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Organization and Operations - Additional Information (Detail)
$ in Thousands
 9 Months Ended
Dec. 20, 2019
Air-craft
Jun. 30, 2022
USD ($)
Daily_Departure
Air-craft
State
City
Employee
Sep. 30, 2021
USD ($)
Organization Consolidation And Presentation Of Financial Statements [Line Items]      
Number of aircrafts listed for sale   12  
Number of states in which entity operates | State   41  
Number of aircrafts operated   168  
Number of cities in which entity operates | City   121  
Number of daily departures | Daily_Departure   360  
Number of employees | Employee   2,600  
Principal maturity payments on long-term debt due within next twelve months | $   $ 112,776 $ 111,710
Number of aircrafts withdrawable on conditions   1  
United capacity purchase agreement termination notice period   30 days  
American Capacity Purchase Agreement [Member]      
Organization Consolidation And Presentation Of Financial Statements [Line Items]      
Maximum number of aircraft withdraw in twenty twenty one   10  
Maximum number of aircraft withdraw in twenty twenty two   5  
Maximum number of aircraft withdraw in twenty twenty three   5  
Aircrafts able to be withdrawn in future under normal withdrawal rights   20  
Aircrafts able to be withdrawn in future, thereafter under normal withdrawal rights   20  
CRJ-700 Aircraft [Member]      
Organization Consolidation And Presentation Of Financial Statements [Line Items]      
Number of aircrafts agreed to sell   18  
CRJ-700 Aircraft [Member] | United Capacity Purchase Agreement [Member] | United [Member]      
Organization Consolidation And Presentation Of Financial Statements [Line Items]      
Number of aircrafts operated   20  
Aircraft lease term   9 years  
Number of aircraft leased   20  
CRJ-900 Aircraft [Member] | American Capacity Purchase Agreement [Member]      
Organization Consolidation And Presentation Of Financial Statements [Line Items]      
Number of aircrafts operated   40  
E-175 Aircraft [Member] | United Capacity Purchase Agreement [Member]      
Organization Consolidation And Presentation Of Financial Statements [Line Items]      
Number of aircrafts operated   60  
E-175 Aircraft [Member] | United Capacity Purchase Agreement [Member] | United [Member]      
Organization Consolidation And Presentation Of Financial Statements [Line Items]      
Number of aircrafts operated   42  
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, may terminate the agreement in its discretion, or remove E-175 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]      
Organization Consolidation And Presentation Of Financial Statements [Line Items]      
Number of aircrafts operated   20  
Air crafts expiring month and year description   expiring between 2032 and 2033  
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   Commencing five (5) years after the actual in-service date, United has the right to remove the E-175 aircraft from service by giving us notice of 90 days or more, subject to certain conditions, including the payment of certain wind-down expenses plus, if removed prior to the ten (10) year anniversary of the in-service date, certain accelerated margin payments  
Boeing 737400F [Member] | DHL Flight Services Agreement [Member]      
Organization Consolidation And Presentation Of Financial Statements [Line Items]      
Number of aircrafts operated 3    
Aircraft lease term 5 years    
Number of aircraft leased 2    
Notice period for termination of agreement   At any time after the first anniversary of the commencement date of the first aircraft placed in service with 90 days’ written notice  
Aircraft option to extend agreement description   DHL has the option to extend the agreement with respect to one or more aircraft for a period of one year with 90 days’ advance written notice.