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Organization and Operations - Additional Information (Detail)
 1 Months Ended 2 Months Ended 9 Months Ended
Mar. 04, 2021
Air-craft
Nov. 19, 2020
Air-craft
Nov. 04, 2020
Air-craft
Dec. 20, 2019
Air-craft
Nov. 26, 2019
Air-craft
Airfleet
Jun. 30, 2021
Daily_Departure
State
Air-craft
Jun. 02, 2021
Air-craft
Aug. 17, 2021
Air-craft
May 05, 2021
Air-craft
Mar. 03, 2021
Air-craft
Jun. 30, 2021
Daily_Departure
State
Air-craft
City
Employee
Organization Consolidation And Presentation Of Financial Statements [Line Items]                      
Number of states in which entity operates | State           36         36
Number of aircrafts operated                     155
Number of cities in which entity operates | City                     116
Number of daily departures | Daily_Departure           470         470
Number of employees | Employee                     3,191
Aircraft leases to third party                     12
American Capacity Purchase Agreement [Member]                      
Organization Consolidation And Presentation Of Financial Statements [Line Items]                      
Amendment Term   5 years                  
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Aircrafts able to be withdrawn in future under normal withdrawal rights   20                  
Aircrafts able to be withdrawn in future, thereafter under normal withdrawal rights   20                  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                 45
Amended and Restated American Capacity Purchase Agreement [Member]                      
Organization Consolidation And Presentation Of Financial Statements [Line Items]                      
Number of aircrafts withdrawable on conditions           1         1
Amended and Restated American Capacity Purchase Agreement [Member] | CRJ-900 Aircraft [Member]                      
Organization Consolidation And Presentation Of Financial Statements [Line Items]                      
Number of aircrafts expected to operate 5                 3  
American Capacity Purchase Agreement (Amendment No. 2) [Member] | CRJ-900 Aircraft [Member]                      
Organization Consolidation And Presentation Of Financial Statements [Line Items]                      
Number of aircrafts expected to operate             3   5    
American Capacity Purchase Agreement (Amendment No. 2) [Member] | CRJ-900 Aircraft [Member] | Forecast                      
Organization Consolidation And Presentation Of Financial Statements [Line Items]                      
Number of aircrafts expected to operate               5      
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
Aircraft lease extension period         5 years            
Number of aircraft leased         42            
Lease expiration year         2028            
Number of aircrafts owned | Airfleet         18            
Notice period for termination of agreement                     Permits United, subject to certain conditions, including the payment of certain costs tied to aircraft type, to 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
Number of additional aircrafts         20            
Number of years in operation         12 years            
Air crafts expiring month and year description                     expiring between November 2032 and June 2033
Number of aircraft leased     20                
Aircraft lease term     12 years                
Number of aircraft delivered           20          
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]                      
Aircraft lease term         9 years            
DHL Flight Services Agreement [Member] | Boeing 737400F [Member]                      
Organization Consolidation And Presentation Of Financial Statements [Line Items]                      
Number of aircrafts operated       2              
Number of aircraft leased       2              
Aircraft lease term       5 years              
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 day’s 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.