CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2025	Jun. 30, 2024	Jun. 30, 2025	Jun. 30, 2024
OPERATING REVENUES:
Total operating revenues	$ 1,035,227	$ 867,118	$ 1,983,682	$ 1,670,732
OPERATING EXPENSES:
Salaries, wages and benefits	390,243	355,005	767,554	706,004
Aircraft maintenance, materials and repairs	238,885	183,267	447,985	328,682
Depreciation and amortization	90,150	96,814	179,596	192,684
Airport-related expenses	27,116	17,535	54,939	38,423
Aircraft fuel	27,459	21,328	51,947	42,492
Other operating expenses	91,246	73,529	172,156	143,301
Total operating expenses	865,099	747,478	1,674,177	1,451,586
OPERATING INCOME	170,128	119,640	309,505	219,146
OTHER INCOME (EXPENSE):
Interest income	11,050	12,040	21,136	23,666
Interest expense	(26,566)	(28,966)	(53,684)	(58,795)
Other income (expense), net	8,504	(548)	6,877	(1,676)
Total other expense, net	(7,012)	(17,474)	(25,671)	(36,805)
INCOME BEFORE INCOME TAXES	163,116	102,166	283,834	182,341
PROVISION FOR INCOME TAXES	42,847	26,588	63,014	46,465
NET INCOME	$ 120,269	$ 75,578	$ 220,820	$ 135,876
BASIC EARNINGS PER SHARE (in dollars per share)	$ 2.98	$ 1.88	$ 5.46	$ 3.38
DILUTED EARNINGS PER SHARE (in dollars per share)	$ 2.91	$ 1.82	$ 5.32	$ 3.28
Weighted average common shares:
Basic (in shares)	40,416	40,179	40,453	40,239
Diluted (in shares)	41,351	41,431	41,475	41,462
COMPREHENSIVE INCOME:
Net Income (Loss)	$ 120,269	$ 75,578	$ 220,820	$ 135,876
Net unrealized depreciation on marketable securities, net of taxes	(76)	(660)	(151)	(833)
TOTAL COMPREHENSIVE INCOME	120,193	74,918	220,669	135,043
Flying agreements
OPERATING REVENUES:
Total operating revenues	987,511	838,170	1,903,505	1,616,459
Lease, airport services and other
OPERATING REVENUES:
Total operating revenues	$ 47,716	$ 28,948	$ 80,177	$ 54,273