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Consolidated Statements of Operations and Comprehensive (Loss) Income - USD ($)
shares in Thousands, $ in Thousands
 12 Months Ended
Sep. 30, 2024
Sep. 30, 2023
Sep. 30, 2022
Operating revenues:      
Contract revenue $ 476,409 $ 498,065 $ 531,001
Operating expenses:      
Flight operations 184,472 216,748 177,038
Maintenance 184,725 199,648 201,930
Aircraft rent 7,797 6,200 36,989
General and administrative 44,248 48,765 43,966
Depreciation and amortization 40,041 60,359 81,508
Asset impairment 73,709 54,343 171,824
Loss/(Gain) on sale of assets 682 (7,162) (4,723)
Other operating expenses 6,555 3,510 7,471
Total operating expenses 542,229 582,411 716,003
Operating loss (65,820) (84,346) (185,002)
Other income (expense), net:      
Interest expense (38,455) (49,921) (35,289)
Interest income 68 146 139
Gain on investments, net 8,032    
Unrealized (loss)/gain on investments, net (6,145) 5,408 (13,715)
Gain on extinguishment of debt 2,954 (1,505) (397)
Gain on debt forgiveness 10,500    
Other expense, net (1,630) (148) (801)
Total other expense, net (24,676) (44,515) (49,666)
Loss before taxes (90,496) (128,861) (234,668)
Income tax expense/(benefit) 519 (8,745) (51,990)
Net loss and comprehensive loss $ (91,015) $ (120,116) $ (182,678)
Net loss per share attributable to common shareholders      
Basic $ (2.21) $ (3.04) $ (5.06)
Diluted $ (2.21) $ (3.04) $ (5.06)
Weighted-average common shares outstanding      
Basic 41,137 39,465 36,133
Diluted 41,137 39,465 36,133
Contract Revenue      
Operating revenues:      
Contract revenue $ 404,322 $ 421,298 $ 478,482
Pass Through and Other Revenue      
Operating revenues:      
Contract revenue $ 72,087 $ 76,767 $ 52,519