CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023
OPERATING REVENUES:
Total operating revenues	$ 912,786	$ 766,171	$ 2,583,518	$ 2,183,645
OPERATING EXPENSES:
Salaries, wages and benefits	377,435	333,017	1,083,439	990,659
Aircraft maintenance, materials and repairs	181,652	178,465	510,334	483,182
Depreciation and amortization	96,662	96,560	289,346	287,878
Aircraft fuel	22,724	23,330	65,216	62,573
Airport-related expenses	22,642	18,398	61,065	53,648
Aircraft rentals	1,339	2,099	3,925	24,055
Other operating expenses	78,897	65,011	219,612	205,203
Total operating expenses	781,351	716,880	2,232,937	2,107,198
OPERATING INCOME	131,435	49,291	350,581	76,447
OTHER INCOME (EXPENSE):
Interest income	12,460	11,234	36,126	31,761
Interest expense	(27,808)	(32,543)	(86,603)	(99,881)
Other income (loss), net	109	(3,631)	(1,567)	7,544
Total other expense, net	(15,239)	(24,940)	(52,044)	(60,576)
INCOME BEFORE INCOME TAXES	116,196	24,351	298,537	15,871
PROVISION (BENEFIT) FOR INCOME TAXES	26,487	873	72,952	(955)
NET INCOME	$ 89,709	$ 23,478	$ 225,585	$ 16,826
BASIC EARNINGS PER SHARE (in dollars per share)	$ 2.23	$ 0.56	$ 5.61	$ 0.37
DILUTED EARNINGS PER SHARE (in dollars per share)	$ 2.16	$ 0.55	$ 5.44	$ 0.37
Weighted average common shares:
Basic (in shares)	40,253	41,826	40,244	45,018
Diluted (in shares)	41,561	42,580	41,495	45,540
COMPREHENSIVE INCOME:
Net income	$ 89,709	$ 23,478	$ 225,585	$ 16,826
Net unrealized appreciation (depreciation) on marketable securities, net of taxes	883	624	50	3,618
TOTAL COMPREHENSIVE INCOME	90,592	24,102	225,635	20,444
Flying agreements
OPERATING REVENUES:
Total operating revenues	883,494	741,898	2,499,953	2,106,130
Lease, airport services and other
OPERATING REVENUES:
Total operating revenues	$ 29,292	$ 24,273	$ 83,565	$ 77,515