CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands	Sep. 30, 2024	Dec. 31, 2023
CURRENT ASSETS:
Cash and cash equivalents	$ 177,609	$ 148,277
Marketable securities	658,433	686,946
Receivables, net	111,199	82,854
Inventories, net	136,480	127,114
Other current assets	50,496	86,705
Total current assets	1,134,217	1,131,896
PROPERTY AND EQUIPMENT:
Aircraft and rotable spares	8,462,449	8,323,107
Deposits on aircraft	71,457	77,282
Buildings and ground equipment	343,870	282,398
Total property and equipment, gross	8,877,776	8,682,787
Less-accumulated depreciation and amortization	(3,460,508)	(3,199,820)
Total property and equipment, net	5,417,268	5,482,967
OTHER ASSETS:
Operating lease right-of-use assets	85,303	86,727
Long-term receivables and other assets	319,812	324,703
Total other assets	405,115	411,430
Total assets	6,956,600	7,026,293
CURRENT LIABILITIES:
Current maturities of long-term debt	496,789	443,869
Accounts payable	460,276	470,251
Accrued salaries, wages and benefits	211,149	194,881
Current maturities of operating lease liabilities	18,496	19,335
Taxes other than income taxes	26,660	26,077
Other current liabilities	100,804	99,879
Total current liabilities	1,314,174	1,254,292
LONG-TERM DEBT, net of current maturities	2,196,548	2,562,183
DEFERRED INCOME TAXES PAYABLE	751,983	687,600
NONCURRENT OPERATING LEASE LIABILITIES	66,807	67,392
OTHER LONG-TERM LIABILITIES	315,591	341,324
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; 83,601,235 and 82,840,372 shares issued as of September 30, 2024, and December 31, 2023, respectively	772,320	754,362
Retained earnings	2,496,796	2,271,211
Treasury stock, at cost, 43,262,997 and 42,615,347 shares as of September 30, 2024, and December 31, 2023, respectively	(957,994)	(912,396)
Accumulated other comprehensive income	375	325
Total stockholders' equity	2,311,497	2,113,502
Total liabilities and stockholders' equity	$ 6,956,600	$ 7,026,293