Condensed Consolidated Statement of Comprehensive Income (Loss) - USD ($) shares in Millions, $ in Millions	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021
OPERATING REVENUE:
Total operating revenues	$ 4,694	$ 2,052
OPERATING EXPENSES, NET:
Salaries, wages, and benefits	2,229	1,571
Payroll support and voluntary Employee programs, net	0	(1,448)
Fuel and oil	1,004	469
Maintenance materials and repairs	211	173
Landing fees and airport rentals	346	313
Depreciation and amortization	324	312
Other operating expenses	731	463
Total operating expenses, net	4,845	1,853
OPERATING INCOME (LOSS)	(151)	199
OTHER EXPENSES (INCOME):
Interest expense	93	114
Capitalized interest	(9)	(11)
Interest income	(3)	(2)
Other (gains) losses, net	144	(48)
Total other expenses (income)	225	53
INCOME (LOSS) BEFORE INCOME TAXES	(376)	146
PROVISION (BENEFIT) FOR INCOME TAXES	(98)	30
NET INCOME (LOSS)	$ (278)	$ 116
NET INCOME (LOSS) PER SHARE, BASIC (in USD per share)	$ (0.47)	$ 0.20
NET INCOME (LOSS) PER SHARE, DILUTED (in USD per share)	$ (0.47)	$ 0.19
COMPREHENSIVE INCOME	$ 225	$ 180
WEIGHTED AVERAGE SHARES OUTSTANDING
Basic (in shares)	592	591
Diluted (in shares)	592	609
Passenger
OPERATING REVENUE:
Total operating revenues	$ 4,135	$ 1,712
Freight
OPERATING REVENUE:
Total operating revenues	42	43
Other
OPERATING REVENUE:
Total operating revenues	$ 517	$ 297