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COMMITMENTS AND CONTINGENCIES - Additional Information (Details) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
COMMITMENTS AND CONTINGENCIES    
Expenses incurred under the operating lease agreements $ 1.6 $ 1.5
Purchase commitments for the acquisition of Flight Equipment $ 22.4  
Percentage of deposit paid to acquisition of Flight Equipment 10.00%