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Organization and Operations - Additional Information (Detail)
 6 Months Ended
Dec. 20, 2019
Air-craft
Mar. 31, 2022
Daily_Departure
State
Air-craft
City
Employee
Organization Consolidation And Presentation Of Financial Statements [Line Items]    
Number of states in which entity operates | State   40
Number of aircrafts operated   168
Number of cities in which entity operates | City   110
Number of daily departures | Daily_Departure   349
Number of employees | Employee   2,800
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Aircrafts able to be withdrawn in future under normal withdrawal rights   20
Aircrafts able to be withdrawn in future, thereafter under normal withdrawal rights   20
American Capacity Purchase Agreement [Member] | CRJ-900 Aircraft [Member]    
Organization Consolidation And Presentation Of Financial Statements [Line Items]    
Number of aircrafts operated   40
United Capacity Purchase Agreement [Member] | E-175 Aircraft [Member]    
Organization Consolidation And Presentation Of Financial Statements [Line Items]    
Number of aircrafts operated   60
United Capacity Purchase Agreement [Member] | E-175 Aircraft [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
United Capacity Purchase Agreement [Member] | E-175 Aircraft [Member] | United [Member] | Minimum [Member]    
Organization Consolidation And Presentation Of Financial Statements [Line Items]    
Lease expiration year   2024
United Capacity Purchase Agreement [Member] | E-175 Aircraft [Member] | United [Member] | Maximum [Member]    
Organization Consolidation And Presentation Of Financial Statements [Line Items]    
Lease expiration year   2028
United Capacity Purchase Agreement [Member] | E175LL Aircraft [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
United Capacity Purchase Agreement [Member] | E175LL Aircraft [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
United Capacity Purchase Agreement [Member] | CRJ-700 Aircraft [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   18
DHL Flight Services Agreement [Member] | Boeing 737400F [Member]    
Organization Consolidation And Presentation Of Financial Statements [Line Items]    
Number of aircrafts operated 2  
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.