XML 54 R35.htm IDEA: XBRL DOCUMENT v3.21.2
Organization and Operations - Additional Information (Detail)
 1 Months Ended 2 Months Ended 3 Months Ended 6 Months Ended 12 Months Ended
Nov. 19, 2020
Air-craft
Nov. 04, 2020
USD ($)
Air-craft
Dec. 20, 2019
Air-craft
Nov. 26, 2019
Air-craft
Sep. 11, 2018
USD ($)
$ / shares
shares
Aug. 14, 2018
USD ($)
$ / shares
shares
Aug. 08, 2018
shares
Jun. 02, 2021
Air-craft
Oct. 31, 2020
USD ($)
Apr. 30, 2020
USD ($)
Apr. 30, 2019
shares
Jul. 31, 2018
shares
Aug. 17, 2021
Air-craft
May 05, 2021
Air-craft
Mar. 03, 2021
Air-craft
Mar. 31, 2021
USD ($)
Mar. 31, 2021
USD ($)
Sep. 30, 2021
USD ($)
Daily_Departure
State
Air-craft
City
shares
Sep. 30, 2020
USD ($)
shares
Sep. 30, 2019
USD ($)
shares
Nov. 14, 2020
USD ($)
Nov. 13, 2020
USD ($)
Oct. 30, 2020
USD ($)
Organization Consolidation And Presentation Of Financial Statements [Line Items]                                              
Number of states in which entity operates | State                                   39          
Number of aircrafts operated | Air-craft                                   153          
Number of cities in which entity operates | City                                   129          
Number of daily departures | Daily_Departure                                   507          
Number of aircraft leased | Air-craft                                   14          
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        
Preferred stock, shares authorized | shares             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                                   4,899,497 0        
Gross proceeds from sale of shares | $         $ 124,247,820                                    
Cash and cash equivalents | $                                   $ 120,517,000 $ 99,395,000        
Drew amount from undrawn revolving credit facility | $                                   195,000,000 $ 23,000,000 $ 171,658,000      
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          
CARES act, aggregate proceeds of payroll support program extension two | $                                   56,000,000.0          
CARES act, aggregate proceeds of payroll support program extension three | $                                   $ 52,200,000          
Secured loan facility term                 5 years                            
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          
Number of aircrafts withdrawable on conditions | Air-craft                                   1          
Prepayment | $                                       $ 1,672,000      
United capacity purchase agreement termination notice period                                   30 days          
American Airlines Inc. [Member]                                              
Organization Consolidation And Presentation Of Financial Statements [Line Items]                                              
Ownership interest                                   0.00% 0.00% 7.10%      
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 E-175LL aircraft were scheduled to begin in May 2020.          
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 | Air-craft 10                                            
Maximum number of aircraft withdraw in twenty twenty two | Air-craft 5                                            
Maximum number of aircraft withdraw in twenty twenty three | Air-craft 5                                            
Aircrafts able to be withdrawn in future under normal withdrawal rights | Air-craft 20                                            
Aircrafts able to be withdrawn in future, thereafter under normal withdrawal rights | Air-craft 20                                            
American Capacity Purchase Agreement [Member] | CRJ-900 Aircraft [Member]                                              
Organization Consolidation And Presentation Of Financial Statements [Line Items]                                              
Number of aircrafts operated | Air-craft 40                                            
Number of aircrafts expected to operate | Air-craft               3         5 5 3                
United Capacity Purchase Agreement [Member] | E175LL Aircraft [Member]                                              
Organization Consolidation And Presentation Of Financial Statements [Line Items]                                              
Number of aircrafts operated | Air-craft                                   20          
Number of aircraft leased | Air-craft   20                                          
Aircraft lease term   12 years                                          
Air crafts expiring month and year description                                   expiring between November 2032 and June 2033          
United Capacity Purchase Agreement [Member] | E175LL Aircraft [Member] | United [Member]                                              
Organization Consolidation And Presentation Of Financial Statements [Line Items]                                              
Number of years in operation   12 years                                          
Prepayment | $                               $ 16,400,000 $ 65,100,000            
Amount agreed to prepay under agreement | $   $ 81,500,000                                          
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] | E-175 Aircraft [Member]                                              
Organization Consolidation And Presentation Of Financial Statements [Line Items]                                              
Number of aircrafts operated | Air-craft                                   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 | Air-craft                                   42          
Number of aircraft leased | Air-craft       42                                      
Aircraft lease extension period       5 years                                      
Number of aircrafts owned | Air-craft       18                                      
Lease expiration year       2028                                      
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 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 | Air-craft     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                                        
CRJ-900 Aircraft [Member]                                              
Organization Consolidation And Presentation Of Financial Statements [Line Items]                                              
Number of aircrafts operated | Air-craft                                   40          
Secured Term Loan Facility [Member] | Loan Agreement [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 remaining borrowing capacity | $                                         $ 0    
Maximum [Member]                                              
Organization Consolidation And Presentation Of Financial Statements [Line Items]                                              
Secured loans to the airline industry | $                                   $ 25,000,000,000          
Maximum [Member] | United Capacity Purchase Agreement [Member] | E-175 Aircraft [Member] | United [Member]                                              
Organization Consolidation And Presentation Of Financial Statements [Line Items]                                              
Lease expiration year       2028                                      
Maximum [Member] | Secured Term Loan Facility [Member] | Loan Agreement [Member]                                              
Organization Consolidation And Presentation Of Financial Statements [Line Items]                                              
Secured term loan facility, maximum borrowing capacity | $                 $ 200,000,000.0                            
Minimum [Member] | United Capacity Purchase Agreement [Member] | E-175 Aircraft [Member] | United [Member]                                              
Organization Consolidation And Presentation Of Financial Statements [Line Items]                                              
Lease expiration year       2024                                      
LIBOR [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         3,827,493             346,123 910,297 321,926      
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] | 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