OPERATIONS, BASIS OF PRESENTATION AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES, Operations (Details)  | 
12 Months Ended | 
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 Mar. 31, 2020  
Aircraft 
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| Operations, Basis of Presentation and Summary of Significant Accounting Policies [Abstract] | |
| Number of aircraft operated | 315 | 
| Unconsolidated Affiliates | |
| Operations, Basis of Presentation and Summary of Significant Accounting Policies [Abstract] | |
| Number of aircraft operated | 105 | 
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. No definition available. 
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- Definition Number of aircraft operated by the carrier. No definition available. 
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- Details 
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