BASIS OF PRESENTATION, CONSOLIDATION AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES Other accrued liabilities (Details) - USD ($) $ in Thousands	Sep. 30, 2019	Mar. 31, 2019
Accrued lease costs	$ 1,291	$ 6,017
Deferred OEM cost recovery	0	3,997
Backstop Commitment Agreement	19,250	0
Accrued legal and professional fees	17,446	3,070
Accrued property and equipment	860	997
Deferred gain on sale leasebacks	789	1,305
Other operating accruals	18,798	14,437
Other accrued liabilities	58,434	38,679
Eastern Airways International Limited [Member]
Other accrued liabilities	$ 0	$ 8,856