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Organization and Operations - Additional Information (Detail)
$ / shares in Units, $ in Thousands
 1 Months Ended 3 Months Ended 6 Months Ended 12 Months Ended
Apr. 04, 2025
USD ($)
$ / shares
shares
Apr. 03, 2025
USD ($)
ENGINE
AIRFRAMES
Apr. 01, 2025
USD ($)
AIRCRAFT
Mar. 18, 2025
Feb. 25, 2025
AIRCRAFT
Dec. 31, 2024
USD ($)
AIRCRAFT
Dec. 24, 2024
USD ($)
AIRFRAMES
Dec. 23, 2024
USD ($)
Oct. 01, 2024
USD ($)
AIRFRAMES
AIRCRAFT
Sep. 25, 2024
USD ($)
AIRCRAFT
Jan. 19, 2024
AIRCRAFT
Dec. 20, 2019
AIRCRAFT
Jan. 31, 2024
AIRCRAFT
Mar. 31, 2025
USD ($)
DAILYDEPARTURE
AIRFRAMES
STATE
AIRCRAFT
$ / shares
Dec. 31, 2024
USD ($)
Mar. 31, 2024
USD ($)
Dec. 31, 2023
USD ($)
Mar. 31, 2025
USD ($)
DAILYDEPARTURE
AIRCRAFT
CITY
STATE
$ / shares
Mar. 31, 2024
USD ($)
Sep. 30, 2024
USD ($)
DAILYDEPARTURE
AIRCRAFT
CITY
STATE
$ / shares
Sep. 30, 2023
USD ($)
$ / shares
Sep. 30, 2022
USD ($)
Dec. 30, 2024
USD ($)
Jul. 16, 2024
USD ($)
Mar. 15, 2024
USD ($)
Organization Consolidation And Presentation Of Financial Statements [Line Items]                                                  
Number of states in which entity operates | STATE                           34       34   34          
Number of aircrafts operated | AIRCRAFT                                       67          
Number of cities in which entity operates | CITY                                   82   67          
Number of daily departures | DAILYDEPARTURE                           238       238   265          
Net Income                           $ (58,631) $ (114,558) $ 11,660 $ (57,850) $ (173,188) $ (46,190) $ (91,015) $ (120,116) $ (182,678)      
Impairment of Long-Lived Assets to be Disposed of                           12,400           73,700 50,600 62,100      
Long-term debt                           98,600       98,600   50,500          
Increase in block hour rate percentage 3.00%                                                
Purcahse of aircraft                                   4,307 $ 13,192 20,313 36,641 $ 40,814      
Outstanding principal amount                           $ 130,255       $ 130,255   $ 310,271 $ 528,278        
Wind-down and associated cost                                                 $ 1,000
Common stock, no par value | $ / shares                           $ 0       $ 0   $ 0 $ 0        
Consideration For Amended Description                           Additionally, in January 2023, in consideration for entering in the Amended and Restated United CPA and providing the revolving line of credit, discussed in Note 8, the Company (i) granted United the right to designate one individual to the Company’s board of directors (the “United Designee”), which occurred effective May 2, 2023 with the appointment of Jonathan Ireland and (ii) issued to United 4,042,061 shares of the Company’s common stock equal to approximately 10% of the Company’s issued and outstanding capital stock on such date (the “United Shares”). United’s board designee rights will terminate at such time as United’s equity ownership in the Company falls below five percent (5%) of the Company’s issued and outstanding stock                      
United capacity purchase agreement termination notice period                                   30 days   30 days          
Subsequent Event [Member]                                                  
Organization Consolidation And Presentation Of Financial Statements [Line Items]                                                  
Increase in block hour rate percentage 3.00%                                                
Subsequent Event [Member] | Merger Agreement with Republic Airways Holdings, Inc. [Member]                                                  
Organization Consolidation And Presentation Of Financial Statements [Line Items]                                                  
Common stock , par value | $ / shares $ 0.001                                                
Right to receive shares of common stock | shares 584.9                                                
Common stock, no par value | $ / shares $ 0                                                
Termination fee $ 1,500                                                
Percentage of shares issues at closing of merger 6.00%                                                
United Revolving Credit Facility [Member]                                                  
Organization Consolidation And Presentation Of Financial Statements [Line Items]                                                  
Revolving loan                   $ 12,400       $ 12,400       $ 12,400              
United Revolving Credit Facility [Member] | Subsequent Event [Member]                                                  
Organization Consolidation And Presentation Of Financial Statements [Line Items]                                                  
Loan balance forgiven                                             $ 4,500    
UST Loan [Member]                                                  
Organization Consolidation And Presentation Of Financial Statements [Line Items]                                                  
Outstanding principal amount                                       $ 113,700          
UST Loan [Member] | Subsequent Event [Member]                                                  
Organization Consolidation And Presentation Of Financial Statements [Line Items]                                                  
Minimum collateral coverage ratio               1.55                                  
United Capacity Purchase Agreement [Member]                                                  
Organization Consolidation And Presentation Of Financial Statements [Line Items]                                                  
