I would say US Air, however my reasons were different;
1) Food sucks (ok so that one)
2) They have lost my luggage each time I have travelled with them
3) Flights are never on time
4) They do not mind if some guy jerks off next to you (or your friend), the stuward will only ask what you're doing that night if you complain.
I will never take that airline again EVER!
US AIR!