don't really have problem with AA. have been using AA since 2004...4 years dy and all I can say is AA really improved a lot.
nonetheless, there are still some 'bad experiences' that i encountered.

1) People are too kiasu. 30 minutes before the announcement of boarding, people already line up in front of the door. What's the point. The seat won't run away. Confirm got enough seat for you. I always got to see where I wanted evetually - in the middle of the plane so I can see the 'wing'.

2) AA is famous for delaying. I remember almost everytime I can predict it will be 2 hours later than the actual boarding time. But there's one day I was delayed 2 or 3 times in a single flight.

3) AA's seat too hard...Not like MAS's....so comfortable.

4) AA's air stewardness...should learn from MAS's air stewardness how to make up la.

5) Got one time it was raining cat and dog at the airport...pilot didn't dare to land...ended up going round and round above the sky for 1/2 an hour... then announce to us the fuel was almost empty.....some people got panicked lol.