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Condensed Consolidated Statements of Cash Flows - USD ($)
$ in Thousands
 6 Months Ended
Mar. 31, 2023
Mar. 31, 2022
Cash flows from operating activities:    
Net loss $ (44,211) $ (57,057)
Adjustments to reconcile net loss to net cash flows provided by (used in) operating activities:    
Depreciation and amortization 31,744 41,775
Stock compensation expense 1,356 1,387
(Gain)/Loss on investments, net (416) 8,723
Deferred income taxes (3,207) (16,659)
Amortization of deferred credits 218 (426)
Amortization of debt discount and issuance costs and accretion of interest into long-term debt 2,828 6,605
Asset impairment 20,462 39,475
Other 932 910
Changes in assets and liabilities:    
Receivables (5,946) (3,682)
Expendable parts and supplies (231) (2,249)
Prepaid expenses and other operating assets and liabilities 110 (1,741)
Accounts payable (11,685) 14,413
Deferred heavy maintenance, net (1,382) (2,430)
Deferred revenue 413 (4,957)
Accrued expenses and other liabilities (2,672) (7,048)
Operating lease right-of-use assets and liabilities 3,051 (7,081)
Net cash provided by (used in) operating activities (8,636) 9,958
Cash flows from investing activities:    
Capital expenditures (24,530) (22,850)
Investments in equity securities   (200)
Proceeds from sale of aircraft and engines 86,104  
Refund (payment) of equipment and other deposits 227 (6,954)
Net cash provided by (used in) investing activities 61,801 (30,004)
Cash flows from financing activities:    
Proceeds from long-term debt 39,000 30,811
Proceeds from issuance of common stock under ESPP 148 239
Principal payments on long-term debt and finance leases (97,776) (53,135)
Payments of debt and warrant issuance costs (917) (2,414)
Repurchase of stock (30) (75)
Excess tax benefit from vesting of restricted stock (43)  
Net cash used in financing activities (59,618) (24,574)
Net change in cash, cash equivalents and restricted cash (6,453) (44,620)
Cash, cash equivalents and restricted cash at beginning of period 61,025 123,867
Cash, cash equivalents and restricted cash at end of period 54,572 79,247
Supplemental cash flow information    
Cash paid for interest 20,880 9,464
Cash paid for income taxes , net 26 176
Operating lease payments in operating cash flows 6,399 26,224
Supplemental non-cash operating activities    
Right-of-use assets obtained in exchange for lease liabilities 821 4,870
Supplemental non-cash financing activities    
Finance lease obtained in exchange for lease liability 64,682  
Investments in warrants to purchase common stock   3,260
Accrued capital expenditures $ 1,900 $ 1,283