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Consolidated Statements of Cash Flows - USD ($)
$ in Thousands
 12 Months Ended
Sep. 30, 2024
Sep. 30, 2023
Sep. 30, 2022
Cash flows from operating activities:      
Net (Loss)/Income $ (91,015) $ (120,116) $ (182,678)
Adjustments to reconcile net loss to net cash flows provided by (used in)) operating activities:      
Depreciation and amortization 40,041 60,359 81,508
Stock compensation expense 1,329 2,275 2,761
Unrealized loss/(gain) on investments, net 6,145 (5,408) 13,715
Realized gain on investments, net (8,032)    
Deferred income taxes (242) (9,304) (52,221)
Amortization of deferred credits (1,067) 1,535 (852)
Amortization of debt discount and issuance costs and accretion of interest into long-term debt 8,334 6,324 9,681
Asset impairment 73,709 54,343 171,824
(Gain)/Loss on sale of assets 682 (7,162) (4,723)
Loss/(Gain) on extinguishment of debt (2,954) 1,505 397
Gain on debt forgiveness (10,500)    
Other 4,277 2,236 867
Changes in assets and liabilities:      
Receivables 2,990 (4,275) (811)
Expendable parts and supplies (1,334) (2,530) (2,882)
Prepaid expenses and other operating assets and liabilities 4,126 (769) (679)
Accounts payable 13,742 496 (2,772)
Deferred heavy maintenance, net (1,637) (1,382) (8,066)
Deferred revenue (11,068) (3,020) (10,432)
Accrued expenses and other liabilities 7,281 (3,938) (3,175)
Operating lease right-of-use assets and liabilities (563) 4,740 1,900
Net cash provided by (used in) operating activities 34,244 (24,091) 13,362
Cash flows from investing activities:      
Capital expenditures (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 158,334 178,644 50,000
Investment transaction costs (380)    
Receipt (payment) of equipment and other deposits 1,530 282 (7,621)
Net cash provided by investing activities 148,788 142,285 1,365
Cash flows from financing activities:      
Proceeds from long-term debt 86,855 60,878 39,811
Principal payments on long-term debt and finance leases (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 (200,474) (143,147) (77,569)
Net change in cash, cash equivalents and restricted cash (17,442) (24,953) (62,842)
Cash, cash equivalents and restricted cash at beginning of period 36,072 61,025 123,867
Cash, cash equivalents and restricted cash at end of period 18,630 36,072 61,025
Supplemental cash flow information      
Cash paid for interest 31,492 38,410 24,895
Cash paid for income taxes, net   419 487
Operating lease payments in operating cash flows 4,585 9,476 36,262
Supplemental non-cash operating activities      
Right-of-use assets obtained in exchange for lease liabilities 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 $ 10,500    
Acquisition of finance leases     15,122
Investments in warrants to purchase common stock     3,260
Accrued capital expenditures   $ 196 $ 1,121