EARNINGS PER SHARE (Net Loss Attributable to Common Stockholders) (Details) - USD ($) $ / shares in Units, $ in Thousands	1 Months Ended	11 Months Ended	12 Months Ended
	Feb. 08, 2018	Dec. 31, 2018	Dec. 31, 2019
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items]
Net loss	$ (14,862)	$ (1,524,699)	$ (450,538)
Loss per common share attributable to AMR common stockholders:
Basic and diluted loss per common share attributable to AMR common stockholders (in dollars per share)		$ (8.71)	$ (2.48)
Common Class A
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items]
Net loss		$ (1,524,699)	$ (450,538)
Effect of dilutive securities:
Weighted average common shares outstanding (Basic and Diluted) (in shares)		175,151,969	181,636,795
Loss per common share attributable to AMR common stockholders:
Basic and diluted loss per common share attributable to AMR common stockholders (in dollars per share)		$ (8.71)	$ (2.48)