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Balance Sheet Information - Summary of Certain Significant Amounts Included in Condensed Consolidated Balance Sheet (Detail) - USD ($)
$ in Thousands
Jun. 30, 2021
Sep. 30, 2020
Expendable parts and supplies, net:    
Expendable parts and supplies $ 29,135 $ 27,431
Less: obsolescence and other (4,428) (4,460)
Expendable parts and supplies, net 24,707 22,971
Prepaid expenses and other current assets:    
Deferred offering and reimbursed costs   1,261
Prepaid aviation insurance 4,662 2,396
Other 4,294 12,410
Prepaid expenses and other current assets 8,956 16,067
Property and equipment, net:    
Property and equipment-gross 1,616,298 1,606,117
Less: accumulated depreciation (452,105) (393,702)
Property and equipment-net 1,164,193 1,212,415
Other assets:    
Warrants 16,374  
Other 8,941 742
Other assets 25,315 742
Other accrued expenses:    
Accrued property taxes 7,479 11,354
Accrued interest 4,814 3,268
Accrued vacation 5,967 5,975
Deferred PSP payments 26,100 11,311
Other 15,092 13,570
Other accrued expenses 59,452 45,478
Aircraft and Other Flight Equipment Substantially Pledged [Member]    
Property and equipment, net:    
Property and equipment-gross 1,606,276 1,596,174
Other Machinery and Equipment [Member]    
Property and equipment, net:    
Property and equipment-gross 5,116 5,147
Leasehold Improvements [Member]    
Property and equipment, net:    
Property and equipment-gross 2,790 2,763
Vehicles [Member]    
Property and equipment, net:    
Property and equipment-gross 1,115 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 $ 302 $ 302