Just a heads up... AA seems to be really cracking down on this. Noticed this thread over on Reddit:
https://www.reddit.com/r/americanair...anned_from_aa/
I just wanted to give everyone some information on what not to do. I used a hidden city flight website to book my AA ticket at a lower price. I attempted to check in online before my flight, but I was presented with an error message. I came to the boarding check-in, and they informed me that if I didn’t reach my final destination, I would be banned from the airline.
According to that person, they claim this is only the second time they have done it.