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Organization and Operations - Additional Information (Detail)
 1 Months Ended 2 Months Ended 3 Months Ended 12 Months Ended 24 Months Ended
Jan. 01, 2022
USD ($)
Air-craft
Dec. 20, 2019
Air-craft
Aug. 31, 2022
Air-craft
Jun. 02, 2021
Air-craft
Aug. 17, 2021
Air-craft
May 05, 2021
Air-craft
Mar. 03, 2021
Air-craft
Sep. 30, 2022
USD ($)
Daily_Departure
State
Air-craft
Sep. 30, 2022
USD ($)
Daily_Departure
State
Air-craft
City
Employee
Engine
FlightHour
Sep. 30, 2021
USD ($)
Sep. 30, 2020
USD ($)
Dec. 31, 2024
USD ($)
Air-craft
Organization Consolidation And Presentation Of Financial Statements [Line Items]                        
Number of states in which entity operates | State               39 39      
Number of aircrafts operated                 158      
Number of cities in which entity operates | City                 107      
Number of daily departures | Daily_Departure               306 306      
Number of employees | Employee                 2,454      
Net cash provided by operating activities | $                 $ 13,362,000 $ 132,871,000 $ 174,662,000  
Net loss | $                 (182,678,000) $ 16,588,000 $ 27,464,000  
Impairment charge | $                 171,824,000      
Proceeds from sale of property | $                 $ 8,200,000      
Number of aircrafts listed for sale | Engine                 30      
Gross proceeds from sale of asset | $                 $ 80,000,000      
Proceeds from sale of asset | $                 26,400,000      
Line of credit | $               $ 25,500,000 25,500,000      
Reduction in loan amount | $                 5,000,000      
Upfront provided for flight time out-of-pocket expense | $                 0      
Short-term debt | $               $ 97,200,000 $ 97,200,000      
Number of aircrafts withdrawable on conditions               1 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Aircrafts able to be withdrawn in future under normal withdrawal rights                 20      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                 42      
Maximum [Member] | Mesa Pilot Development Program [Member]                        
Organization Consolidation And Presentation Of Financial Statements [Line Items]                        
Flight hours required to fly commercial aircraft | FlightHour                 1,500      
RASPRO Aircraft Lease Agreement [Member]                        
Organization Consolidation And Presentation Of Financial Statements [Line Items]                        
Number of aircraft lease terminated                 15      
Buyout pricing | $                 $ 25,000,000      
Scenario Forecast [Member] | Export Development Bank of Canada Agreement [Member]                        
Organization Consolidation And Presentation Of Financial Statements [Line Items]                        
Number of aircrafts operated                       7
Maximum liquidity provided | $                       $ 14,000,000
CRJ-700 Aircraft [Member]                        
Organization Consolidation And Presentation Of Financial Statements [Line Items]                        
Number of aircrafts listed for sale                 18      
Number of aircraft sold                 10      
Number of aircraft to be sold 8                      
Proceeds from sale of property | $ $ 8,000,000               $ 36,800,000      
CRJ-900 Aircraft [Member]                        
Organization Consolidation And Presentation Of Financial Statements [Line Items]                        
Number of aircrafts listed for sale                 11      
CRJ-900 Aircraft [Member] | American Capacity Purchase Agreement [Member]                        
Organization Consolidation And Presentation Of Financial Statements [Line Items]                        
Number of aircrafts expected to operate       3 5 5 3          
CRJ-200 Aircraft [Member]                        
Organization Consolidation And Presentation Of Financial Statements [Line Items]                        
Number of aircrafts listed for sale                 1      
Pipistrel Alpha Trainer 2 Aircraft [Member] | Mesa Pilot Development Program [Member]                        
Organization Consolidation And Presentation Of Financial Statements [Line Items]                        
Number of aircrafts purchased                 29      
Flight costs per hour | $                 $ 25      
United Express Contract [Member]                        
Organization Consolidation And Presentation Of Financial Statements [Line Items]                        
Minimum qualification term for flying aircrafts                 2 years      
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      
E-175 Aircraft [Member] | United Capacity Purchase Agreement [Member]                        
Organization Consolidation And Presentation Of Financial Statements [Line Items]                        
Number of aircrafts operated                 60      
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 day’s written notice      
Aircraft option to extend agreement description                 DHL has the option to extend the agreement with respect to one (1) or more aircraft for a period of one (1) year with 90 days’ advance written notice      
Captains [Member]                        
Organization Consolidation And Presentation Of Financial Statements [Line Items]                        
Increased overall hourly pay due to pilot shortage and attrition               11800.00%        
New Hire First Officers [Member]                        
Organization Consolidation And Presentation Of Financial Statements [Line Items]                        
Increased overall hourly pay due to pilot shortage and attrition               17200.00%        
United [Member] | CRJ-700 Aircraft [Member] | United Capacity Purchase Agreement [Member]                        
Organization Consolidation And Presentation Of Financial Statements [Line Items]                        
Number of aircrafts operated                 20      
Number of aircrafts listed for sale     18                  
Number of aircraft sold                 10      
Number of aircraft lease terminated     18                  
Aircraft lease term                 9 years      
Number of aircraft leased                 20      
United [Member] | E175LL Aircraft [Member] | United Capacity Purchase Agreement [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 10 year anniversary of the in-service date, certain accelerated margin payments.      
United [Member] | E-175 Aircraft [Member] | United Capacity Purchase Agreement [Member]                        
Organization Consolidation And Presentation Of Financial Statements [Line Items]                        
Number of aircrafts operated                 42      
Lease expiration year                 2028      
Number of aircrafts owned                 18      
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 [Member] | E-175 Aircraft [Member] | Maximum [Member] | United Capacity Purchase Agreement [Member]                        
Organization Consolidation And Presentation Of Financial Statements [Line Items]                        
Lease expiration year                 2028      
United [Member] | E-175 Aircraft [Member] | Minimum [Member] | United Capacity Purchase Agreement [Member]                        
Organization Consolidation And Presentation Of Financial Statements [Line Items]                        
Lease expiration year                 2024      
Impact of Pilot Shortage [Member]                        
Organization Consolidation And Presentation Of Financial Statements [Line Items]                        
Net cash provided by operating activities | $                 $ 13,400,000      
Net loss | $                 (182,700,000)      
Impairment charge | $                 $ 171,800,000