Condensed Statements of Operations (unaudited) - USD ($)	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Operating revenues:
Revenues	$ 138,529,000	$ 1,012,956,000	$ 909,610,000	$ 1,868,752,000
Operating expenses:
Aircraft fuel	19,910,000	265,006,000	233,118,000	494,642,000
Salaries, wages and benefits	213,579,000	216,375,000	454,059,000	420,276,000
Landing fees and other rents	40,348,000	64,711,000	107,469,000	124,360,000
Depreciation and amortization	69,113,000	54,913,000	135,104,000	105,639,000
Aircraft rent	49,256,000	46,522,000	94,402,000	92,304,000
Distribution	11,352,000	40,602,000	45,095,000	76,321,000
Maintenance, materials and repairs	19,227,000	34,688,000	53,303,000	66,292,000
Loss on disposal of assets	0	1,550,000	0	3,463,000
Special credits	(151,911,000)	0	(151,911,000)	0
Other operating	58,039,000	124,651,000	187,347,000	233,713,000
Total operating expenses	328,913,000	849,018,000	1,157,986,000	1,617,010,000
Operating income (loss)	(190,384,000)	163,938,000	(248,376,000)	251,742,000
Other (income) expense:
Interest expense	27,792,000	25,266,000	51,670,000	50,237,000
Capitalized interest	(3,757,000)	(2,975,000)	(7,421,000)	(5,532,000)
Interest income	(1,949,000)	(7,066,000)	(5,542,000)	(13,990,000)
Other (income) expense	66,000	144,000	47,000	377,000
Total other (income) expense	22,152,000	15,369,000	38,754,000	31,092,000
Income (loss) before income taxes	(212,536,000)	148,569,000	(287,130,000)	220,650,000
Provision (benefit) for income taxes	(68,108,000)	34,068,000	(114,874,000)	50,073,000
Net income (loss)	$ (144,428,000)	$ 114,501,000	$ (172,256,000)	$ 170,577,000
Basic earnings (loss) per share (in dollars per share)	$ (1.81)	$ 1.67	$ (2.33)	$ 2.49
Diluted earnings (loss) per share (in dollars per share)	$ (1.81)	$ 1.67	$ (2.33)	$ 2.49
Passenger
Operating revenues:
Revenues	$ 130,817,000	$ 994,430,000	$ 884,367,000	$ 1,832,495,000
Other
Operating revenues:
Revenues	$ 7,712,000	$ 18,526,000	$ 25,243,000	$ 36,257,000