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Consolidated Statements of Cash Flows - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Sep. 30, 2024
Sep. 30, 2023
Sep. 30, 2022
Cash flows from operating activities:          
Net (Loss) $ (111,943) $ (57,850) $ (91,015) $ (120,116) $ (182,678)
Adjustments to reconcile net loss to net cash flows provided by (used in) operating activities:          
Depreciation and amortization 7,979 13,293 40,041 60,359 81,508
Stock compensation expense 279 427 1,329 2,275 2,761
Unrealized loss/(gain) on investments, net 42 (2,451) 6,145 (5,408) 13,715
Realized gain on investments, net 0   (8,032)    
Deferred income taxes (5,235) 428 (242) (9,304) (52,221)
Amortization of deferred credits (984) (153) (1,067) 1,535 (852)
Amortization of debt discount and issuance costs and accretion of interest into long-term debt 1,390 2,291 8,334 6,324 9,681
Asset impairment 65,665 40,384 73,709 54,343 171,824
Loss/(Gain) on sale of assets 46,691 386 682 (7,162) (4,723)
(Gain)/Loss on extinguishment of debt 0 (2,954) (2,954) 1,505 397
(Gain) on debt forgiveness (4,500)   (10,500)    
Other 3,628 912 4,277 2,236 867
Changes in assets and liabilities:          
Receivables (2,934) 2,736 2,990 (4,275) (811)
Expendable parts and supplies (900) 415 (1,334) (2,530) (2,882)
Prepaid expenses and other operating assets and liabilities 954 2,604 4,126 (769) (679)
Accounts payable (11,164) (3,903) 13,742 496 (2,772)
Deferred heavy maintenance, net     (1,637) (1,382) (8,066)
Deferred revenue 5,645 (3,002) (11,068) (3,020) (10,432)
Accrued expenses and other liabilities (6,186) (1,513) 7,281 (3,938) (3,175)
Operating lease right-of-use assets and liabilities 12 109 (563) 4,740 1,900
Net cash (used in) provided by operating activities (11,561) (7,841) 34,244 (24,091) 13,362
Cash flows from investing activities:          
Capital expenditures (2,065) (6,884) (20,313) (36,641) (40,814)
Proceeds from (purchases of) investments in equity securities, net     9,617   (200)
Proceeds from sale of aircraft and engines, net of transaction costs 117,685 53,489 158,334 178,644 50,000
Investment transaction costs     (380)    
Receipt (payment) of equipment and other deposits 214   1,530 282 (7,621)
Net cash provided by investing activities 115,834 46,605 148,788 142,285 1,365
Cash flows from financing activities:          
Proceeds from long-term debt   81,855 86,855 60,878 39,811
Principal payments on long-term debt and finance leases (79,919) (137,489) (286,299) (203,029) (114,910)
Payments of debt and warrant issuance costs       (917) (2,414)
Proceeds from issuance of common stock under ESPP     30 284 399
Debt prepayment costs     (922)    
Payment of tax withholding for RSUs     (138) (363) (455)
Net cash used in financing activities (79,919) (55,634) (200,474) (143,147) (77,569)
Net change in cash, cash equivalents and restricted cash 24,354 (16,870) (17,442) (24,953) (62,842)
Cash, cash equivalents and restricted cash at beginning of period 18,630 36,072 36,072 61,025 123,867
Cash, cash equivalents and restricted cash at end of period 42,984 19,202 18,630 36,072 61,025
Supplemental cash flow information          
Cash paid for interest 5,686 6,948 31,492 38,410 24,895
Cash paid for income taxes, net       419 487
Operating lease payments in operating cash flows 786 1,211 4,585 9,476 36,262
Supplemental non-cash operating activities          
Right-of-use assets obtained in exchange for lease liabilities   $ 339 419 2,919 6,286
Supplemental non-cash financing activities          
Finance lease obtained in exchange for lease liability       65,481  
Principal payments in exchange for transfer of equity investment     12,610    
Principal forgiven $ 4,500   $ 10,500    
Acquisition of finance leases         15,122
Investments in warrants to purchase common stock         3,260
Accrued capital expenditures       $ 196 $ 1,121