These questions always crack me up.
I'm only responding because it doesn't look like anyone else will (so far).
These questions (to me) are personal. It depends on the subject in question.
I mean, I presume your friend is interested in airlines due to the fact he's currently employed at one.
If the airlines are the goal, then go to the airline.
The thing is, we can't be too picky these days. Some of us should consider ourselves lucky to just be working.
Your friend is lucky to have a choice.
Good luck.