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Organization and Operations - Additional Information (Detail)
$ / shares in Units, $ in Thousands
 1 Months Ended 3 Months Ended 6 Months Ended
Apr. 04, 2025
USD ($)
$ / shares
shares
Apr. 03, 2025
USD ($)
Engine
Airframes
Mar. 18, 2025
Dec. 24, 2024
USD ($)
Airframes
Dec. 23, 2024
USD ($)
Jan. 13, 2023
shares
Jan. 31, 2024
AirCraft
Dec. 31, 2024
USD ($)
DailyDeparture
AirCraft
City
Airframes
State
$ / shares
shares
Dec. 31, 2023
USD ($)
Mar. 31, 2025
USD ($)
AirCraft
Dec. 30, 2024
USD ($)
Sep. 30, 2024
USD ($)
$ / shares
shares
Dec. 27, 2022
USD ($)
Organization Consolidation And Presentation Of Financial Statements [Line Items]                          
Number of states in which entity operates | State               32          
Number of aircrafts operated | AirCraft               60          
Number of cities in which entity operates | City               76          
Number of daily departures | DailyDeparture               228          
Common stock, no par value | $ / shares               $ 0       $ 0  
Net loss               $ (114,558) $ (57,850)        
Impairment loss               3,500          
Current portion of long-term debt               143,275       $ 50,455  
Long-term debt               $ 143,300          
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          
Common stock, shares issued | shares               41,331,719       41,331,719  
Purcahse of aircraft               $ 2,065 $ 6,884        
Decrease in Scheduled Flying Activity [Member]                          
Organization Consolidation And Presentation Of Financial Statements [Line Items]                          
Net loss               (114,600)          
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]                          
Loan balance forgiven                     $ 4,500    
Revolving loan               $ 12,400          
United Capacity Purchase Agreement [Member] | Maximum [Member]                          
Organization Consolidation And Presentation Of Financial Statements [Line Items]                          
Number of aircrafts operated | AirCraft               60          
United Capacity Purchase Agreement [Member] | Subsequent Event [Member]                          
Organization Consolidation And Presentation Of Financial Statements [Line Items]                          
Reimbursement of transition expenses                   $ 14,000      
United Capacity Purchase Agreement [Member] | Revolving Credit Facility [Member]                          
Organization Consolidation And Presentation Of Financial Statements [Line Items]                          
Revolving loan                         $ 10,500
United Capacity Purchase Agreement [Member] | United [Member]                          
Organization Consolidation And Presentation Of Financial Statements [Line Items]                          
Common stock issued equivalent percentage of issued and outstanding capital stock           10.00%              
Common stock, shares issued | shares           4,042,061              
United Capacity Purchase Agreement [Member] | United [Member] | Subsequent Event [Member]                          
Organization Consolidation And Presentation Of Financial Statements [Line Items]                          
Common stock issued equivalent percentage of issued and outstanding capital stock 6.00%                        
CRJ-700 Aircraft [Member] | United Capacity Purchase Agreement [Member] | United [Member]                          
Organization Consolidation And Presentation Of Financial Statements [Line Items]                          
Aircraft lease term               9 years          
CRJ-900 Aircraft [Member]                          
Organization Consolidation And Presentation Of Financial Statements [Line Items]                          
Number of aircrafts operated | AirCraft               6          
CRJ-900 Aircraft [Member] | United Capacity Purchase Agreement [Member]                          
Organization Consolidation And Presentation Of Financial Statements [Line Items]                          
Number of aircrafts operated | AirCraft               6          
E-175 Aircraft [Member]                          
Organization Consolidation And Presentation Of Financial Statements [Line Items]                          
Number of aircrafts operated | AirCraft               54          
Net loss               $ (46,700)          
Impairment loss               $ 60,700          
Number of aircraft sold | AirCraft               10          
E-175 Aircraft [Member] | Decrease in Scheduled Flying Activity [Member]                          
Organization Consolidation And Presentation Of Financial Statements [Line Items]                          
Impairment loss               $ 65,700          
Number of aircraft sold | AirCraft               8          
E-175 Aircraft [Member] | United [Member]                          
Organization Consolidation And Presentation Of Financial Statements [Line Items]                          
Pilot training costs         $ 14,000                
E-175 Aircraft [Member] | United Capacity Purchase Agreement [Member]                          
Organization Consolidation And Presentation Of Financial Statements [Line Items]                          
Number of aircrafts operated | AirCraft               54          
E-175 Aircraft [Member] | United Capacity Purchase Agreement [Member] | United [Member]                          
Organization Consolidation And Presentation Of Financial Statements [Line Items]                          
Number of aircrafts operated | AirCraft               50          
Number of aircrafts owned | AirCraft               10          
Lease expiration year               2028          
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          
E-175 Aircraft [Member] | United Capacity Purchase Agreement [Member] | United [Member] | Minimum [Member]                          
Organization Consolidation And Presentation Of Financial Statements [Line Items]                          
Lease expiration year               2024          
E-175 Aircraft [Member] | United Capacity Purchase Agreement [Member] | United [Member] | Maximum [Member]                          
Organization Consolidation And Presentation Of Financial Statements [Line Items]                          
Lease expiration year               2028          
E175LL Aircraft [Member] | United Capacity Purchase Agreement [Member] | United [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          
CRJ-900 and E-175 Aircraft [Member] | United Capacity Purchase Agreement [Member] | United [Member] | Subsequent Event [Member]                          
Organization Consolidation And Presentation Of Financial Statements [Line Items]                          
Number of combined fleet | AirCraft                   60      
CRJ-900 Airframes [Member]                          
Organization Consolidation And Presentation Of Financial Statements [Line Items]                          
Impairment loss               $ 1,500          
Number of aircraft sold | Airframes               2          
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            
UST Loan [Member]                          
Organization Consolidation And Presentation Of Financial Statements [Line Items]                          
Minimum collateral coverage ratio         1.55                
UST Loan [Member] | Minimum [Member]                          
Organization Consolidation And Presentation Of Financial Statements [Line Items]                          
Minimum collateral coverage ratio         0.99                
UST Loan [Member] | Subsequent Event [Member] | Minimum [Member]                          
Organization Consolidation And Presentation Of Financial Statements [Line Items]                          
Minimum collateral coverage ratio     0.91                    
UST Loan [Member] | Subsequent Event [Member] | Maximum [Member]                          
Organization Consolidation And Presentation Of Financial Statements [Line Items]                          
Minimum collateral coverage ratio     1                    
UST Loan [Member] | CRJ-900 Airframes [Member] | Purchase agreement [Member]                          
Organization Consolidation And Presentation Of Financial Statements [Line Items]                          
Number of aircraft classified as assets held for sale | Airframes       15                  
Expected gross proceeds from sale of asset       $ 19,000                  
UST Loan [Member] | CRJ-900 Airframes [Member] | Subsequent Event [Member] | Purchase agreement [Member]                          
Organization Consolidation And Presentation Of Financial Statements [Line Items]                          
Number of aircraft classified as assets held for sale | Airframes   14                      
Expected gross proceeds from sale of asset   $ 9,100                      
Expected proceeds from sale of asset   $ 28,100                      
UST Loan [Member] | CF34-8C Engines [Member] | Subsequent Event [Member] | Purchase agreement [Member]                          
Organization Consolidation And Presentation Of Financial Statements [Line Items]                          
Number of aircraft classified as assets held for sale | Engine   23                      
Expected gross proceeds from sale of asset   $ 16,300