0001743907 2025-01-01 2025-12-31 0001743907 2025-06-30 0001743907 2025-12-31 iso4217:USD shares 0001743907 FY true 10-K/A true 2025-12-31 --12-31 2025 false 001-40217 Sun Country Airlines Holdings, Inc. DE 82-4092570 2005 Cargo Road Minneapolis MN 55450 651 681-3900 Common Stock, par value $0.01 per share SNCY NASDAQ No No Yes Yes Accelerated Filer false false true false false 624000000 53223302 Explanatory Note This Amendment No. 1 to the Annual Report on Form 10-K (this “Amendment”) amends the Annual Report on Form 10-K for the year ended December 31, 2025 originally filed on February 12, 2026 (the “Original Form 10-K”) by Sun Country Airlines Holdings, Inc., a Delaware corporation (referred to herein as the “Company”, “we”, “our”, “us” or “Sun Country”). On January 11, 2026, Sun Country, entered into the Merger Agreement with Allegiant Travel Company, a Nevada corporation (“Allegiant”), under which Allegiant will acquire the Company (the “Merger”). Subject to the satisfaction or waiver of the remaining conditions to closing, Allegiant and Sun Country now expect the closing to occur as early as May 13, 2026 following shareholder approval at the special meetings. In this event, the Company will not hold a 2026 annual meeting of stockholders. Sun Country is filing this Amendment solely to present the information required by Part III of Form 10-K, as Sun Country will not file its definitive proxy statement within 120 days of the end of its fiscal year ended December 31, 2025. Except as described above, no other changes have been made to the Original Form 10-K, and this Amendment does not modify, amend or update in any way any of the financial or other information contained in the Original Form 10-K. This Amendment does not reflect events that may have occurred subsequent to the filing of the Original Form 10-K. false true The Compensation and Human Resources Committee approves all equity grants for executive officers. Annual equity grants are typically approved during the first quarter of each fiscal year. Outside of the annual grant cycle, we may make restricted stock unit awards in connection with a new hire package, retention grant or other <div style="white-space: nowrap; letter-spacing: 0px; top: 0px;display:inline;">off-cycle</div> award. The Compensation and Human Resources Committee has delegated authority to the CEO and CFO to approve grants to employees below the officer level, which grants are approved on a quarterly basis. To determine the number of RSUs and PSUs to be granted, each employee’s applicable target grant date value is divided by the closing price of a share of our common stock on the grant date. The Compensation and Human Resources Committee has not granted stock options or other equity awards with a similar strike price or floor price feature since 2021. If stock options were to be granted in the future, the Company would <div style="-sec-ix-hidden:hidden164737002;display:inline;">not grant</div> such options in anticipation of the release of material nonpublic information that is likely to result in changes to the price of our common stock.