@Bonnenouvellejohnny - This is one of those things in Korean that isn't quite obvious. A native can likely explain it better, but in my experience this has a similar meaning to "right?" or "you know?" It isn't actually a question, so don't be fooled by the question mark. I'd roughly translate this short exchange as follows (to hopefully give you a better sense of the meaning):
"From what I've heard, there are people who work at airlines, right? (Right) I heard those people can get plane tickets really cheaply. (I see) From what I know they can travel very cheaply."