X0306 4 2023-01-04 0001743907 Sun Country Airlines Holdings, Inc. SNCY 0001850489 Whitney Grant C/O SUN COUNTRY AIRLINES HOLDINGS, INC. MINNEAPOLIS MN 55450 1 Chief Revenue Officer & EVP Common Stock, par value $0.01 per share 2023-01-04 4 S 0 136 16.2008 D 5701 D Common Stock, par value $0.01 per share 2023-01-06 4 A 0 10829 0 A 16530 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. /s/ Rose Neale, as attorney-in-fact for Grant Whitney 2023-01-06