The USAirways website may be winning awards, but the booking engine sucks. Any deviation, such as going back and modifying for things like different airports, or days, causes the thing to send you back to the beginning, with a dumb message about flights being "out of sequence". Sometimes it tells you the booking was unsuccessful, so you do it again, and discover you have actually made (and been charged for) two reservations on the same flights. Calling the airline results in the regular res people telling you they can do nothing with these. That's because the internet booking is contracted to Travelocity. The locaters are even different, and you end up with two...one from the site people, and the other from the company. Want to use this thing. Bring your lunch. You'll be a while.