I used Hotwire.com for the first time today for a last minute trip RDU-DEN-RDU this weekend. Most all fares were $1200 and up for a last minute buy. Priceline wouldn't budge for anything less than $300. Hotwire presented me with a $207 fare, all taxes and fees included. Incredible! You don't know which carrier or exact flight times until you buy, but it is guaranteed to be on one of these: American Airlines, America West Airlines, Continental Airlines, Northwest Airlines, United Airlines or US Airways. I wound up on UA. You don't get FF files or FF perks, but for a $1000 savings, I don't mind.