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Condensed Consolidated Statements of Cash Flows - USD ($)
$ in Thousands
 9 Months Ended
Jun. 30, 2023
Jun. 30, 2022
Cash flows from operating activities:    
Net loss $ (91,771) $ (67,042)
Adjustments to reconcile net loss to net cash flows provided by (used in) operating activities:    
Depreciation and amortization 47,060 61,878
Stock compensation expense 1,912 2,106
(Gain)/Loss on investments, net (3,275) 12,649
Deferred income taxes (6,157) (19,137)
Amortization of deferred credits 1,407 (639)
Amortization of debt discount and issuance costs and accretion of interest into long-term debt 4,922 8,151
Asset impairment 50,951 39,475
Gain on sale of assets (7,271)  
Other 1,973 764
Changes in assets and liabilities:    
Receivables 396 (883)
Expendable parts and supplies (2,016) (2,418)
Prepaid expenses and other operating assets and liabilities 125 (1,519)
Accounts payable (6,349) 4,367
Deferred heavy maintenance, net (1,382) (4,536)
Deferred revenue (1,342) (11,780)
Accrued expenses and other liabilities (5,689) (10,949)
Operating lease right-of-use assets and liabilities 2,669 3,097
Net cash provided by (used in) operating activities (13,837) 13,584
Cash flows from investing activities:    
Capital expenditures (31,619) (33,230)
Investments in equity securities   (200)
Proceeds from sale of aircraft and engines 139,878  
Refund (payment) of equipment and other deposits 740 (6,954)
Net cash provided by (used in) investing activities 108,999 (40,384)
Cash flows from financing activities:    
Proceeds from long-term debt 39,000 35,311
Proceeds from issuance of common stock under ESPP 148 239
Principal payments on long-term debt and finance leases (142,577) (71,993)
Payments of debt and warrant issuance costs (917) (2,414)
Payment of tax withholding for RSUs (346) (414)
Net cash used in financing activities (104,692) (39,271)
Net change in cash, cash equivalents and restricted cash (9,530) (66,071)
Cash, cash equivalents and restricted cash at beginning of period 61,025 123,867
Cash, cash equivalents and restricted cash at end of period 51,495 57,796
Supplemental cash flow information    
Cash paid for interest 28,801 14,695
Cash paid for income taxes , net 27 442
Operating lease payments in operating cash flows 8,203 31,069
Supplemental non-cash operating activities    
Right-of-use assets obtained in exchange for lease liabilities 755 5,481
Supplemental non-cash financing activities    
Finance lease obtained in exchange for lease liability $ 65,094  
Investments in warrants to purchase common stock   3,260
Accrued capital expenditures   $ 1,407