Travel

More specifically it has to do with setting up a frequent flyer account, even if you aren't a frequent flyer. If you make your reservation and check in using a frequent flyer account, it will up your boarding priority. People without frequent flyer accounts board dead last.

It's also very worthwhile to use the app if you have a smart phone. Sometimes your gate assignment will change, even after you've arrived and gone through security. This happens more often when flights are delayed. The AA app will notify you immediately of any gate changes which can save you the trouble of going to the wrong gate only to find out you have to go somewhere else.