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Debt - Additional Information (Detail)	12 Months Ended
Debt - Additional Information (Detail)	Dec. 31, 2017 Aircraft Transactions
Debt Instrument [Line Items]
Number of jet aircraft committed to capital leases \| Aircraft	33
Collateral coverage tests, number of financing transactions \| Transactions	4
American Airlines, Inc. [Member]
Debt Instrument [Line Items]
Number of jet aircraft committed to capital leases \| Aircraft	33
Collateral coverage tests, number of financing transactions \| Transactions	4