Condensed Consolidated Statement of Comprehensive Loss - USD ($) shares in Millions, $ in Millions	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
OPERATING REVENUES:
Total operating revenues	$ 6,329	$ 5,706
OPERATING EXPENSES:
Salaries, wages, and benefits	2,940	2,478
Fuel and oil	1,531	1,547
Maintenance materials and repairs	361	240
Landing fees and airport rentals	464	408
Depreciation and amortization	408	365
Other operating expenses	1,018	952
Total operating expenses	6,722	5,990
OPERATING LOSS	(393)	(284)
OTHER EXPENSES (INCOME):
Interest expense	65	66
Capitalized interest	(7)	(6)
Interest income	(141)	(125)
Other gains, net	(12)	(14)
Total other income	(95)	(79)
LOSS BEFORE INCOME TAXES	(298)	(205)
BENEFIT FOR INCOME TAXES	(67)	(46)
NET LOSS	$ (231)	$ (159)
Net loss per share, basic (in USD per share)	$ (0.39)	$ (0.27)
Net loss per share, diluted (in USD per share)	$ (0.39)	$ (0.27)
COMPREHENSIVE LOSS	$ (212)	$ (306)
WEIGHTED AVERAGE SHARES OUTSTANDING
Basic (in shares)	597	594
Diluted (in shares)	597	594
Passenger
OPERATING REVENUES:
Total operating revenues	$ 5,712	$ 5,105
Freight
OPERATING REVENUES:
Total operating revenues	42	41
Other
OPERATING REVENUES:
Total operating revenues	$ 575	$ 560