This web site – http://www.avoiddelays.com/default.aspx – provides historical information about which airports have the most delays and what times are the worst times to fly.  I learned about this on the Perrin Post at Conde Naste traveler.  I also learned from that blog that “European hotel managers rated Americans their second-favorite customers, after the Japanese. Not surprisingly, we’re also considered the best tippers and the worst dressers.”