Annual report pursuant to Section 13 and 15(d)

PROPERTY AND EQUIPMENT - Property and Equipment Disposals (Details)

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PROPERTY AND EQUIPMENT - Property and Equipment Disposals (Details)
$ in Thousands
 1 Months Ended 5 Months Ended 7 Months Ended 12 Months Ended
Oct. 31, 2019
USD ($)
aircraft
Mar. 31, 2020
USD ($)
aircraft
Oct. 31, 2019
USD ($)
aircraft
Mar. 31, 2021
USD ($)
aircraft
Mar. 31, 2019
USD ($)
aircraft
Property, Plant and Equipment [Line Items]          
Number of aircraft sold or disposed of | aircraft   5 3 54 8
Deposits on assets held for sale   $ 4,500 $ 0 $ 0 $ 0
Proceeds from sale or disposal of assets   13,845 5,314 67,882 13,813
Loss from sale or disposal of assets   $ 451 3,768 $ 8,199 $ 4,995
Number of aircraft impaired | aircraft 14 0   8 5
Impairment charges on assets held for sale $ 0 $ 0   $ 7,792 $ 8,149
Impairment charges on property and equipment 42,022 0   0 104,939
Contract termination costs 0 0   0 14,699
Fresh-start accounting adjustment 768,630 $ 0 768,630 $ 0 0
Property and equipment fair value $ 931,700   931,700    
Aircraft Purchase Contract          
Property, Plant and Equipment [Line Items]          
Contract termination costs, progress payments         11,700
Contract termination costs, capitalized interest         2,300
Aircraft Options          
Property, Plant and Equipment [Line Items]          
Contract termination costs, progress payments         500
Contract termination costs, capitalized interest         200
H225 Aircraft          
Property, Plant and Equipment [Line Items]          
Impairment charges on property and equipment     $ 42,000   87,500
Eastern Airways          
Property, Plant and Equipment [Line Items]          
Impairment charges on property and equipment         $ 17,500