Consolidated Statements of Operations - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Operating revenues:
Total operating revenues	$ 3,775	$ 3,589	$ 3,326
Operating expenses:
Aircraft fuel	1,041	1,130	1,160
Salaries, wages and benefits	954	858	715
Aircraft rent	675	554	556
Station operations	637	516	422
Maintenance, materials and repairs	209	179	146
Sales and marketing	178	164	164
Depreciation and amortization	72	50	45
Transaction and merger-related costs	0	1	10
Other operating	(49)	140	153
Total operating expenses	3,717	3,592	3,371
Operating income (loss)	58	(3)	(45)
Other income (expense):
Interest expense	(36)	(29)	(21)
Capitalized interest	32	28	11
Interest income and other	32	36	10
Total other income (expense)	28	35	0
Income (loss) before income taxes	86	32	(45)
Income tax expense (benefit)	1	43	(8)
Net income (loss)	$ 85	$ (11)	$ (37)
Earnings (loss) per share:
Basic (in dollars per share)	$ 0.37	$ (0.05)	$ (0.17)
Diluted (in dollars per share)	$ 0.37	$ (0.05)	$ (0.17)
Passenger
Operating revenues:
Total operating revenues	$ 3,683	$ 3,509	$ 3,248
Other
Operating revenues:
Total operating revenues	$ 92	$ 80	$ 78