@Americanflytrip
To get an American Airlines Seat Upgrade, you can use your miles, Systemwide Upgrades, business extra, and British Airways Avios. Eligible elite members of the AAdvantage program can get complimentary AA upgrades. Request the AA customer service team to upgrade while booking or at check-in.
See More: https://www.americanflytrip.com/blog/american-airlines-seat-upgrade/