Be sure to look them in the eye when talking with them.
In the lobby waiting for your interview, be friendly and talkative. A lot of times they have AA personnel out there posing as interviewees etc. to see who is outgoing and friendly.
Have all paperwork ready, done neatly and have it all in some type of folder.
They may ask you 'why' you want the job?
EVERYONE says, I love people and the travel.
Think of something creative, peppy and original.
Best of luck.
Also, it is only the Flight Attendants who are known as sky nAAzis! <_<