CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
OPERATING REVENUES:
Total operating revenues	$ 799,085	$ 656,990	$ 1,534,237	$ 1,191,545
OPERATING EXPENSES:
Salaries, wages and benefits	288,562	233,423	588,620	453,265
Aircraft maintenance, materials and repairs	174,883	190,879	323,296	394,706
Depreciation and amortization	97,249	109,895	199,994	219,492
Aircraft fuel	31,820	25,867	56,910	45,061
Airport-related expenses	17,490	22,038	36,695	46,486
Aircraft rentals	16,024	15,723	32,020	31,213
Payroll support grant		(114,144)		(307,317)
Other operating expenses	84,455	58,286	156,052	112,774
Total operating expenses	710,483	541,967	1,393,587	995,680
OPERATING INCOME	88,602	115,023	140,650	195,865
OTHER INCOME (EXPENSE):
Interest income	2,559	210	2,984	494
Interest expense	(30,433)	(33,940)	(59,025)	(65,294)
Other income, net	12,019	80	12,899	296
Total other expense, net	(15,855)	(33,650)	(43,142)	(64,504)
INCOME BEFORE INCOME TAXES	72,747	81,373	97,508	131,361
PROVISION FOR INCOME TAXES	18,796	19,379	25,823	33,467
NET INCOME	$ 53,951	$ 61,994	$ 71,685	$ 97,894
BASIC EARNINGS PER SHARE (in dollars per share)	$ 1.07	$ 1.23	$ 1.42	$ 1.95
DILUTED EARNINGS PER SHARE (in dollars per share)	$ 1.07	$ 1.22	$ 1.42	$ 1.93
Weighted average common shares:
Basic (in shares)	50,522	50,346	50,501	50,316
Diluted (in shares)	50,566	50,725	50,637	50,727
COMPREHENSIVE INCOME:
Net income	$ 53,951	$ 61,994	$ 71,685	$ 97,894
Net unrealized depreciation on marketable securities, net of taxes	(1,945)		(1,945)
TOTAL COMPREHENSIVE INCOME	52,006	61,994	69,740	97,894
Flying agreements
OPERATING REVENUES:
Total operating revenues	773,774	632,967	1,481,837	1,144,158
Lease, airport services and other
OPERATING REVENUES:
Total operating revenues	$ 25,311	$ 24,023	$ 52,400	$ 47,387