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CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands | Dec. 31, 2021 | Dec. 31, 2020
--- | --- | ---
CURRENT ASSETS: |  |
Cash and cash equivalents | $ 258,421 | $ 215,723
Marketable securities | 601,989 | 610,185
Receivables, net | 65,348 | 34,462
Inventories, net | 104,093 | 91,196
Other current assets | 38,742 | 31,236
Total current assets | 1,068,593 | 982,802
PROPERTY AND EQUIPMENT: |  |
Aircraft and rotable spares | 7,848,100 | 7,527,555
Deposits on aircraft | 124,964 | 31,625
Buildings and ground equipment | 256,595 | 258,863
Total property and equipment, gross | 8,229,659 | 7,818,043
Less-accumulated depreciation and amortization | (2,731,060) | (2,455,995)
Total property and equipment, net | 5,498,599 | 5,362,048
OTHER ASSETS: |  |
Operating lease right-of-use assets | 238,516 | 282,362
Long-term receivables and other assets | 320,239 | 260,410
Total other assets | 558,755 | 542,772
Total assets | 7,125,947 | 6,887,622
CURRENT LIABILITIES: |  |
Current maturities of long-term debt | 391,798 | 402,158
Accounts payable | 496,333 | 278,677
Accrued salaries, wages and benefits | 150,583 | 125,944
Current maturities of operating lease liabilities | 78,886 | 82,641
Taxes other than income taxes | 28,869 | 26,183
Other current liabilities | 48,152 | 26,119
Total current liabilities | 1,194,621 | 941,722
LONG-TERM DEBT, net of current maturities | 2,717,420 | 2,801,538
DEFERRED INCOME TAXES PAYABLE | 663,236 | 625,931
NONCURRENT OPERATING LEASE LIABILITIES | 158,274 | 205,845
OTHER LONG-TERM LIABILITIES | 124,882 | 173,041
COMMITMENTS AND CONTINGENCIES (Note 6) |  |
STOCKHOLDERS' EQUITY: |  |
Preferred stock, 5,000,000 shares authorized; none issued |  |
Common stock, no par value, 120,000,000 shares authorized; 82,335,970 and 82,094,985 shares issued as of December 31, 2021, and December 31, 2020, respectively | 722,310 | 704,675
Retained earnings | 2,163,916 | 2,052,006
Treasury stock, at cost, 31,956,047 and 31,913,635 shares as of December 31, 2021, and December 31, 2020, respectively | (618,712) | (617,136)
Total stockholders' equity | 2,267,514 | 2,139,545
Total liabilities and stockholders' equity | $ 7,125,947 | $ 6,887,622

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