For anyone waiting to book airfare for May, I just booked our airfare with United. They were unusually cheap for some reason. Unsually they're one of the more expensive carriers, but for our family of 4 from Chicago, it was only $1200 total. Last year around the same time, airfare was about $2200 for the 4 of us on United. You might want to check them out. They would not have been my first choice due to the fact that normally they're more expensive. Maybe this isn't cheap and I just don't fly often enought to notice, but it seemed really cheap to me.