CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands	Sep. 30, 2022	Dec. 31, 2021
CURRENT ASSETS:
Cash and cash equivalents	$ 38,850	$ 258,421
Marketable securities	965,347	601,989
Receivables, net	72,836	65,348
Inventories, net	118,728	104,093
Other current assets	66,428	38,742
Total current assets	1,262,189	1,068,593
PROPERTY AND EQUIPMENT:
Aircraft and rotable spares	8,262,736	7,848,100
Deposits on aircraft	47,229	124,964
Buildings and ground equipment	262,466	256,595
Total property and equipment, gross	8,572,431	8,229,659
Less-accumulated depreciation and amortization	(2,933,660)	(2,731,060)
Total property and equipment, net	5,638,771	5,498,599
OTHER ASSETS:
Operating lease right-of-use assets	192,709	238,516
Long-term receivables and other assets	360,535	320,239
Total other assets	553,244	558,755
Total assets	7,454,204	7,125,947
CURRENT LIABILITIES:
Current maturities of long-term debt	429,425	391,798
Accounts payable	381,400	496,333
Accrued salaries, wages and benefits	195,082	150,583
Current maturities of operating lease liabilities	74,141	78,886
Taxes other than income taxes	36,213	28,869
Other current liabilities	43,634	48,152
Total current liabilities	1,159,895	1,194,621
LONG-TERM DEBT, net of current maturities	2,982,034	2,717,420
DEFERRED INCOME TAXES PAYABLE	683,828	663,236
NONCURRENT OPERATING LEASE LIABILITIES	117,823	158,274
OTHER LONG-TERM LIABILITIES	114,676	124,882
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; 82,591,558 and 82,335,970 shares issued as of September 30, 2022, and December 31, 2021, respectively	736,406	722,310
Retained earnings	2,283,973	2,163,916
Treasury stock, at cost, 31,994,416 and 31,956,047 shares as of September 30, 2022, and December 31, 2021, respectively	(619,862)	(618,712)
Accumulated other comprehensive loss	(4,569)
Total stockholders' equity	2,395,948	2,267,514
Total liabilities and stockholders' equity	$ 7,454,204	$ 7,125,947