How mobile-friendly is American Airlines?
American Airlines provides an iOS app that is compatible with iPhone, iPod, and iPad.
Also, if you're a member of American Airlines AAdvantage, you can manage your profile, view your points balance, and more.
American Airlines has an Android app that works with most Android tablets, phones, and some Android Wear devices. Perhaps standard practice these days, the Android app offers the same functionality as the iOS app from American Airlines.
If you're just looking for their mobile site, you can head on over to http://www.aa.com on your mobile device.