Types of upgrades on American Airlines: Systemwide upgrades − AAdvantage program

There are a few different ways that you can get an upgrade on American Airlines. Some of these options are available for any traveler, while others are only applicable to members who have elite status or an American Airlines credit card. In order to upgrade, you must have an eligible ticket and there must be space available. Upgrades are never guaranteed until they’ve been confirmed by the airline. (aviationrepublic.com) More...