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Balance Sheet Information - Summary of Certain Significant Amounts Included in Consolidated Balance Sheet (Detail) - USD ($)
$ in Thousands
Sep. 30, 2021
Sep. 30, 2020
Expendable parts and supplies, net:    
Expendable parts and supplies $ 29,297 $ 27,431
Less: obsolescence and other (4,830) (4,460)
Expendable parts and supplies, net 24,467 22,971
Prepaid expenses and other current assets:    
Deferred offering and reimbursed costs   1,261
Prepaid aviation insurance 2,171 2,396
Other 4,714 12,410
Prepaid expenses and other current assets 6,885 16,067
Property and equipment, net:    
Property and equipment-gross 1,621,437 1,606,117
Less: accumulated depreciation (469,546) (393,702)
Property and equipment-net 1,151,891 1,212,415
Other assets:    
Investments in equity securities 25,149  
Lease incentives 10,957  
Other 15 742
Other assets 36,121 742
Other accrued expenses:    
Accrued property taxes 8,783 11,354
Accrued interest 2,565 3,268
Accrued vacation 5,936 5,975
Deferred PSP payments   11,311
Other 16,373 13,570
Other accrued expenses 33,657 45,478
Other noncurrent liabilities:    
Warrant liabilities 21,964  
Lease incentive obligations 6,358  
Other 6,269 1,409
Other noncurrent liabilities 34,591 1,409
Aircraft and Other Flight Equipment Substantially Pledged [Member]    
Property and equipment, net:    
Property and equipment-gross 1,611,544 1,596,174
Other Machinery and Equipment [Member]    
Property and equipment, net:    
Property and equipment-gross 4,934 5,147
Leasehold Improvements [Member]    
Property and equipment, net:    
Property and equipment-gross 2,776 2,763
Vehicles [Member]    
Property and equipment, net:    
Property and equipment-gross 1,184 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 $ 300 $ 302