Use your AAdvantage® miles to upgrade for you or a designated passenger on flights advertised and operated by American Airlines or American Eagle. Upgrades are available for one one-way trip with a maximum of three segments in the following cabin of service. Capacity restrictions apply to upgrades.

Call us at +1-888-566-5066 in PST business hours for American Airlines Seat Upgrade.
<a href="https://www.flyamericans.com/blog/american-airlines-seat-upgrade">American Airlines Seat Upgrade</a>