"Hi! I"ve just been invited to attend an "informational session" at XYZ Airlines that"s being held next Saturday. I sent them my resume a couple of weeks ago. Is this an interview? Is there anything I should know?"
It"s very difficult to get to the interview stage, don"t blow your chances when you do. Don"t be scared, just go prepared! Nowadays, employers often ask questions designed to discover how would you deal with certain situations and would you behave. Companies want to know about your abilities and track record, not just your knowledge and experience.