XML 45 R33.htm IDEA: XBRL DOCUMENT v3.19.2
Organization and Operations - Additional Information (Detail)
$ / shares in Units, $ in Millions
 1 Months Ended 9 Months Ended 12 Months Ended
Aug. 12, 2019
Air-craft
Extension
Jun. 30, 2019
Daily_Departure
State
Air-craft
shares
Apr. 09, 2019
Sep. 11, 2018
$ / shares
shares
Aug. 14, 2018
USD ($)
$ / shares
shares
Aug. 08, 2018
shares
Jul. 31, 2019
Air-craft
Jun. 30, 2019
USD ($)
Daily_Departure
State
Air-craft
City
Employee
Extension
shares
Sep. 30, 2018
Air-craft
Extension
shares
Apr. 02, 2019
Air-craft
Organization Consolidation And Presentation Of Financial Statements [Line Items]                    
Number of states in which entity operates | State   42           42    
Number of aircrafts operated | Air-craft               145    
Number of cities in which entity operates | City               138    
Number of daily departures | Daily_Departure   761           761    
Number of employees | Employee               3,400    
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   4,603,333           4,603,333 10,614,990  
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
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 Mesa notice of 90 days or more    
United [Member]                    
Organization Consolidation And Presentation Of Financial Statements [Line Items]                    
Number of extension | Extension               4 4  
Renewal term extension period               2 years 2 years  
Subsequent Event [Member]                    
Organization Consolidation And Presentation Of Financial Statements [Line Items]                    
Number of aircraft permanently withdraw due to failure to meet new/revised performance metrics | Air-craft             2      
Minimum [Member]                    
Organization Consolidation And Presentation Of Financial Statements [Line Items]                    
Capacity purchase agreement, expiration year               2021    
Maximum [Member]                    
Organization Consolidation And Presentation Of Financial Statements [Line Items]                    
Capacity purchase agreement, expiration year               2025    
Maximum [Member] | United [Member]                    
Organization Consolidation And Presentation Of Financial Statements [Line Items]                    
Aggregate extension period               8 years 8 years  
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    
CRJ-700 Aircraft [Member] | Minimum [Member]                    
Organization Consolidation And Presentation Of Financial Statements [Line Items]                    
Early termination right, expiration period               2019-08    
CRJ-700 Aircraft [Member] | Maximum [Member]                    
Organization Consolidation And Presentation Of Financial Statements [Line Items]                    
Early termination right, expiration period               2019-12    
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 operated | Air-craft               30 12  
E-175 Aircraft [Member] | Subsequent Event [Member] | United [Member]                    
Organization Consolidation And Presentation Of Financial Statements [Line Items]                    
Number of aircrafts operated | Air-craft 30                  
Number of extension | Extension 4                  
Renewal term extension period 2 years                  
E-175 Aircraft [Member] | Minimum [Member] | Mesa [Member]                    
Organization Consolidation And Presentation Of Financial Statements [Line Items]                    
Early termination right, expiration period               2028-01    
E-175 Aircraft [Member] | Minimum [Member] | United [Member]                    
Organization Consolidation And Presentation Of Financial Statements [Line Items]                    
Early termination right, expiration period               2019-06    
E-175 Aircraft [Member] | Minimum [Member] | Subsequent Event [Member] | United [Member]                    
Organization Consolidation And Presentation Of Financial Statements [Line Items]                    
Early termination right, expiration period 2019-10                  
E-175 Aircraft [Member] | Maximum [Member] | Mesa [Member]                    
Organization Consolidation And Presentation Of Financial Statements [Line Items]                    
Early termination right, expiration period               2028-11    
E-175 Aircraft [Member] | Maximum [Member] | United [Member]                    
Organization Consolidation And Presentation Of Financial Statements [Line Items]                    
Early termination right, expiration period               2020-08    
E-175 Aircraft [Member] | Maximum [Member] | Subsequent Event [Member] | United [Member]                    
Organization Consolidation And Presentation Of Financial Statements [Line Items]                    
Early termination right, expiration period 2020-08                  
Aggregate extension period 8 years                  
American Airlines Inc. [Member]                    
Organization Consolidation And Presentation Of Financial Statements [Line Items]                    
Ownership interest   7.20%           7.20% 7.20%  
Restricted Stock [Member]                    
Organization Consolidation And Presentation Of Financial Statements [Line Items]                    
Number of Shares, Granted               306,843    
2018 Equity Incentive Plan [Member]                    
Organization Consolidation And Presentation Of Financial Statements [Line Items]                    
Common stock, stock split               2.5-for-1 stock split effected    
Stock split ratio     2.5              
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]                    
Number of Shares, Granted         1,266,034          
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] | 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 | $         $ 115.6     $ 124.2    
Net proceeds from initial public offering | $               111.7    
Underwriting discounts and commissions | $               8.7    
Offering costs | $               $ 3.8    
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