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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
Operating Activities |  |  |
Net income/(loss) | $ 614,622 | $ (97,024) | $ 436,632
Adjustments to reconcile net income/(loss) to net cash provided by operating activities: |  |  |
Depreciation of flight equipment | 1,068,772 | 965,955 | 882,562
Write-off of Russian fleet, net of (recoveries) | (67,022) | 771,476 | 0
Stock-based compensation expense | 34,615 | 15,603 | 26,516
Deferred taxes | 133,358 | (43,492) | 97,446
Amortization of prepaid lease costs | 75,389 | 47,849 | 46,547
Amortization of discounts and debt issuance costs | 54,053 | 53,254 | 50,620
Gain on aircraft sales, trading and other activity | (226,945) | (113,103) | (46,109)
Changes in operating assets and liabilities: |  |  |
Other assets | 48,310 | (232,613) | (176,391)
Accrued interest and other payables | 13,333 | 255 | 63,112
Rentals received in advance | (1,605) | 13,990 | (4,099)
Net cash provided by operating activities | 1,746,880 | 1,382,150 | 1,376,836
Investing Activities |  |  |
Acquisition of flight equipment under operating lease | (3,789,113) | (2,904,723) | (2,506,175)
Payments for deposits on flight equipment purchases | (433,452) | (518,270) | (496,838)
Proceeds from aircraft sales, trading and other activity | 1,684,814 | 235,424 | 137,887
Proceeds from settlement of insurance claim | 64,714 | 0 | 0
Acquisition of aircraft furnishings, equipment and other assets | (305,346) | (216,635) | (229,654)
Net cash used in investing activities | (2,778,383) | (3,404,204) | (3,094,780)
Financing Activities |  |  |
Issuance of common stock upon exercise of options | 0 | 0 | 1,438
Net proceeds from preferred stock issuance | 0 | 0 | 591,340
Cash dividends paid on Class A common stock | (88,792) | (83,253) | (73,001)
Common shares repurchased | 0 | (150,000) | (5,780)
Cash dividends paid on preferred stock | (41,700) | (41,700) | (28,473)
Tax withholdings on stock-based compensation | (3,354) | (8,903) | (7,441)
Net change in unsecured revolving facility | 80,000 | 1,020,000 | 0
Proceeds from debt financings | 2,993,732 | 2,659,996 | 3,655,830
Payments in reduction of debt financings | (2,593,338) | (2,085,898) | (3,194,482)
Debt issuance costs | (13,052) | (6,827) | (10,245)
Security deposits and maintenance reserve receipts | 398,345 | 417,224 | 174,521
Security deposits and maintenance reserve disbursements | (15,863) | (26,860) | (35,238)
Net cash provided by financing activities | 715,978 | 1,693,779 | 1,068,469
Net (decrease)/increase in cash | (315,525) | (328,275) | (649,475)
Cash, cash equivalents and restricted cash at beginning of period | 780,017 | 1,108,292 | 1,757,767
Cash, cash equivalents and restricted cash at end of period | 464,492 | 780,017 | 1,108,292
Supplemental Disclosure of Cash Flow Information |  |  |
Cash paid during the period for interest, including capitalized interest of $43,093, $39,655 and $49,070 at December 31, 2023, 2022 and 2021, respectively | 693,826 | 533,897 | 508,616
Cash paid for income taxes | 7,801 | 6,362 | 5,734
Supplemental Disclosure of Noncash Activities |  |  |
Buyer furnished equipment, capitalized interest and deposits on flight equipment purchases applied to acquisition of flight equipment and other assets | 827,377 | 914,501 | 1,009,554
Flight equipment subject to operating leases reclassified to flight equipment held for sale | 1,730,212 | 377,131 | 72,297
Flight equipment subject to operating leases reclassified to investment in sales-type lease | 66,907 | 255,205 | 27,835
Cash dividends declared on Class A common stock, not yet paid | $ 23,316 | $ 22,178 | $ 21,088

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