X0206 3 2025-11-16 0 0001743907 Sun Country Airlines Holdings, Inc. SNCY 0002103680 Mangione Christopher Michael C/O SUN COUNTRY AIRLINES HOLDINGS, INC. 2005 CARGO ROAD MINNEAPOLIS MN 55450 1 Chief Acct. Off. & VP, Finance Common Stock, par value $0.01 per share 6871 D Common Stock, par value $0.01 per share 237 D Represents time-based restricted stock units previously granted to the reporting person, which are currently unvested. Grants have a graded vesting schedule. Vesting date varies for each grant. /s/ Rose Neale, as attorney-in-fact for Christopher Mangione 2026-01-06