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Condensed Consolidated Statements of Cash Flows - USD ($)
 6 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Cash flows from operating activities:    
Net income $ 19,807,000 $ 12,670,000
Adjustments to reconcile net income to net cash flows provided by operating activities:    
Depreciation and amortization 41,175,000 41,021,000
Stock compensation expense 1,658,000 2,513,000
Deferred income taxes 6,654,000 4,490,000
Amortization of deferred credits (2,258,000) (2,041,000)
Amortization of debt discount and issuance costs 4,994,000 2,149,000
Gain on extinguishment of debt (950,000)  
Loss on disposal of assets 25,000 514,000
Provision for obsolete expendable parts and supplies 22,000 306,000
Lease termination 4,508,000  
Changes in assets and liabilities:    
Receivables (155,000) 9,019,000
Expendable parts and supplies (84,000) (1,382,000)
Prepaid expenses and other current assets (1,988,000) 97,000
Accounts payable 15,470,000 (602,000)
Deferred revenue 10,099,000  
Accrued liabilities (14,091,000) 2,122,000
Change in operating lease right-of- use assets (6,311,000) (5,674,000)
Net cash provided by operating activities 78,575,000 65,202,000
Cash flows from investing activities:    
Capital expenditures (5,261,000) (12,968,000)
Net returns (payments) on equipment & other deposits (6,414,000) (11,805,000)
Net cash used in investing activities (11,675,000) (24,773,000)
Cash flows from financing activities:    
Proceeds from long-term debt 195,000,000 23,000,000
Principal payments on long-term debt and financing leases (212,020,000) (79,395,000)
Payments of debt and warrant issuance (1,326,000) (494,000)
Repurchase of stock (176,000) (201,000)
Net cash used in financing activities (18,522,000) (57,090,000)
Net change in cash, cash equivalents and restricted cash 48,378,000 (16,661,000)
Cash, cash equivalents and restricted cash at beginning of period 102,841,000 72,501,000
Cash, cash equivalents and restricted cash at end of period 151,219,000 55,840,000
Supplemental cash flow information    
Cash paid for interest 16,922,000 22,402,000
Cash paid for income taxes, net 49,000 45,000
Operating lease payments in operating cash flows 25,716,000 26,240,000
Supplemental non-cash transactions    
Warrants received from Archer Aviation Inc. ("Archer") 16,400  
Right-of-use assets (disposed) obtained (320,000) 145,627,000
Debt issuance cost related to loan agreement with US Department of Treasury $ (1,887,000)  
Accrued capital expenditures   $ 98,000