American Airlines upgrade with miles offers its passengers the option to upgrade their flights using miles. This allows travelers to enhance their travel experience by enjoying... moreAmerican Airlines upgrade with miles offers its passengers the option to upgrade their flights using miles. This allows travelers to enhance their travel experience by enjoying the benefits of a higher class of service. Passengers can use their AAdvantage miles, the airline's frequent flyer program currency, to upgrade from Economy to Premium Economy, Business, or First Class, depending on availability. Upgrading with miles provides access to more comfortable seating, enhanced amenities, priority boarding, and better in-flight services. To upgrade, travelers can either use miles during the booking process, through the American Airlines website, or by contacting the reservations team. Upgrades are subject to availability and fare class restrictions.See Also: American Airlines Group Travel less