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Balance Sheet Information - Summary of Certain Significant Amounts Included in Condensed Consolidated Balance Sheet (Detail) - USD ($)
$ in Thousands
Mar. 31, 2021
Sep. 30, 2020
Expendable parts and supplies, net:    
Expendable parts and supplies $ 27,324 $ 27,431
Less: obsolescence and other (4,280) (4,460)
Expendable parts and supplies, net 23,044 22,971
Prepaid expenses and other current assets:    
Deferred offering and reimbursed costs   1,261
Other 8,956 14,806
Prepaid expenses and other current assets 8,956 16,067
Property and equipment, net:    
Property and equipment-gross 1,613,445 1,606,117
Less: accumulated depreciation (432,761) (393,702)
Property and equipment-net 1,180,684 1,212,415
Other Assets:    
Warrants 16,374  
Other 4,273  
Other Assets 20,647 742
Other accrued expenses:    
Accrued property taxes 5,996 11,354
Accrued interest 2,480 3,268
Accrued vacation 5,718 5,975
Other 14,416 24,881
Other accrued expenses 28,610 45,478
Aircraft and Other Flight Equipment Substantially Pledged [Member]    
Property and equipment, net:    
Property and equipment-gross 1,603,377 1,596,174
Other Machinery and Equipment [Member]    
Property and equipment, net:    
Property and equipment-gross 5,189 5,147
Leasehold Improvements [Member]    
Property and equipment, net:    
Property and equipment-gross 2,763 2,763
Vehicles [Member]    
Property and equipment, net:    
Property and equipment-gross 1,114 1,032
Building [Member]    
Property and equipment, net:    
Property and equipment-gross 699 699
Furniture and Fixtures [Member]    
Property and equipment, net:    
Property and equipment-gross $ 303 $ 302