Minimum liquidity requirement of cash and cash equivalents                                               $ 15,000  
Reimbursement of transition expenses                 $ 14,000                                
United Capacity Purchase Agreement [Member] | Subsequent Event [Member]                                                  
Organization Consolidation And Presentation Of Financial Statements [Line Items]                                                  
Reimbursement of transition expenses     $ 14,000                                            
Maximum [Member] | United Capacity Purchase Agreement [Member]                                                  
Organization Consolidation And Presentation Of Financial Statements [Line Items]                                                  
Number of aircrafts operated | AIRCRAFT                                   60   67          
Minimum [Member] | UST Loan [Member]                                                  
Organization Consolidation And Presentation Of Financial Statements [Line Items]                                                  
Minimum collateral coverage ratio       0.91       0.99                                  
Minimum [Member] | UST Loan [Member] | Subsequent Event [Member]                                                  
Organization Consolidation And Presentation Of Financial Statements [Line Items]                                                  
Minimum collateral coverage ratio       0.91       0.99                                  
CRJ-700 Aircraft [Member]                                                  
Organization Consolidation And Presentation Of Financial Statements [Line Items]                                                  
Number of aircraft sold | AIRCRAFT                 2                                
CRJ-700 Aircraft [Member] | United Capacity Purchase Agreement [Member]                                                  
Organization Consolidation And Presentation Of Financial Statements [Line Items]                                                  
Purcahse of aircraft                   11,000                              
Payment of outstanding obligations                   $ 4,500                              
Number of aircrafts purchased | AIRCRAFT                   2                              
CRJ-900 Aircraft [Member] | United Capacity Purchase Agreement [Member]                                                  
Organization Consolidation And Presentation Of Financial Statements [Line Items]                                                  
Number of aircrafts operated | AIRCRAFT                                       12          
Number of aircrafts to be removed | AIRCRAFT         12                             14          
CRJ-900 Covered Aircraft [Member] | United Capacity Purchase Agreement [Member]                                                  
Organization Consolidation And Presentation Of Financial Statements [Line Items]                                                  
Number of aircrafts to be removed | AIRCRAFT                     8   8                        
CF34-8C Engines [Member] | Purchase agreement [Member] | UST Loan [Member] | Subsequent Event [Member]                                                  
Organization Consolidation And Presentation Of Financial Statements [Line Items]                                                  
Expected gross proceeds from sale of asset   $ 16,300                                              
Number of aircraft classified as assets held for sale | ENGINE   23                                              
CRJ-900 Airframes [Member]                                                  
Organization Consolidation And Presentation Of Financial Statements [Line Items]                                                  
Number of aircraft classified as assets held for sale | AIRFRAMES                           3                      
CRJ-900 Airframes [Member] | Purchase agreement [Member] | UST Loan [Member] | Subsequent Event [Member]                                                  
Organization Consolidation And Presentation Of Financial Statements [Line Items]                                                  
Expected gross proceeds from sale of asset   $ 9,100         $ 19,000                                    
Total expected gross proceeds from sale of productive assets   $ 28,100                                              
Number of aircraft classified as assets held for sale | AIRFRAMES   14         15                                    
CRJ-900 Airframes [Member] | Aircraft Purchase Agreement [Member] | Subsequent Event [Member]                                                  
Organization Consolidation And Presentation Of Financial Statements [Line Items]                                                  
Number of aircraft sold | AIRFRAMES                 4                                
E-175 Aircraft [Member]                                                  
Organization Consolidation And Presentation Of Financial Statements [Line Items]                                                  
Number of aircrafts operated | AIRCRAFT                                   60              
Net Income                                   $ (54,400)              
Number of aircraft sold | AIRCRAFT                           18                      
E-175 Aircraft [Member] | Subsequent Event [Member]                                                  
Organization Consolidation And Presentation Of Financial Statements [Line Items]                                                  
Number of aircraft sold | AIRCRAFT                 2                                
E-175 Aircraft [Member] | United Capacity Purchase Agreement [Member]                                                  
