American airlines has no clue. App updates differently than the website and the boards at the airport. Then the app won't let you make changes because why? Couldn't tell you. No one answers the customer support line (4+ hour wait) or their online chat (2+ hour wait). Started in Phoenix yesterday, canceled flight with no help or hotels, to then get on a flight to JFK only to get stranded yet again. All in an attempt to get to Chicago. No Apologies, no indication that they even care!