NBC’s "Dateline" examined Department of Transporation statistics for every month in the year 2000. They found that the best time to fly out of Detroit Metro with the fewest number of delays is early in the morning, from 6 to 7 a.m. or at the end of the day, from 11 p.m. to 1 a.m. The worst time for flight delays is in the evening from 6 to 8 p.m.
http://dailynews.yahoo.com/h/wdiv/20.../334775_1.html