CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (LOSS) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
OPERATING REVENUES:
Total operating revenues	$ 803,614	$ 691,831
OPERATING EXPENSES:
Salaries, wages and benefits	350,999	335,201
Aircraft maintenance, materials and repairs	145,415	142,226
Depreciation and amortization	95,870	94,149
Aircraft fuel	21,164	20,964
Airport-related expenses	20,888	18,295
Aircraft rentals	1,276	19,528
Other operating expenses	68,496	66,172
Total operating expenses	704,108	696,535
OPERATING INCOME (LOSS)	99,506	(4,704)
OTHER INCOME (EXPENSE):
Interest income	11,626	10,033
Interest expense	(29,829)	(33,620)
Other income (loss), net	(1,128)	2,174
Total other expense, net	(19,331)	(21,413)
INCOME (LOSS) BEFORE INCOME TAXES	80,175	(26,117)
PROVISION (BENEFIT) FOR INCOME TAXES	19,877	(4,046)
NET INCOME (LOSS)	$ 60,298	$ (22,071)
BASIC EARNINGS (LOSS) PER SHARE (in dollars per share)	$ 1.50	$ (0.45)
DILUTED EARNINGS (LOSS) PER SHARE (in dollars per share)	$ 1.45	$ (0.45)
Weighted average common shares:
Basic (in shares)	40,299	49,391
Diluted (in shares)	41,492	49,391
COMPREHENSIVE INCOME (LOSS):
Net income (loss)	$ 60,298	$ (22,071)
Net unrealized appreciation (depreciation) on marketable securities, net of taxes	(173)	1,480
TOTAL COMPREHENSIVE INCOME (LOSS)	60,125	(20,591)
Flying agreements
OPERATING REVENUES:
Total operating revenues	778,289	663,838
Lease, airport services and other
OPERATING REVENUES:
Total operating revenues	$ 25,325	$ 27,993