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Consolidated Statements of Operations - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2023
Mar. 31, 2022
Revenues [Abstract]    
Total revenue $ 2,328 $ 1,736
OPERATING EXPENSES    
Aircraft fuel and related taxes 765 571
Salaries, wages and benefits 741 688
Landing fees and other rents 160 132
Depreciation and amortization 151 143
Aircraft rent 32 26
Sales and marketing 76 57
Maintenance, materials and repairs 176 152
Other operating expenses 357 334
Special items 112 0
Total operating expenses 2,570 2,103
OPERATING LOSS (242) (367)
OTHER INCOME (EXPENSE)    
Interest expense (46) (37)
Interest income 17 4
Gain on investments, net 3 2
Other income 2 0
Total other expense (24) (31)
LOSS BEFORE INCOME TAXES (266) (398)
Income tax benefit (74) (143)
NET LOSS $ (192) $ (255)
LOSS PER COMMON SHARE:    
Basic (in dollars per share) $ (0.58) $ (0.79)
Diluted (in dollars per share) $ (0.58) $ (0.79)
Retained Earnings    
OTHER INCOME (EXPENSE)    
NET LOSS $ (192) $ (255)
Passenger    
Revenues [Abstract]    
Total revenue 2,182 1,603
Other    
Revenues [Abstract]    
Total revenue $ 146 $ 133