FORGIVE ME IF THIS QUESTION HAS BEEN ANSWERED BEFORE BUT i JUST FOUND THIS SITE. I plan to non rev on a NW(not code share) flight before June 23.If the coach cabin is full, will I be able to get a seat in first if available and if so, is there a fee? Also, is there a checked luggage fee for non revs?Also, what is the dress code for first class? Are jeans allowed in first? Thanks for all replies.