end of the period covered by this report based on such evaluation; and

(d)Disclosed in this report any change in Sun Country's internal control over financial reporting that occurred during Sun Country's most recent fiscal quarter that has materially affected, or is reasonably likely to materially affect, Sun Country's internal control over financial reporting; and

5.Sun Country's other certifying officer and I have disclosed, based on our most recent evaluation of internal control over financial reporting, to Sun Country's auditors and the Audit Committee of Sun Country's Board of Directors (or persons performing the equivalent functions):

(a)All significant deficiencies and material weaknesses in the design or operation of internal control over financial reporting which are reasonably likely to adversely affect Sun Country's ability to record, process, summarize and report financial information; and

(b)Any fraud, whether or not material, that involves management or other employees who have a significant role in Sun Country's internal control over financial reporting.

February 12, 2025
	/s/ Jude Bricker
	Jude Bricker
	Chief Executive Officer

Document

Exhibit 31.2

CERTIFICATION OF CHIEF FINANCIAL OFFICER

PURSUANT TO RULE 13a-14(a) OR 15d-14(a)

OF THE SECURITIES EXCHANGE ACT OF 1934,

AS ADOPTED PURSUANT TO SECTION 302 OF THE SARBANES-OXLEY ACT OF 2002

I, Dave Davis, certify that:

1.I have reviewed this annual report on Form 10-K of Sun Country Airlines Holdings, Inc. ("Sun Country") for the year ended December 31, 2024;

2.Based on my knowledge, this report does not contain any untrue statement of a material fact or omit to state a material fact necessary to make the statements made, in light of the circumstances under which such statements were made, not misleading with respect to the period covered by this report;

3.Based on my knowledge, the financial statements, and other financial information included in this report, fairly present in all material respects the financial condition, results of operations and cash flows of Sun Country as of, and for, the periods presented in this report;

4.Sun Country's other certifying officer and I are responsible for establishing and maintaining disclosure controls and procedures (as defined in Exchange Act Rules 13a-15(e) and 15d-15(e)) and internal control over financial reporting (as defined in Exchange Act Rules 13a-15(f) and 15d-15(f)) for Sun Country and have:

(a)Designed such disclosure controls and procedures, or caused such disclosure controls and procedures to be designed under our supervision, to ensure that material information relating to Sun Country, including its consolidated subsidiaries, is made known to us by others within those entities, particularly during the period in which this report is being prepared;

(b)Designed such internal control over financial reporting, or caused such internal control over financial reporting to be designed under our supervision, to provide reasonable assurance regarding the reliability of financial reporting and the preparation of financial statements for external purposes in accordance with generally accepted accounting principles;

(c)Evaluated the effectiveness of Sun Country’s disclosure controls and procedures and presented in this report our conclusions about the effectiveness of the disclosure controls and procedures, as of the end of the period covered by this report based on such evaluation; and

(d)Disclosed in this report any change in Sun Country's internal control over financial reporting that occurred during Sun Country's most recent fiscal quarter that has materially affected, or is reasonably likely to materially affect, Sun Country's internal control over financial reporting; and

5.Sun Country's other certifying officer and I have disclosed, based on our most recent evaluation of internal control over financial reporting, to Sun Country's auditors and the Audit Committee of Sun Country's Board of Directors (or persons performing the equivalent functions):

(a)All significant deficiencies and material weaknesses in the design or operation of internal control over financial reporting which are reasonably likely to adversely affect Sun Country's ability to record, process, summarize and report financial information; and

(b)Any fraud, whether or not material, that involves management or other employees who have a significant role in Sun Country's internal control over financial reporting.

February 12, 2025
	/s/ Dave Davis
	Dave Davis
	President and Chief Financial Officer

Document

Exhibit 32

CERTIFICATION PURSUANT TO

18 U.S.C. SECTION 1350,

AS ADOPTED PURSUANT TO

SECTION 906 OF THE SARBANES-OXLEY ACT OF 2002

February 12, 2025

The certifications set forth below are hereby submitted to the Securities and Exchange Commission pursuant to, and solely for the purpose of complying with, Section 1350 of Chapter 63 of Title 18 of the United States Code in connection with the filing on the date hereof with the Securities and Exchange Commission of the annual report on Form 10-K of Sun Country Airlines Holdings, Inc. ("Sun Country") for the annual period ended December 31, 2024 (the "Report").

Each of the undersigned, the Chief Executive Officer and the President and Chief Financial Officer, respectively, of Sun Country, hereby certifies that, as of the end of the period covered by the Report:

1.such Report fully complies with the requirements of Section 13(a) of the Securities Exchange Act of 1934; and

2.the information contained in the Report fairly presents, in all material respects, the financial condition and results of operations of Sun Country.

/s/ Jude Bricker
Jude Bricker
Chief Executive Officer
/s/ Dave Davis
Dave Davis
President and Chief Financial Officer