Over the last 2 years the app team for AA has turned this from an embarrassment to a nice and functional app. I use it for checking in, using electronic boarding passes, checking flight status and upgrade lists, and progress towards frequent flier tiers. Works great. AA please keep the improvements coming, dont rest on the wins, and ensure this app stays contemporary.
A few opportunities remain: bring back the upgrade list that US Air app had available, bring more functionality to the app rather than pushing you to the AA web interface within the app.
AronDan about American Airlines