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CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
CASH FLOWS FROM OPERATING ACTIVITIES: |  |  |
Net income | $ 34,342 | $ 72,953 | $ 111,910
Adjustments to reconcile net income to net cash provided by operating activities: |  |  |
Depreciation and amortization | 383,115 | 394,552 | 440,198
Stock based compensation expense | 17,125 | 9,159 | 8,685
Decrease in credit loss reserves | (185) | (4,591) | (4,249)
Gain on disposal of fixed assets | (14,295) | (7,948) | (4,586)
Loss (gain) on investments in other companies | 479 | (11,380) |
Net increase in deferred income taxes | 539 | 23,825 | 37,305
Impairment on assets held for sale | 2,318 | 51,384 |
Special items |  |  | 84,592
Changes in operating assets and liabilities: |  |  |
Decrease (increase) in receivables | 19,818 | (32,959) | (30,093)
Decrease (increase) in income tax receivable | 997 | 7,815 | (5,570)
Increase in inventories | (3,905) | (16,628) | (12,897)
Decrease (increase) in other current assets | 1,593 | (2,871) | (1,936)
Decrease in operating lease right-of-use assets | 25,954 | 86,588 | 43,846
Decrease in operating lease liabilities | (54,984) | (76,812) | (51,326)
Increase (decrease) in deferred revenue | 229,862 | 40,812 | (6,832)
Decrease (increase) in unbilled revenue | 12,601 | (11,491) | (8,404)
Increase (decrease) in accounts payable and other current liabilities | 80,960 | (42,032) | 231,177
NET CASH PROVIDED BY OPERATING ACTIVITIES | 736,334 | 480,376 | 831,820
CASH FLOWS FROM INVESTING ACTIVITIES: |  |  |
Purchases of marketable securities | (1,339,465) | (1,834,403) | (1,517,861)
Sales of marketable securities | 1,600,877 | 1,488,359 | 1,526,057
Acquisition of property and equipment: |  |  |
Aircraft and rotable spare parts | (238,068) | (632,460) | (537,574)
Buildings and ground equipment | (13,258) | (13,031) | (18,127)
Proceeds from the sale of property and equipment | 15,879 | 16,983 | 7,117
Deposits on aircraft | (65,000) | (37,100) | (125,701)
Aircraft deposits applied towards acquired aircraft | 11,649 | 138,383 | 32,962
Decrease (increase) in other assets | 4,158 | (31,625) | (65,395)
NET CASH USED IN INVESTING ACTIVITIES | (23,228) | (904,894) | (698,522)
CASH FLOWS FROM FINANCING ACTIVITIES: |  |  |
Proceeds from issuance of long-term debt | 69,689 | 684,502 | 450,032
Principal payments on long-term debt | (447,604) | (415,050) | (540,537)
Payment of debt issuance cost | (175) | (2,178) | (1,665)
Net proceeds from issuance of common stock | 2,811 | 2,957 | 3,146
Employee income tax paid on vested equity awards | (585) | (1,150) | (1,576)
Purchase of treasury stock and related excise tax | (291,949) |  |
NET CASH PROVIDED BY (USED IN) FINANCING ACTIVITIES | (667,813) | 269,081 | (90,600)
Increase (decrease) in cash and cash equivalents | 45,293 | (155,437) | 42,698
Cash and cash equivalents at beginning of period | 102,984 | 258,421 | 215,723
CASH AND CASH EQUIVALENTS AT END OF PERIOD | 148,277 | 102,984 | 258,421
Non-cash investing and financing activities: |  |  |
Acquisition of property and equipment | 12,583 | 16,826 | 11,336
Derecognition of right of use assets | (39,247) |  |
Derecognition of operating lease liabilities | 39,247 |  |
Warrants issued to U.S. Treasury |  |  | 5,804
Cash paid during the period for: |  |  |
Interest, net of capitalized amounts | 128,288 | 125,321 | 124,918
Income taxes | $ 13,610 | $ 1,166 | $ 6,589

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