CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME - USD ($) shares in Thousands, $ in Thousands	3 Months Ended
	Mar. 31, 2023	Mar. 31, 2022
OPERATING REVENUES:
Total operating revenues	$ 691,831	$ 735,152
OPERATING EXPENSES:
Salaries, wages and benefits	335,201	300,058
Aircraft maintenance, materials and repairs	142,226	148,413
Depreciation and amortization	94,149	102,745
Aircraft fuel	20,964	25,090
Aircraft rentals	19,528	15,996
Airport-related expenses	18,295	19,205
Other operating expenses	66,172	71,597
Total operating expenses	696,535	683,104
OPERATING INCOME (LOSS)	(4,704)	52,048
OTHER INCOME (EXPENSE):
Interest income	10,033	425
Interest expense	(33,620)	(28,592)
Other income, net	2,174	880
Total other expense, net	(21,413)	(27,287)
INCOME (LOSS) BEFORE INCOME TAXES	(26,117)	24,761
PROVISION (BENEFIT) FOR INCOME TAXES	(4,046)	7,027
NET INCOME (LOSS)	$ (22,071)	$ 17,734
BASIC EARNINGS (LOSS) PER SHARE (in dollars per share)	$ (0.45)	$ 0.35
DILUTED EARNINGS (LOSS) PER SHARE (in dollars per share)	$ (0.45)	$ 0.35
Weighted average common shares:
Basic (in shares)	49,391	50,480
Diluted (in shares)	49,391	50,708
COMPREHENSIVE INCOME (LOSS):
Net income (loss)	$ (22,071)	$ 17,734
Net unrealized appreciation on marketable securities, net of taxes	1,480
TOTAL COMPREHENSIVE INCOME (LOSS)	(20,591)	17,734
Flying agreements
OPERATING REVENUES:
Total operating revenues	663,838	708,063
Lease, airport services and other
OPERATING REVENUES:
Total operating revenues	$ 27,993	$ 27,089