Condensed Consolidated Statement of Comprehensive Income - USD ($) shares in Millions, $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2024	Jun. 30, 2023	Jun. 30, 2024	Jun. 30, 2023
OPERATING REVENUES:
Total operating revenues	$ 7,354	$ 7,037	$ 13,683	$ 12,743
OPERATING EXPENSES:
Salaries, wages, and benefits	2,999	2,786	5,939	5,264
Fuel and oil	1,599	1,403	3,130	2,950
Maintenance materials and repairs	350	271	711	511
Landing fees and airport rentals	511	459	975	867
Depreciation and amortization	404	367	812	731
Other operating expenses	1,093	956	2,110	1,909
Total operating expenses	6,956	6,242	13,677	12,232
OPERATING INCOME	398	795	6	511
OTHER EXPENSES (INCOME):
Interest expense	63	65	128	130
Capitalized interest	(8)	(5)	(15)	(11)
Interest income	(130)	(144)	(271)	(269)
Other gains, net	(5)	(7)	(17)	(21)
Total other income	(80)	(91)	(175)	(171)
INCOME BEFORE INCOME TAXES	478	886	181	682
PROVISION FOR INCOME TAXES	111	203	44	158
NET INCOME	$ 367	$ 683	$ 137	$ 524
Net income per share, basic (in USD per share)	$ 0.61	$ 1.15	$ 0.23	$ 0.88
Net income per share, diluted (in USD per share)	$ 0.58	$ 1.08	$ 0.23	$ 0.84
COMPREHENSIVE INCOME	$ 359	$ 544	$ 148	$ 238
WEIGHTED AVERAGE SHARES OUTSTANDING
Basic (in shares)	599	595	598	595
Diluted (in shares)	643	639	643	639
Passenger
OPERATING REVENUES:
Total operating revenues	$ 6,712	$ 6,409	$ 12,424	$ 11,514
Freight
OPERATING REVENUES:
Total operating revenues	45	47	87	87
Other
OPERATING REVENUES:
Total operating revenues	$ 597	$ 581	$ 1,172	$ 1,142