Management Change/Compensation (Form 8-K)

Item 5.02 Departure of Directors or Certain Officers; Election of Directors; Appointment of Certain Officers; Compensatory Arrangements of Certain Officers

Appointment of Chief Financial Officer

On August 13, 2025, Sun Country Airlines Holdings, Inc. (the "Company"), announced that the Board of Directors of the Company (the "Board") has appointed D. Torque Zubeck as Senior Vice President and Chief Financial Officer, effective as of September 2, 2025, completing the search process previously undertaken by the Board to identify a permanent Chief Financial Officer. Mr. Zubeck will serve as the Company's principal financial and accounting officer as of such date. Bill Trousdale, who has been serving as interim Chief Financial Officer and principal financial and accounting officer, will step down from those positions effective as of September 1, 2025.

Mr. Zubeck, age 55, brings more than 30 years of finance experience to the Company, including more than 22 years of airline leadership roles. He served as Chief Financial Officer of Mesa Airlines from March 2021 to September 2023. Prior to his role at Mesa, Mr. Zubeck worked for 20 years at Alaska Airlines in finance, audit, cargo operations, and commercial partnerships. He led the successful integration of Virgin America into Alaska Airlines. His prior business experience also includes serving as Chief Financial Officer for two private companies in the Seattle region, including the Seattle Hospitality Group, and business consulting, financial planning, and non-profitmanagement. Mr. Zubeck earned his bachelor's degree at Stanford University and MBA at Eastern Michigan University.

There are no arrangements or understandings between Mr. Zubeck and any other person in connection with his appointment. Mr. Zubeck does not have any family relationships with any director or other executive officer of the Company, or any person nominated or chosen by the Company to become a director or executive officer, and there are no transactions in which Mr. Zubeck has an interest requiring disclosure under Item 404(a) of Regulation S-K

Employment Agreement with Mr. Zubeck

In connection with Mr. Zubeck's appointment as Senior Vice President and Chief Financial Officer, the Company and Mr. Zubeck entered into an employment letter agreement, to be effective September 2, 2025 (the "Zubeck Employment Letter"). Pursuant to the Zubeck Employment Letter, Mr. Zubeck will receive an annual base salary of $350,000 and will be eligible to earn an annual cash bonus in accordance with the annual bonus program generally applicable to the Company's other senior executives. Mr. Zubeck will receive a sign-onequity grant having a grant date value of $800,000 and consisting of time-based restricted stock units, vesting annually over a three year period. In addition, Mr. Zubeck will be eligible to receive annual equity-based compensation awards, as determined by the Board. Mr. Zubeck will be eligible to participate in the other compensation/benefit programs provided to senior executives of the Company generally.

In the event Mr. Zubeck's employment is terminated by the Company without "Cause" (as defined in the Zubeck Employment Letter), Mr. Zubeck will be entitled to receive continued base salary payments and continued healthcare coverage for the 12-monthperiod immediately following such termination of employment, subject to Mr. Zubeck's execution and non-revocationof a general release of claims and continued compliance with his applicable restrictive covenants.

The foregoing description of the Zubeck Employment Letter is qualified by reference to the full text of the Zubeck Employment Letter, a copy of which is attached hereto as Exhibit 10.1 and is hereby incorporated by reference in its entirety into this Item 5.02.