Related Party Transactions (Details)	1 Months Ended	3 Months Ended		9 Months Ended
	Oct. 31, 2020 USD ($)	Sep. 30, 2020 USD ($)	Sep. 30, 2019 USD ($)	Sep. 30, 2020 USD ($) aircraft. engine	Sep. 30, 2019 USD ($) engine aircraft.
Chief Executive Officer | Subsequent Event
Related Party Transaction [Line Items]
Related Party Transaction, Daily Lease Payment Made To Related Party	$ 500
Annual Insurance Premium	6,800
One-Time Subscriber Fee	$ 695
WMES
Related Party Transaction [Line Items]
Number of engines sold | engine				1
Proceeds from sale of engine				$ 8,400,000
Number of aircrafts sold | aircraft.					5
Proceeds from sale of aircraft					$ 76,400,000
WMES | Other Income | Asset Management
Related Party Transaction [Line Items]
Maintenance reserve revenue		$ 400,000	$ 700,000	$ 1,200,000	$ 1,800,000
Willis Aeronautical Services, Inc.
Related Party Transaction [Line Items]
Number of engines sold | engine					1
Proceeds from sale of engine					$ 2,600,000
CASC Willis
Related Party Transaction [Line Items]
Number of engines sold | engine				0	0
Number of aircrafts sold | aircraft.				0	0