CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
OPERATING REVENUES:
Total operating revenues	$ 744,783	$ 457,493	$ 1,936,328	$ 1,537,469
OPERATING EXPENSES:
Salaries, wages and benefits	265,603	194,516	718,868	613,895
Aircraft maintenance, materials and repairs	209,795	150,148	604,501	431,654
Depreciation and amortization	109,597	121,467	329,089	364,813
Airport-related expenses	25,992	18,003	72,478	70,192
Aircraft fuel	32,561	13,641	77,622	45,875
Aircraft rentals	16,098	15,785	47,311	49,537
Special items - impairment charges	84,592		84,592
Payroll support grant	(115,352)	(190,200)	(422,669)	(342,138)
Other operating expenses	68,847	59,580	181,621	167,170
Total operating expenses	697,733	382,940	1,693,413	1,400,998
OPERATING INCOME	47,050	74,553	242,915	136,471
OTHER INCOME (EXPENSE):
Interest income	238	1,403	732	5,652
Interest expense	(28,980)	(30,150)	(94,274)	(91,280)
Other income (expense), net	(4,098)	405	(3,802)	1,205
Total other expense, net	(32,840)	(28,342)	(97,344)	(84,423)
INCOME BEFORE INCOME TAXES	14,210	46,211	145,571	52,048
PROVISION FOR INCOME TAXES	4,526	12,549	37,993	14,113
NET INCOME	$ 9,684	$ 33,662	$ 107,578	$ 37,935
BASIC EARNINGS PER SHARE (in dollars per share)	$ 0.19	$ 0.67	$ 2.14	$ 0.76
DILUTED EARNINGS PER SHARE (in dollars per share)	$ 0.19	$ 0.66	$ 2.12	$ 0.75
Weighted average common shares:
Basic (in shares)	50,380	50,181	50,337	50,199
Diluted (in shares)	50,725	50,622	50,726	50,445
COMPREHENSIVE INCOME:
Net income	$ 9,684	$ 33,662	$ 107,578	$ 37,935
Net unrealized depreciation on marketable securities, net of taxes		(307)
TOTAL COMPREHENSIVE INCOME	9,684	33,355	107,578	37,935
Flying agreements
OPERATING REVENUES:
Total operating revenues	719,084	445,048	1,863,242	1,490,912
Lease, airport services and other
OPERATING REVENUES:
Total operating revenues	$ 25,699	$ 12,445	$ 73,086	$ 46,557