LEASES Operating Lease Terms Table (Details)	Sep. 30, 2019 aircraft
Operating Leased Assets [Line Items]
Property Subject to or Available for Operating Lease, Number of Units	49
Remainder Of Fiscal Year to Year Two [Member]
Operating Leased Assets [Line Items]
Property Subject to or Available for Operating Lease, Number of Units	6
Fiscal Year Three To Fiscal Year Four [Member]
Operating Leased Assets [Line Items]
Property Subject to or Available for Operating Lease, Number of Units	23
Fiscal Year Five to Fiscal Year Six [Member]
Operating Leased Assets [Line Items]
Property Subject to or Available for Operating Lease, Number of Units	20