Condensed Statements of Operations (unaudited) - USD ($)	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Operating revenues:
Revenues	$ 771,081,000	$ 855,796,000
Operating expenses:
Aircraft fuel	213,208,000	229,636,000
Salaries, wages and benefits	240,480,000	203,901,000
Landing fees and other rents	67,121,000	59,649,000
Depreciation and amortization	65,991,000	50,726,000
Aircraft rent	45,146,000	45,782,000
Distribution	33,743,000	35,719,000
Maintenance, materials and repairs	34,076,000	31,604,000
Loss on disposal of assets	0	1,913,000
Other operating	129,308,000	109,062,000
Total operating expenses	829,073,000	767,992,000
Operating income (loss)	(57,992,000)	87,804,000
Other (income) expense:
Interest expense	23,878,000	24,971,000
Capitalized interest	(3,664,000)	(2,557,000)
Interest income	(3,593,000)	(6,924,000)
Other (income) expense	(19,000)	233,000
Total other (income) expense	16,602,000	15,723,000
Income (loss) before income taxes	(74,594,000)	72,081,000
Provision (benefit) for income taxes	(46,766,000)	16,005,000
Net income (loss)	$ (27,828,000)	$ 56,076,000
Basic earnings (loss) per share (in dollars per share)	$ (0.41)	$ 0.82
Diluted earnings (loss) per share (in dollars per share)	$ (0.41)	$ 0.82
Passenger [Member]
Operating revenues:
Revenues	$ 753,550,000	$ 838,065,000
Other
Operating revenues:
Revenues	$ 17,531,000	$ 17,731,000