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LEASES - Rent payment deferrals (Details) - USD ($)
$ in Thousands
Mar. 31, 2021
Dec. 31, 2020
LEASES    
Aircraft Lease Payment Deferrals $ 975 $ 7,569
Finance leases    
LEASES    
Aircraft Lease Payment Deferrals 533 2,133
Operating leases    
LEASES    
Aircraft Lease Payment Deferrals $ 442 $ 5,436