Process details were pretty much described by everyone else. Prepare a unique and thoughtful question that doesn't involve salary. Stand when you read the flight attendant lines, and discuss how you might plan to further your career within the company.
One thing I didn't notice anyone mention was how extremely forced and fake the interactions with other interviewees was! Maybe it was the nerves of everyone, or the recommendations online by other interviewees to talk a lot and be "the popular one in the room", but whatever it was, RIDICULOUS can be the only way to describe it. When I walked into the small grey room with a large projection screen and rows of chairs, there were two rows of young women seated. They were laughing hysterically, fake laughing, nervous, loud, like "I have no idea what you said but I'm sure they're watching me and if I smile a lot and am loud, they are sure to notice me" type of laughter.... I consider myself to be an extremely genuine person. Genuinely nice. Genuinely friendly, caring, helpful, safety conscious, etc. Based off of my interview experience I would say that this is NOT what they are looking for. I was seriously thrown off by the extremely fake, annoying, and at times, plain rude personalities and behavior of the other interviewees. I had a hard time interacting with them, because they were all trying SO hard to be the one who talked, loudly and stood out. Try being observed while crammed into a room with a bunch of people who are trying to scream how awesome and well suited for the position they are... It was, to say the least, a very interesting human behavior observation for me...
A little advice to the employer: If you are choosing only those domineering and overbearing personalities, you are hiring too many of one personality type. Think of the environment you're creating with your interview process and what sort of responses that environment will elicit from interviewees. In this case, I'd have to say it was a disingenuous valuing type of interview process. The listeners and genuine personalities have a lot to offer any organization, especially commercial aviation, and the reasons for this I could elaborate on forever and ever. Not choosing someone because they refuse to push themselves over on others to appeal to you as an employee, means you are missing out on some of the best characteristics that human beings have to offer each other, especially in a customer service position!
After much time digesting this experience, I am extremely thankful that I did not receive an offer, because working with a surplus of fake, rude, and overbearing personalities is something that I want to steer very clear of... In the skies, or on the ground.
I'd say, if you're still interested in applying/interviewing after reading this, have a pot of coffee before you go in there, dress in a black or navy suit only, with conservative shoes, try to be the first one in (needed power play), sit in the second or third row, be ready to talk loudly about yourself for about 30 minutes to an hour and to pretend like you're having the time of your life despite the fact that everyone around you is trying to talk over you, make a couple of friends so that this won't be as bad for you (I sat in the front row and I guess no one else wanted to, so I was sitting in a row by myself and had to turn around to talk to others, which made it much more difficult).
Also, when I was called back to interview, someone in the interview room was sobbing in the background, so be prepared for anything. My interviewer was not as bubbly or reassuring as the others reported theirs to be, which is fine, but she was almost whispering the interview questions to me, so I followed suit and assumed we were trying to keep it down because of the open cubicle environment with other interviews going on simultaneously. After talking with the other candidates, I think this may have hurt me in the interview. During the role playing portion of the interview, she did not role play, but simply told me the scenario and expected me to act it out one sided. Other interviewees said they role played with their interviewer.