Q. I've read that the best time of the week to buy airfares is Tuesday. What hour of the day on Tuesday is ideal?

A. Actually, Airfarewatchdog.com doesn't subscribe to the "Tuesday is fare day" theory. We're writing this on a Friday on which several airlines announced new sales, and United launched some amazing unadvertised fares for $160 round-trip coast to coast (that's with tax). The best day to buy fares is when they hit rock bottom on the route you want to fly, and that could be any minute of the week. Sign up for free fare alerts and you'll have a better chance of nabbing a deal.