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Organization and Operations - Additional Information (Detail)
 1 Months Ended 2 Months Ended 6 Months Ended
Mar. 31, 2021
Daily_Departure
State
Air-craft
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. 02, 2021
Air-craft
Aug. 17, 2021
Air-craft
May 05, 2021
Air-craft
Mar. 03, 2021
Air-craft
Mar. 31, 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 38                   38
Number of aircrafts operated                     163
Number of cities in which entity operates | City                     112
Number of daily departures | Daily_Departure 440                   440
Number of employees | Employee                     3,111
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                
Number of aircraft removed due to failure to meet certain performance objectives     20                
Number of aircraft removed due to failure to meet certain performance objectives thereafter     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] | 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] | Scenario Forecast [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] | Subsequent Event [Member]                      
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                     16
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 16                    
Number of aircraft expected to delivered 4                    
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-175LL 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 under after the first anniversary of the commencement date of Aircraft 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.