CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands	Mar. 31, 2025	Dec. 31, 2024
CURRENT ASSETS:
Cash and cash equivalents	$ 178,973	$ 227,362
Marketable securities	571,911	574,266
Receivables, net	137,161	122,778
Inventories, net	140,166	139,002
Other current assets	42,913	53,659
Total current assets	1,071,124	1,117,067
PROPERTY AND EQUIPMENT:
Aircraft and rotable spares	8,883,675	8,774,570
Deposits on aircraft	70,752	65,612
Buildings and ground equipment	299,983	292,682
Total property and equipment, gross	9,254,410	9,132,864
Less-accumulated depreciation and amortization	(3,631,603)	(3,545,456)
Total property and equipment, net	5,622,807	5,587,408
OTHER ASSETS:
Operating lease right-of-use assets	83,726	87,731
Long-term receivables and other assets	336,609	347,661
Total other assets	420,335	435,392
Total assets	7,114,266	7,139,867
CURRENT LIABILITIES:
Current maturities of long-term debt	486,119	535,589
Accounts payable	576,056	527,351
Accrued salaries, wages and benefits	201,788	226,770
Current maturities of operating lease liabilities	20,379	20,467
Taxes other than income taxes	18,894	22,581
Other current liabilities	113,688	96,833
Total current liabilities	1,416,924	1,429,591
LONG-TERM DEBT, net of current maturities	2,073,463	2,136,786
DEFERRED INCOME TAXES PAYABLE	806,042	787,968
NONCURRENT OPERATING LEASE LIABILITIES	63,347	67,264
OTHER LONG-TERM LIABILITIES	280,199	309,477
COMMITMENTS AND CONTINGENCIES (Note 7)
STOCKHOLDERS' EQUITY:
Preferred stock, 5,000,000 shares authorized; none issued
Common stock, no par value, 120,000,000 shares authorized; 84,250,565 and 83,638,680 shares issued as of March 31, 2025, and December 31, 2024, respectively	783,048	777,090
Retained earnings	2,694,724	2,594,173
Treasury stock, at cost, 43,691,380 and 43,310,324 shares as of March 31, 2025, and December 31, 2024, respectively	(1,003,574)	(962,650)
Accumulated other comprehensive income	93	168
Total stockholders' equity	2,474,291	2,408,781
Total liabilities and stockholders' equity	$ 7,114,266	$ 7,139,867