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Organization and Operations - Additional Information (Detail)
 1 Months Ended 12 Months Ended
Nov. 26, 2019
Air-craft
Sep. 30, 2019
Daily_Departure
State
Air-craft
shares
Sep. 11, 2018
USD ($)
$ / shares
shares
Aug. 14, 2018
USD ($)
$ / shares
shares
Aug. 08, 2018
shares
Aug. 28, 2019
Air-craft
Jul. 31, 2019
Air-craft
Apr. 30, 2019
shares
Jul. 31, 2018
shares
Sep. 30, 2019
USD ($)
Daily_Departure
State
Air-craft
City
shares
Sep. 30, 2018
USD ($)
shares
Sep. 30, 2017
shares
Apr. 02, 2019
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 | Air-craft                   145      
Number of cities in which entity operates | City                   125      
Number of daily departures | Daily_Departure   730               730      
Common stock, stock split                   Effected a 2.5-for-1 stock split      
Stock split ratio         2.5                
Common stock, shares authorized   125,000,000     125,000,000         125,000,000 125,000,000    
Preferred stock, shares authorized   5,000,000     5,000,000         5,000,000 5,000,000    
Stock issued during period, shares, new issues     1,344,500                    
Common stock, warrants issued   3,600,953               3,600,953 10,614,990    
Gross proceeds from sale of shares | $     $ 124,247,820               $ 124,246,000    
Maximum number of aircraft to permanently withdraw in the event company fails to meet new/ revise performance metrics | Air-craft   6                      
Number of aircraft converted to be utilized as operational spares | Air-craft                         2
Number of aircraft permanently withdraw due to failure to meet new/revised performance metrics | Air-craft             2            
Number of additional aircraft permanently withdrawn due to company's failure to meet certain performance metrics | Air-craft           2              
Payment of lease cost | $                     $ 1,900,000    
Number of leased aircraft | Air-craft   18               18      
Notice period for termination of agreement                   The capacity purchase agreement is also subject to early termination for cause under specified circumstances and subject to the Company's right to cure under certain circumstances. United is also permitted, subject to certain conditions, to terminate the agreement early in its discretion by giving us notice of 90 days or more.      
CRJ-900 Aircraft [Member]                          
Organization Consolidation And Presentation Of Financial Statements [Line Items]                          
Number of aircrafts operated | Air-craft                   62      
CRJ-700 Aircraft [Member]                          
Organization Consolidation And Presentation Of Financial Statements [Line Items]                          
Number of aircrafts operated | Air-craft                   20      
E-175 Aircraft [Member]                          
Organization Consolidation And Presentation Of Financial Statements [Line Items]                          
Number of aircrafts operated | Air-craft                   60      
E-175 Aircraft [Member] | Mesa [Member]                          
Organization Consolidation And Presentation Of Financial Statements [Line Items]                          
Number of aircrafts operated | Air-craft                   18      
E-175 Aircraft [Member] | United [Member]                          
Organization Consolidation And Presentation Of Financial Statements [Line Items]                          
Number of aircrafts purchased | Air-craft                   42      
American Airlines Inc. [Member]                          
Organization Consolidation And Presentation Of Financial Statements [Line Items]                          
Ownership interest   7.10%               7.10% 7.20%    
2018 Equity Incentive Plan [Member]                          
Organization Consolidation And Presentation Of Financial Statements [Line Items]                          
Stock withheld to cover tax withholding requirements upon vesting to restricted stock units shares       314,198                  
Restricted stock, shares issued net of shares for tax withholdings       651,824                  
2018 Equity Incentive Plan [Member] | Restricted Stock [Member]                          
Organization Consolidation And Presentation Of Financial Statements [Line Items]                          
Stock issued during period, shares, new issues                 2,249,147        
Number of Shares, Granted       1,266,034       2,571,073   321,926   0  
Number of Shares, vested       966,022                  
2018 Equity Incentive Plan [Member] | Restricted Stock [Member] | Employees [Member]                          
Organization Consolidation And Presentation Of Financial Statements [Line Items]                          
Additional restricted common stock shares issued       983,113                  
2011 and 2017 Plans [Member] | Restricted Stock [Member]                          
Organization Consolidation And Presentation Of Financial Statements [Line Items]                          
Number of Shares, Granted                     0 251,615  
2011 and 2017 Plans [Member] | Restricted Stock [Member] | Employees [Member]                          
Organization Consolidation And Presentation Of Financial Statements [Line Items]                          
Cancellation of common stock shares existing unvested restricted phantom units       491,915                  
Cancellation of common stock shares existing of unvested restricted stock       491,198                  
IPO [Member]                          
Organization Consolidation And Presentation Of Financial Statements [Line Items]                          
Stock issued during period, shares, new issues       9,630,000                  
Shares issued, price per share | $ / shares       $ 12.00                  
Gross proceeds of initial public offering | $       $ 115,600,000           $ 124,200,000      
Underwriter Options [Member]                          
Organization Consolidation And Presentation Of Financial Statements [Line Items]                          
Common stock, warrants issued       1,444,500                  
Purchased Directly From Company [Member]                          
Organization Consolidation And Presentation Of Financial Statements [Line Items]                          
Stock issued during period, shares, new issues     723,985                    
Purchased Directly From Selling Shareholders [Member]                          
Organization Consolidation And Presentation Of Financial Statements [Line Items]                          
Stock issued during period, shares, new issues     620,515                    
Firm Shares and Option Shares [Member]                          
Organization Consolidation And Presentation Of Financial Statements [Line Items]                          
Shares issued, price per share | $ / shares     $ 12.00                    
Subsequent Event [Member] | CRJ-700 Aircraft [Member]                          
Organization Consolidation And Presentation Of Financial Statements [Line Items]                          
Number of leased aircraft | Air-craft 20                        
Aircraft lease term 7 years                        
Subsequent Event [Member] | CRJ-700 Aircraft [Member] | United [Member]                          
Organization Consolidation And Presentation Of Financial Statements [Line Items]                          
Aircraft lease term 7 years                        
Subsequent Event [Member] | E-175 Aircraft [Member]                          
Organization Consolidation And Presentation Of Financial Statements [Line Items]                          
Number of additional aircrafts | Air-craft 18                        
Lease expiration year 2028                        
Subsequent Event [Member] | E-175 Aircraft [Member] | United [Member]                          
Organization Consolidation And Presentation Of Financial Statements [Line Items]                          
Number of aircrafts operated | Air-craft 42                        
Aircraft lease extension period 5 years                        
Subsequent Event [Member] | E-175 Aircraft [Member] | United [Member] | Minimum [Member]                          
Organization Consolidation And Presentation Of Financial Statements [Line Items]                          
Lease expiration year 2024                        
Subsequent Event [Member] | E-175 Aircraft [Member] | United [Member] | Maximum [Member]                          
Organization Consolidation And Presentation Of Financial Statements [Line Items]                          
Lease expiration year 2028                        
Subsequent Event [Member] | E175LL Aircraft [Member]                          
Organization Consolidation And Presentation Of Financial Statements [Line Items]                          
Number of aircrafts operated | Air-craft 80                        
Number of additional aircrafts | Air-craft 20                        
Number of years in operation 12 years