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OPERATIONS, BASIS OF PRESENTATION AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES, Property and Equipment (Details)

v3.20.1
OPERATIONS, BASIS OF PRESENTATION AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES, Property and Equipment (Details)
$ in Millions
5 Months Ended 12 Months Ended
Mar. 31, 2020
USD ($)
Mar. 31, 2020
USD ($)
FlightHour
Mar. 31, 2019
USD ($)
Oct. 31, 2019
Operations, Basis of Presentation and Summary of Significant Accounting Policies [Abstract]        
Construction in progress | $ $ 7.8 $ 7.8 $ 51.7  
Useful lives 30 years      
Minimum        
Operations, Basis of Presentation and Summary of Significant Accounting Policies [Abstract]        
Property and equipment, salvage value percentage       5.00%
Maximum        
Operations, Basis of Presentation and Summary of Significant Accounting Policies [Abstract]        
Property and equipment, salvage value percentage       25.00%
Aircraft        
Operations, Basis of Presentation and Summary of Significant Accounting Policies [Abstract]        
Useful lives   30 years    
Aircraft | Minimum        
Operations, Basis of Presentation and Summary of Significant Accounting Policies [Abstract]        
Useful lives     5 years  
Property and equipment, salvage value percentage 5.00% 5.00% 30.00%  
Aircraft | Maximum        
Operations, Basis of Presentation and Summary of Significant Accounting Policies [Abstract]        
Useful lives     15 years  
Property and equipment, salvage value percentage 25.00% 25.00% 50.00%  
Useful lives flight hour restriction | FlightHour   30,000