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Organization and Operations - Additional Information (Detail)
 1 Months Ended 12 Months Ended
Nov. 04, 2020
USD ($)
Jun. 15, 2020
Air-craft
Jun. 01, 2020
Air-craft
May 19, 2020
Air-craft
Apr. 03, 2020
Air-craft
Jan. 02, 2020
Air-craft
Nov. 26, 2019
Air-craft
Nov. 25, 2019
Air-craft
Sep. 11, 2018
USD ($)
$ / shares
shares
Aug. 14, 2018
USD ($)
$ / shares
shares
Aug. 08, 2018
shares
Oct. 31, 2020
USD ($)
Apr. 30, 2020
USD ($)
Nov. 30, 2019
Air-craft
Sep. 30, 2019
USD ($)
Air-craft
shares
Jul. 31, 2019
Air-craft
Apr. 30, 2019
shares
Jan. 31, 2019
Air-craft
Jul. 31, 2018
shares
Sep. 30, 2020
USD ($)
Daily_Departure
State
Air-craft
City
shares
Sep. 30, 2019
USD ($)
shares
Sep. 30, 2018
USD ($)
shares
Nov. 14, 2020
USD ($)
Nov. 13, 2020
USD ($)
Oct. 30, 2020
USD ($)
Apr. 02, 2019
Air-craft
Organization Consolidation And Presentation Of Financial Statements [Line Items]                                                    
Number of states in which entity operates | State                                       39            
Number of aircrafts operated | Air-craft                                       146            
Number of cities in which entity operates | City                                       102            
Number of daily departures | Daily_Departure                                       373            
Common stock, stock split                                       effected a 2.5-for-1 stock split            
Stock split ratio                     2.5                              
Common stock, shares authorized | shares                     125,000,000       125,000,000         125,000,000 125,000,000          
Preferred stock, shares authorized | shares                     5,000,000       5,000,000         5,000,000 5,000,000          
Stock issued during period, shares, new issues | shares                 1,344,500                                  
Common stock, warrants issued | shares                             3,600,953         0 3,600,953          
Gross proceeds from sale of shares | $                 $ 124,247,820                         $ 124,246,000        
Cash and cash equivalents | $                             $ 68,855,000         $ 99,395,000 $ 68,855,000          
Drew amount from undrawn revolving credit facility | $                                       $ 23,000,000 171,658,000 $ 187,703,000        
CARES act grant amount | $                         $ 92,500,000                          
CARES act, increasing percentage of payroll                                       2.00%            
CARES act, additional grant amount | $                                       $ 2,700,000            
CARES act, total grant amount | $                                       95,200,000            
CARES act, utilized offset payroll expenses | $                                       83,800,000            
CARES act, deferred offset future payroll cost | $                                       $ 11,400,000            
Secured loan facility interest rate description                                       Accrued interest on the loans is payable in arrears on the first business day following the 14th day of each March, June, September and December (beginning with December 15, 2020), and on the maturity date.            
American capacity purchase agreement termination notice period                                       15 days            
Maximum number of aircraft to withdraw in the event company fails to meet new/ revise performance metrics | Air-craft                                       14            
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   2   2                   2                    
Number of additional aircraft permanently withdrawn due to company's failure to meet certain performance metrics | Air-craft               2                                    
Number of aircraft removed due to failure to meet new/revised performance metrics | Air-craft           3                                        
Number of aircraft that would be withdrawn at any time due to failure to meet new/revised performance metrics | Air-craft         3 3               3 3                      
Number of deferred aircraft elected to remove | Air-craft     1     1                                        
Notice period for termination of agreement                                       Our United Capacity Purchase 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 aircraft from service, by giving us notice of 90 days or more.            
Prepayment | $                                         $ 1,672,000          
United capacity purchase agreement termination notice period                                       30 days            
CRJ-700 Aircraft [Member]                                                    
Organization Consolidation And Presentation Of Financial Statements [Line Items]                                                    
Number of aircrafts operated | Air-craft                                       20            
CRJ-700 Aircraft [Member] | United [Member]                                                    
Organization Consolidation And Presentation Of Financial Statements [Line Items]                                                    
Aircraft lease term             7 years                                      
E-175 Aircraft [Member]                                                    
Organization Consolidation And Presentation Of Financial Statements [Line Items]                                                    
Number of aircrafts operated | Air-craft             18                         60            
Lease expiration year             2028                                      
E-175 Aircraft [Member] | United [Member]                                                    
Organization Consolidation And Presentation Of Financial Statements [Line Items]                                                    
Number of aircrafts operated | Air-craft             42                         42            
Aircraft lease extension period             5 years                                      
E175LL Aircraft [Member]                                                    
Organization Consolidation And Presentation Of Financial Statements [Line Items]                                                    
Number of additional aircrafts | Air-craft             20                                      
Number of years in operation             12 years                                      
Air drafts delivery month and year description.                                       Deliveries of the new E175LL aircraft were scheduled to begin in May 2020.            
