X0508 4 2025-01-23 0001743907 Sun Country Airlines Holdings, Inc. SNCY 0001277174 DAVIS DAVID M C/O SUN COUNTRY AIRLINES HOLDINGS, INC. 2005 CARGO ROAD MINNEAPOLIS MN 55450 1 1 President & CFO 1 Common Stock, par value $0.01 per share 2025-01-23 4 M 0 23867 5.30 A 56127 D Common Stock, par value $0.01 per share 2025-01-23 4 M 0 2678 5.30 A 58805 D Common Stock, par value $0.01 per share 2025-01-23 4 S 0 26545 16.9142 D 32260 D Common Stock, par value $0.01 per share 2025-01-24 4 M 0 32540 5.30 A 64800 D Common Stock, par value $0.01 per share 2025-01-24 4 M 0 2996 5.30 A 67796 D Common Stock, par value $0.01 per share 2025-01-24 4 S 0 35536 16.9238 D 32260 D Employee Stock Option (Right to Buy) 5.30 2025-01-23 4 M 0 23867 0 D 2029-04-17 Common Stock 23867 448322 D Employee Stock Option (Right to Buy) 5.30 2025-01-23 4 M 0 2678 0 D 2029-04-17 Common Stock 2678 445644 D Employee Stock Option (Right to Buy) 5.30 2025-01-24 4 M 0 32540 0 D 2029-04-17 Common Stock 32540 413104 D Employee Stock Option (Right to Buy) 5.30 2025-01-24 4 M 0 2996 0 D 2029-04-17 Common Stock 2996 410108 D The sales reported in this Form 4 were effected pursuant to a Rule 10b5-1 trading plan. The 10b5-1 trading plan was adopted on September 4, 2024. The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $16.90 to $17.00, inclusive. The reporting person undertakes to provide to Sun Country Airlines Holdings, Inc. ("Sun Country"), any security holder of Sun Country, or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price within the ranges set forth in footnote (2) to this Form 4. The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $16.90 to $17.00, inclusive. The reporting person undertakes to provide to Sun Country, any security holder of Sun Country, or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price within the ranges set forth in footnote (3) to this Form 4. Grants may have a graded vesting schedule. Date Exercisable will vary for each vesting tranche. /s/ Rose Neale, attorney-in-fact for David M. Davis 2025-01-27