X0508 4 2026-01-02 0001743907 Sun Country Airlines Holdings, Inc. SNCY 0002098878 Snow Colton Matthew C/O SUN COUNTRY AIRLINES HOLDINGS, INC. 2005 CARGO ROAD MINNEAPOLIS MN 55450 1 SVP, Chief Marketing Officer 0 Common Stock, par value $0.01 per share 2026-01-02 4 S 0 145 14.3688 D 22448 D Common Stock, par value $0.01 per share 2026-01-02 4 A 0 13803 0 A 36251 D Represents the number of shares sold by the reporting person to cover tax withholding obligations in connection with the vesting of restricted stock units. This sale is mandated to satisfy the tax withholding obligations which are funded by a "sell to cover" transaction and does not represent a discretionary trade by the reporting person. Represents the grant of restricted stock units made under the Sun Country Airlines Holdings, Inc. 2021 Omnibus Incentive Plan ("RSUs"). 1/3rd of these RSUs will vest and be settled on each of the first three anniversaries of the grant date, subject to continued employment. /s/ Rose Neale, as attorney-in-fact for Colton Snow 2026-01-05