1) All copyrights of winning photos will belong to Korean Air.
Why spoil the...
fun with that?
You miss the point of the contest - the contest system is set up so that it's essentially participants vying for a contract, the best contestant submits a photograph they can use for advertising etc. and not pay royalty fees, and in exchange the participant gets round trip tickets (which do have some value in them, but of course are easier for the airline to pay out).
Which is why I avoid all this crap.