Consolidated Statements of Operations (Unaudited) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Operating Revenue	$ 825,253	$ 663,918	$ 1,468,755	$ 1,343,601
Operating Expenses
Salaries, wages and benefits	192,591	141,450	340,335	286,924
Aircraft fuel	83,242	122,158	191,560	228,479
Travel	34,627	46,374	77,018	91,403
Navigation fees, landing fees and other rent	35,638	37,982	67,039	78,198
Passenger and ground handling services	30,130	30,525	62,089	62,685
Aircraft rent	24,316	40,335	48,283	82,223
Loss (gain) on disposal of aircraft	2	0	(6,715)	0
Special charge	15,934	3,269	15,934	3,269
Transaction-related expenses	1,275	734	1,796	3,261
Other	52,710	54,961	103,822	106,054
Total Operating Expenses	704,591	654,948	1,287,023	1,287,757
Operating Income	120,662	8,970	181,732	55,844
Non-operating Expenses (Income)
Interest income	(224)	(1,278)	(704)	(3,322)
Interest expense	28,950	30,045	58,225	60,398
Capitalized interest	(132)	(627)	(325)	(1,090)
Loss on early extinguishment of debt	74	0	74	245
Unrealized loss (gain) on financial instruments	30,671	(42,300)	29,747	4,275
Other (income) expense, net	(50,598)	945	(49,392)	(2,030)
Total Non-operating Expenses (Income)	8,741	(13,215)	37,625	58,476
Income (loss) before income taxes	111,921	22,185	144,107	(2,632)
Income tax expense (benefit)	33,009	(64,683)	41,842	(59,790)
Net Income	$ 78,912	$ 86,868	$ 102,265	$ 57,158
Earnings per share:
Basic	$ 3.02	$ 3.36	$ 3.93	$ 2.22
Diluted	$ 3.01	$ 1.61	$ 3.92	$ 2.21
Weighted average shares:
Basic	26,129	25,851	26,048	25,794
Diluted	26,182	26,953	26,074	25,921
Service [Member]
Operating Expenses
Maintenance, materials and repairs	$ 168,300	$ 113,471	$ 262,452	$ 217,091
Depreciation and amortization	$ 65,826	$ 63,689	$ 123,410	$ 128,170