X0306 4 2022-05-20 0001743907 Sun Country Airlines Holdings, Inc. SNCY 0001855818 Davis Brian Edward C/O SUN COUNTRY AIRLINES HOLDINGS, INC. MINNEAPOLIS MN 55450 1 Chief Marketing Officer & SVP Common Stock, par value $0.01 per share 2022-05-20 4 M 0 1 5.30 A 1338 D Common Stock, par value $0.01 per share 2022-05-20 4 S 0 1 24.28 D 1337 D Common Stock, par value $0.01 per share 2022-05-23 4 M 0 27 5.30 A 1364 D Common Stock, par value $0.01 per share 2022-05-23 4 S 0 27 24.00 D 1337 D Employee Stock Option (Right to Buy) 5.30 2022-05-20 4 M 0 1 0 D 2028-11-07 Common Stock 1 64054 D Employee Stock Option (Right to Buy) 5.30 2022-05-23 4 M 0 27 0 D 2028-11-07 Common Stock 27 64027 D The sales reported in this Form 4 were effected pursuant to a Rule 10b5-1 trading plan. Vest in four annual installments, subject to continued service, beginning April 11, 2019. /s/ Eric Levenhagen, as attorney-in-fact for Brian Davis 2022-05-24