Condensed Consolidated Statement of Comprehensive Income - USD ($) shares in Millions, $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023
OPERATING REVENUES:
Total operating revenues	$ 6,870	$ 6,525	$ 20,553	$ 19,268
OPERATING EXPENSES:
Salaries, wages, and benefits	3,070	2,728	9,010	7,991
Fuel and oil	1,417	1,564	4,548	4,514
Maintenance materials and repairs	335	326	1,046	836
Landing fees and airport rentals	493	457	1,468	1,324
Depreciation and amortization	438	375	1,250	1,107
Other operating expenses	1,079	958	3,188	2,868
Total operating expenses	6,832	6,408	20,510	18,640
OPERATING INCOME	38	117	43	628
OTHER EXPENSES (INCOME):
Interest expense	63	63	191	193
Capitalized interest	(9)	(4)	(24)	(15)
Interest income	(121)	(156)	(392)	(425)
Other (gains) losses, net	16	(23)	(1)	(44)
Total other income	(51)	(120)	(226)	(291)
INCOME BEFORE INCOME TAXES	89	237	269	919
PROVISION FOR INCOME TAXES	22	44	65	202
NET INCOME	$ 67	$ 193	$ 204	$ 717
Net income per share, basic (in USD per share)	$ 0.11	$ 0.32	$ 0.34	$ 1.20
Net income per share, diluted (in USD per share)	$ 0.11	$ 0.31	$ 0.34	$ 1.15
COMPREHENSIVE INCOME	$ 19	$ 336	$ 167	$ 574
WEIGHTED AVERAGE SHARES OUTSTANDING
Basic (in shares)	599	596	598	595
Diluted (in shares)	601	640	643	639
Passenger
OPERATING REVENUES:
Total operating revenues	$ 6,250	$ 5,912	$ 18,673	$ 17,426
Freight
OPERATING REVENUES:
Total operating revenues	43	44	131	131
Other
OPERATING REVENUES:
Total operating revenues	$ 577	$ 569	$ 1,749	$ 1,711