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Long-Term Debt, Finance Leases, and Other Borrowings - Additional Information (Detail)
 1 Months Ended 2 Months Ended 3 Months Ended 6 Months Ended 9 Months Ended 12 Months Ended
Mar. 18, 2025
Dec. 23, 2024
Nov. 23, 2024
Oct. 01, 2024
USD ($)
Jul. 01, 2024
USD ($)
Jan. 11, 2024
USD ($)
Sep. 06, 2023
USD ($)
Dec. 27, 2022
USD ($)
Oct. 30, 2020
USD ($)
$ / shares
shares
Dec. 31, 2015
USD ($)
Nov. 22, 2024
Mar. 31, 2025
USD ($)
$ / shares
Mar. 31, 2025
USD ($)
$ / shares
Jun. 30, 2023
USD ($)
Sep. 30, 2024
USD ($)
$ / shares
Jul. 16, 2024
USD ($)
Sep. 30, 2023
USD ($)
Dec. 31, 2020
USD ($)
Nov. 14, 2020
USD ($)
Nov. 13, 2020
USD ($)
Debt Instrument [Line Items]                                        
Property and equipment, net                       $ 36,846,000 $ 36,846,000   $ 426,351,000   $ 698,022,000      
Long-Term Debt                       130,255,000 130,255,000   310,271,000   528,278,000      
Debt outstanding                       $ 131,678,000 $ 131,678,000   $ 315,210,000   538,300,000      
Warrants of common stock exercise price | $ / shares                       $ 3.98 $ 3.98   $ 3.98          
Principal payments                             $ 23,300,000          
Property and equipment-gross                       $ 75,247,000 $ 75,247,000   600,924,000   $ 1,049,203,000      
E175 Aircraft [Member]                                        
Debt Instrument [Line Items]                                        
Remaining Balance                   $ 73,400,000                    
Subsequent Event [Member]                                        
Debt Instrument [Line Items]                                        
Remaining Balance       $ 73,400,000                                
Treasury Loan [Member]                                        
Debt Instrument [Line Items]                                        
Debt outstanding                             113,700,000          
Principal payments                             25,400,000          
Treasury Loan [Member] | Subsequent Event [Member]                                        
Debt Instrument [Line Items]                                        
Minimum collateral coverage ratio covenant     1.55               1.44                  
Treasury Loan [Member] | Maximum [Member]                                        
Debt Instrument [Line Items]                                        
Calculated collateral coverage ratio                 1.55                      
Treasury Loan [Member] | Minimum [Member]                                        
Debt Instrument [Line Items]                                        
Additional collateral coverage ratio                 1.55                      
Loan Agreement [Member]                                        
Debt Instrument [Line Items]                                        
Secured term loan facility, amount borrowed                 $ 43,000,000                      
Secured term loan facility, additional amount borrowed                                       $ 152,000,000
Warrants to purchase shares of common stock | shares                 4,899,497                      
Warrants of common stock exercise price | $ / shares                 $ 3.98                      
Debt issuance costs allocated to warrants                             100,000          
Loan Agreement [Member] | EDC Loans [Member]                                        
Debt Instrument [Line Items]                                        
Debt issuance costs                                       3,100,000
Loan Agreement [Member] | FortyThreeMillionTreasuryLoanMember                                        
Debt Instrument [Line Items]                                        
Capitalized debt issuance costs, net                 $ 700,000                      
Loan Agreement [Member] | $152M Treasury Loan [Member]                                        
Debt Instrument [Line Items]                                        
Capitalized debt issuance costs, net                                       2,300,000
Revolving Credit Facility [Member]                                        
Debt Instrument [Line Items]                                        
Repayments of long term debt           $ 2,100,000                            
Permitted amount to redraw from existing credit facility             $ 7,900,000                          
Revolving Credit Facility [Member] | Maximum [Member]                                        
Debt Instrument [Line Items]                                        
Revolving commitments             50,700,000                          
Revolving Credit Facility [Member] | Minimum [Member]                                        
Debt Instrument [Line Items]                                        
Revolving commitments             $ 30,700,000                          
Equipment Notes [Member]                                        
Debt Instrument [Line Items]                                        
Long-Term Debt                             85,500,000          
Secured Term Loan Facility [Member] | Loan Agreement [Member]                                        
Debt Instrument [Line Items]                                        
Secured term loan facility, maximum borrowing capacity                 200,000,000                      
Secured Term Loan Facility [Member] | Loan Agreement [Member] | Treasury Loan [Member]                                        
Debt Instrument [Line Items]                                        
Secured term loan facility, amount borrowed                 $ 43,000,000                 $ 195,000,000    
Secured term loan facility, additional amount borrowed                                     $ 0 $ 152,000,000
Debt instrument, maturity date                 Oct. 30, 2025                      
Long term debt, basis spread on variable rate                 3.50%                      
Percentage of all in rate                       8.06% 8.06%              
UST Loan [Member]                                        
Debt Instrument [Line Items]                                        
Long-Term Debt                             $ 113,700,000          
UST Loan [Member] | Subsequent Event [Member]                                        
Debt Instrument [Line Items]                                        
Minimum Collateral Coverage Ratio 1   1.55                                    
UST Loan [Member] | Minimum [Member]                                        
Debt Instrument [Line Items]                                        
Minimum Collateral Coverage Ratio 1 0.91 0.99                                    
UST Loan [Member] | Minimum [Member] | Subsequent Event [Member]                                        
Debt Instrument [Line Items]                                        
Minimum Collateral Coverage Ratio 1 0.91 0.99                                    
United Capacity Purchase Agreement [Member]                                        
Debt Instrument [Line Items]                                        
Repayments of long term debt           $ 10,500,000                            
Minimum liquidity requirement of cash and cash equivalents                               $ 15,000,000        
United Capacity Purchase Agreement [Member] | United Airlines Inc [Member]                                        
Debt Instrument [Line Items]                                        
Percentage of controllable completion factor                         99.30%   99.30%          
United Capacity Purchase Agreement [Member] | Revolving Credit Facility [Member]                                        
Debt Instrument [Line Items]                                        
Repayments of lines of credit                       $ 10,500,000     $ 10,500,000          
Long term debt, basis spread on variable rate             3.50% 3.50%                        
Revolving loan               $ 10,500,000                        
Revolving commitments               30,700,000                        
Covenant capping restricted payments               $ 5,000,000                        
Rental coverage ratio               1                        
United Capacity Purchase Agreement [Member] | Revolving Credit Facility [Member] | SOFR [Member]                                        
Debt Instrument [Line Items]                                        
Long term debt, basis spread on variable rate             4.50% 4.50%                        
United Capacity Purchase Agreement [Member] | Revolving Credit Facility [Member] | United Airlines Inc [Member]                                        
Debt Instrument [Line Items]                                        
Amount funded by company                           $ 25,500,000 25,500,000          
Additional prepayment with potential forgiveness                       15,000,000 $ 15,000,000   15,000,000          
Deemed prepayment, outstanding                       4,500,000 4,500,000   4,500,000          
United Capacity Purchase Agreement [Member] | Revolving Credit Facility [Member] | Minimum [Member]                                        
Debt Instrument [Line Items]                                        
Amount required               $ 15,000,000           $ 15,000,000            
Fee waiver granted on minimum liquidity requirement         $ 15,000,000                              
Aircraft and Equipment [Member] | Pledged as Collateral [Member]                                        
Debt Instrument [Line Items]                                        
Property and equipment, net                             $ 438,400,000          
Property and equipment-gross                       $ 60,400,000 $ 60,400,000