Civil aviation accidents in the U.S. fell by 8% in 2004, according to the National Transportation Safety Board. The number of fatalities fell from 695 in 2003 to 635 last year. Most of the deaths in 2004 involved private planes or air taxis. One observer said the number of accidents has declined because pilots flying the planes are more experienced. Many military pilots have entered the pilot market, and they are trained to fly in all types of weather.