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LEASES - Operating Lease Terms Table (Details) | 3 Months Ended
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Jun. 30, 2020 aircraft
Operating Leased Assets [Line Items] |
Number of units | 45
Nine months ending March 31, 2021 to fiscal year 2022 |
Operating Leased Assets [Line Items] |
Number of units | 16
Fiscal year 2023 to fiscal year 2024 |
Operating Leased Assets [Line Items] |
Number of units | 19
Fiscal year 2025 to fiscal year 2026 |
Operating Leased Assets [Line Items] |
Number of units | 10

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