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Organization and Operations - Additional Information (Detail)
$ / shares in Units, $ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2023
USD ($)
AirCraft
Jun. 22, 2023
USD ($)
Engine
Apr. 03, 2023
AirCraft
Dec. 20, 2019
AirCraft
Jun. 30, 2023
USD ($)
DailyDeparture
Engine
State
AirCraft
$ / shares
shares
Mar. 31, 2023
USD ($)
AirCraft
Dec. 31, 2022
USD ($)
Jun. 30, 2022
USD ($)
Mar. 31, 2022
USD ($)
Dec. 31, 2021
USD ($)
Jun. 30, 2023
USD ($)
DailyDeparture
AirCraft
Engine
City
Employee
State
$ / shares
shares
Jun. 30, 2022
USD ($)
Sep. 30, 2022
USD ($)
$ / shares
shares
Organization Consolidation And Presentation Of Financial Statements [Line Items]                          
Number of states in which entity operates | State         40           40    
Number of aircrafts operated                     80    
Number of cities in which entity operates | City                     89    
Number of daily departures | DailyDeparture         277           277    
Number of employees | Employee                     2,341    
Net cash provided by operating activities | $                     $ (13,837) $ 13,584  
Net income (loss) | $         $ (47,560) $ (35,122) $ (9,090) $ (9,985) $ (42,783) $ (14,274) (91,771) $ (67,042)  
Long-term debt | $         124,300           124,300    
Deferred income taxes | $         $ 11,561           $ 11,561   $ 17,719
Number of leased aircraft         18           18    
United capacity purchase agreement termination notice period                     30 days    
Common stock, no par value | $ / shares         $ 0           $ 0   $ 0
Common stock, shares issued | shares         40,830,594           40,830,594   36,376,897
Impact of Pilot Shortage and Transition of Operations to United [Member]                          
Organization Consolidation And Presentation Of Financial Statements [Line Items]                          
Net cash provided by operating activities | $                     $ 13,800    
Net income (loss) | $                     91,800    
Non-cash impairment charge | $                     $ 51,000    
United [Member]                          
Organization Consolidation And Presentation Of Financial Statements [Line Items]                          
Number of aircraft sold | Engine                     30    
Number of spare engines to be sold | Engine   20     20                
Gross proceeds from sale of asset | $   $ 53,700     $ 53,700                
Number of engine sold | Engine         20           30    
Gain on the sale of engines | $         $ 6,700           $ 7,300    
Proceeds from sale of asset | $   $ 26,900     $ 26,900                
United [Member] | Engine Sale Agreement [Member]                          
Organization Consolidation And Presentation Of Financial Statements [Line Items]                          
Number of engine sold | Engine   30     30                
United Capacity Purchase Agreement [Member]                          
Organization Consolidation And Presentation Of Financial Statements [Line Items]                          
Number of aircrafts operated                     80    
B-737 Aircraft [Member]                          
Organization Consolidation And Presentation Of Financial Statements [Line Items]                          
Number of aircrafts operated                     4    
CRJ-900 Aircraft [Member]                          
Organization Consolidation And Presentation Of Financial Statements [Line Items]                          
Number of aircrafts listed for sale                     11    
Number of surplus aircraft to be sold                     7    
Proceeds from sale of property | $                     $ 8,500    
Number of aircraft sold           4              
Number of aircraft classified as assets held for sale                     14    
Gross proceeds from sale of asset | $                     $ 71,800    
CRJ-900 Aircraft [Member] | Forecast [Member]                          
Organization Consolidation And Presentation Of Financial Statements [Line Items]                          
Number of aircraft sold 7                        
Gross proceeds from sale of asset | $ $ 21,000                        
CRJ-900 Aircraft [Member] | American Capacity Purchase Agreement [Member]                          
Organization Consolidation And Presentation Of Financial Statements [Line Items]                          
Number of aircrafts operated     30                    
CRJ-900 Aircraft [Member] | United Capacity Purchase Agreement [Member]                          
Organization Consolidation And Presentation Of Financial Statements [Line Items]                          
Number of aircrafts operated         24                
CRJ-200 Aircraft [Member]                          
Organization Consolidation And Presentation Of Financial Statements [Line Items]                          
Number of aircrafts listed for sale                     1    
E-175 Aircraft [Member] | United Capacity Purchase Agreement [Member]                          
Organization Consolidation And Presentation Of Financial Statements [Line Items]                          
Number of aircrafts operated         56                
E-175 Aircraft [Member] | United Capacity Purchase Agreement [Member] | United [Member]                          
Organization Consolidation And Presentation Of Financial Statements [Line Items]                          
Number of aircrafts operated         42                
Number of aircrafts owned         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    
E-175 Aircraft [Member] | United Capacity Purchase Agreement [Member] | United [Member] | Minimum [Member]                          
Organization Consolidation And Presentation Of Financial Statements [Line Items]                          
Lease expiration year         2024                
E-175 Aircraft [Member] | United Capacity Purchase Agreement [Member] | United [Member] | Maximum [Member]                          
Organization Consolidation And Presentation Of Financial Statements [Line Items]                          
Lease expiration year         2028                
E175LL Aircraft [Member] | United Capacity Purchase Agreement [Member]                          
Organization Consolidation And Presentation Of Financial Statements [Line Items]                          
Air crafts expiring month and year description         in 2032 and 2033                
Boeing 737400F [Member] | DHL Flight Services Agreement [Member]                          
Organization Consolidation And Presentation Of Financial Statements [Line Items]                          
Number of aircrafts operated       4                  
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 days' 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 year with 90 days’ advance written notice.    
Boeing 737-800F [Member] | DHL Flight Services Agreement [Member]                          
Organization Consolidation And Presentation Of Financial Statements [Line Items]                          
Number of aircraft leased       1                  
UMB Engine Loan [Member] | United [Member]                          
Organization Consolidation And Presentation Of Financial Statements [Line Items]                          
Debt reduction amount | $   $ 7,800                      
United Bridge Loan [Member] | United [Member]                          
Organization Consolidation And Presentation Of Financial Statements [Line Items]                          
Debt reduction amount | $   7,900                      
UST Loan [Member] | United [Member]                          
Organization Consolidation And Presentation Of Financial Statements [Line Items]                          
Debt reduction amount | $   $ 11,200