Statements Of Operations - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Operating revenues:
Total operating revenues	$ 3,830,536	$ 3,323,034	$ 2,643,552
Operating expenses:
Aircraft fuel	993,478	939,324	615,581
Salaries, wages and benefits	865,019	719,635	527,959
Landing fees and other rents	256,275	214,677	180,655
Depreciation and amortization	225,264	176,727	140,152
Aircraft rent	182,609	177,641	205,852
Distribution	153,770	137,001	113,472
Maintenance, materials and repairs	143,575	129,078	110,439
Loss on disposal of assets	17,350	9,580	4,168
Special charges	717	88,921	12,629
Other operating	491,432	379,536	347,820
Total operating expenses	3,329,489	2,972,120	2,258,727
Operating income	501,047	350,914	384,825
Other (income) expense:
Interest expense	101,350	83,777	57,302
Capitalized interest	(12,471)	(9,841)	(13,793)
Interest income	(25,133)	(19,107)	(8,736)
Other expense	875	752	366
Special charges, non-operating	0	90,357	0
Total other (income) expense	64,621	145,938	35,139
Income before income taxes	436,426	204,976	349,686
Provision (benefit) for income taxes	101,171	49,227	(65,836)
Net income	$ 335,255	$ 155,749	$ 415,522
Basic earnings per share	$ 4.90	$ 2.28	$ 6.00
Diluted earnings per share	$ 4.89	$ 2.28	$ 5.99
Passenger
Operating revenues:
Total operating revenues	$ 3,757,605	$ 3,260,015	$ 2,572,887
Other
Operating revenues:
Total operating revenues	$ 72,931	$ 63,019	$ 70,665