It's ridiculous that they are asking that question to anyone interviewing today. If you say you wouldn't leave you're lying and if you say you would you probably won't be hired. I answered truthfully and said at this point in time (then) I wouldn't leave. With today's order book, today's contract, delta and uniteds current contracts there is no way I could answe that truthfully. As a new hire it's a no brainer.
The question is just routine for them and they need to stop asking it.