Termination of aircraft operation, description                                       Commencing five (5) years after the actual in-service date, United has the right to remove the E175LL 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.            
American Airlines Inc. [Member]                                                    
Organization Consolidation And Presentation Of Financial Statements [Line Items]                                                    
Ownership interest                             7.10%         0.00% 7.10% 7.20%        
CRJ-900 Aircraft [Member]                                                    
Organization Consolidation And Presentation Of Financial Statements [Line Items]                                                    
Number of aircrafts operated | Air-craft                                       54            
CRJ-900 Aircraft [Member] | Aircraft Lease Expire In 2021 [Member]                                                    
Organization Consolidation And Presentation Of Financial Statements [Line Items]                                                    
Number of operated aircrafts expired or set to expire | Air-craft                                       31            
Lease expiration year                                       2021            
CRJ-900 Aircraft [Member] | Aircraft Lease Expire In 2022 [Member]                                                    
Organization Consolidation And Presentation Of Financial Statements [Line Items]                                                    
Number of operated aircrafts expired or set to expire | Air-craft                                       16            
Lease expiration year                                       2022            
CRJ-900 Aircraft [Member] | Aircraft Lease Expire In 2025 [Member]                                                    
Organization Consolidation And Presentation Of Financial Statements [Line Items]                                                    
Number of operated aircrafts expired or set to expire | Air-craft                                       7            
Lease expiration year                                       2025            
Maximum [Member]                                                    
Organization Consolidation And Presentation Of Financial Statements [Line Items]                                                    
Secured loans to the airline industry | $                                       $ 25,000,000,000            
Capacity purchase agreement, expiration year                                       2025            
Maximum [Member] | E-175 Aircraft [Member] | United [Member]                                                    
Organization Consolidation And Presentation Of Financial Statements [Line Items]                                                    
Lease expiration year             2028                                      
Minimum [Member]                                                    
Organization Consolidation And Presentation Of Financial Statements [Line Items]                                                    
Capacity purchase agreement, expiration year                                       2021            
Minimum [Member] | E-175 Aircraft [Member] | United [Member]                                                    
Organization Consolidation And Presentation Of Financial Statements [Line Items]                                                    
Lease expiration year             2024                                      
Subsequent Event [Member]                                                    
Organization Consolidation And Presentation Of Financial Statements [Line Items]                                                    
Secured loans to the airline industry | $                                             $ 195,000,000.0 $ 152,000,000.0 $ 43,000,000.0  
Secured loan facility term                       5 years                            
Secured loan facility remaining borrowing capacity | $                                             $ 0      
Subsequent Event [Member] | United [Member] | United Capacity Purchase Agreement [Member]                                                    
Organization Consolidation And Presentation Of Financial Statements [Line Items]                                                    
Number of years in operation 12 years                                                  
Prepayment | $ $ 85,000,000.0                                                  
Prepayment term 4 months                                                  
Subsequent Event [Member] | Maximum [Member]                                                    
Organization Consolidation And Presentation Of Financial Statements [Line Items]                                                    
Secured loan facility maximum borrowing capacity | $                       $ 200,000,000.0                            
LIBOR [Member] | Subsequent Event [Member]                                                    
Organization Consolidation And Presentation Of Financial Statements [Line Items]                                                    
Secured loan facility interest rate                       3.50%                            
Revolving Credit Facility [Member]                                                    
Organization Consolidation And Presentation Of Financial Statements [Line Items]                                                    
Drew amount from undrawn revolving credit facility | $                                       $ 23,000,000.0            
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 | shares                   314,198                                
Restricted stock, shares issued net of shares for tax withholdings | shares                   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 | shares                                     2,249,147              
Number of Shares, Granted | shares                   1,266,034             3,481,370     910,297 321,926          
Number of Shares, vested | shares                   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 | shares                   983,113                                
2011 and 2017 Plans [Member] | Restricted Stock [Member]                                                    
Organization Consolidation And Presentation Of Financial Statements [Line Items]                                                    
Number of Shares, Granted | shares                                           0        
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 | shares                   491,915                                
Cancellation of common stock shares existing of unvested restricted stock | shares                   491,198                                
IPO [Member]                                                    
Organization Consolidation And Presentation Of Financial Statements [Line Items]                                                    
Stock issued during period, shares, new issues | shares                   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 | shares                   1,444,500                                
Purchased Directly From Company [Member]                                                    
Organization Consolidation And Presentation Of Financial Statements [Line Items]                                                    
Stock issued during period, shares, new issues | shares                 723,985                                  
Purchased Directly From Selling Shareholders [Member]                                                    
Organization Consolidation And Presentation Of Financial Statements [Line Items]                                                    
Stock issued during period, shares, new issues | shares                 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