Organization Consolidation And Presentation Of Financial Statements [Line Items]                                                  
Number of aircrafts operated | AIRCRAFT                                   60   55          
Number of aircrafts to be removed | AIRCRAFT                                       18          
E-175 Aircraft [Member] | Aircraft Purchase Agreement [Member] | Subsequent Event [Member]                                                  
Organization Consolidation And Presentation Of Financial Statements [Line Items]                                                  
Number of aircraft sold | AIRCRAFT           18                                      
Expected gross proceeds from sale of asset           $ 227,700                                      
Expected proceeds from sale of asset           $ 84,700                                      
Number of aircraft classified as assets held for sale | AIRCRAFT                 18                                
Boeing 737400F [Member] | DHL Flight Services Agreement [Member]                                                  
Organization Consolidation And Presentation Of Financial Statements [Line Items]                                                  
Number of aircrafts operated | AIRCRAFT                       4                          
United Airlines Inc [Member] | E-175 Aircraft [Member]                                                  
Organization Consolidation And Presentation Of Financial Statements [Line Items]                                                  
Pilot training costs               $ 14,000                                  
United Airlines Inc [Member] | E-175 Aircraft [Member] | United Capacity Purchase Agreement [Member]                                                  
Organization Consolidation And Presentation Of Financial Statements [Line Items]                                                  
Number of aircrafts operated | AIRCRAFT                                       42          
Lease expiration year                                       2028          
Number of aircrafts owned | AIRCRAFT                                       18          
Notice period for termination of agreement                                   United, subject to certain conditions, including the payment of certain costs tied to aircraft type, to terminate the agreement in its discretion, or remove aircraft from service, by giving us notice of 90 days or more   United, subject to certain conditions, including the payment of certain costs tied to aircraft type, to terminate the agreement in its discretion, or remove aircraft from service, by giving us notice of 90 days or more.          
United Airlines Inc [Member] | E-175 Aircraft [Member] | Maximum [Member] | United Capacity Purchase Agreement [Member]                                                  
Organization Consolidation And Presentation Of Financial Statements [Line Items]                                                  
Lease expiration year                                   2028   2028          
United Airlines Inc [Member] | E-175 Aircraft [Member] | Minimum [Member] | United Capacity Purchase Agreement [Member]                                                  
Organization Consolidation And Presentation Of Financial Statements [Line Items]                                                  
Lease expiration year                                   2026   2024          
United Airlines Inc [Member] | CRJ-900 and E-175 Aircraft [Member] | United Capacity Purchase Agreement [Member]                                                  
Organization Consolidation And Presentation Of Financial Statements [Line Items]                                                  
Number of combined fleet | AIRCRAFT                 60                                
United Airlines Inc [Member] | CRJ-900 and E-175 Aircraft [Member] | United Capacity Purchase Agreement [Member] | Subsequent Event [Member]                                                  
Organization Consolidation And Presentation Of Financial Statements [Line Items]                                                  
Number of combined fleet | AIRCRAFT     60                                            
United Airlines Inc [Member] | E175LL Aircraft [Member] | United Capacity Purchase Agreement [Member]                                                  
Organization Consolidation And Presentation Of Financial Statements [Line Items]                                                  
Notice period for termination of agreement                                   United, subject to certain conditions, including the payment of certain costs tied to aircraft type, may terminate the agreement in its discretion, or remove E-175 aircraft from service, by giving us notice of 90 days or more   United, subject to certain conditions, including the payment of certain costs tied to aircraft type, may terminate the agreement in its discretion, or remove E-175 aircraft from service, by giving us notice of 90 days or more          
Decrease in Scheduled Flying Activity [Member]                                                  
Organization Consolidation And Presentation Of Financial Statements [Line Items]                                                  
Net Income                                   $ 173,200   $ (91,000)          
Impairment of Long-Lived Assets to be Disposed of                                       $ 73,700          
Decrease in Scheduled Flying Activity [Member] | E-175 Aircraft [Member]                                                  
Organization Consolidation And Presentation Of Financial Statements [Line Items]                                                  
Impairment of Long-Lived Assets to be Disposed of                                   $ 111,800              
Number of aircraft sold | AIRCRAFT                                   18