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On September 22, 2025, Sun Country Airlines Holdings, Inc. (the “Company”) announced that the Board of Directors (the “Board”) appointed Wendy Schoppert to the Board, to be effective as of October 1, 2025. Ms. Schoppert will serve as a Class II director whose initial term will expire upon the Company’s 2026 annual meeting of stockholders. Ms. Schoppert has not been appointed as a member of any committee of the Board at this time.

Ms. Schoppert, age 58, is an experienced corporate board director for public and private companies in the retail, consumer products, financial services and health care industries. She currently serves as the Chair of the Board of Directors of The ODP Corporation/Home Depot (NASDAQ: ODP), a position she has held since 2020. Ms. Schoppert also serves on the Board of Directors of DaVita Inc. (NYSE: DVA), a position she has held since July 2023, and Fossil Group, Inc. (NASDAQ: FOSL), a position she has held since May 2025. Ms. Schoppert has previously served on the board of directors of The Hershey Company (NYSE: HSY), Bremer Financial Corporation, and Big Lots, Inc. (NYSE: BIG). Ms. Schoppert’s executive experience includes nine years at Sleep Number, a $1B publicly-held retailer and manufacturer, where she held the roles of EVP/Chief Financial Officer, SVP/Chief Information Officer, SVP of International, Head of Digital, and interim Chief Marketing Officer. Ms. Schoppert brings 12 years of experience in the airline industry, having held roles at America West Holdings Corporation, Northwest Airlines, Inc. and American Airlines, Inc. Ms. Schoppert holds a BA in Mathematics and Operations Research from Cornell University, and an MBA in Finance and General Management from Cornell University.

Ms. Schoppert will receive annual cash retainer fee(s) and an equity-based grant consisting of restricted stock units consistent with the Company’s compensation program for non-employee directors, as disclosed in the Company’s Definitive Proxy Statement filed with the SEC on April 25, 2025. All non-employee directors are also reimbursed for their reasonable out-of-pocket expenses incurred in attending Board and committee meetings.

There are no arrangements or understandings between Ms. Schoppert and any other persons pursuant to which Ms. Schoppert was selected as a director. There are no transactions, arrangements or relationships between the Company, on the one hand, and Ms. Schoppert, on the other hand, which would disclosure pursuant to Item 404(a) of Regulation S-K.

A copy of the Company’s press release announcing the appointment of Ms. Schoppert is filed as Exhibit 99.1 attached hereto and is incorporated by reference herein.

(d) Exhibits.

Pursuant to the requirements of the Securities Exchange Act of 1934, as amended, the registrant has duly caused this report to be signed on its behalf by the undersigned thereunto duly authorized.