I guess with the answer to "Why do you want to fly?" everyone finds it hard to put something that the interviewer hasn't heard a hundred times already that day. I'm pretty sure that an interviewer will be expecting "I've wanted to do it since I could think, and I use to just stand in the garden and watch the planes..." and so you get stumped about what to say because you don't want to bore them. But then again, I think its far more likely that alarm bells will sound to the interviewer if you don't answer passionately about how much you want to fly, and they'll have second thoughts about how committed you are.
I have heard some advice about body language (such as altering the angle of you chair to the person that speaks to you) but there is one thing that really frightens me. Sweaty palms. I really don't want them, but know I will. How do you surreptitiously wipe them before you shake hands. Maybe a bit of tissue, will help.
642VGS Is that Linton?