A Degree And A Half Routing Error

*ILLUSTRATION*

On October 31, 1983, a Korean airliner departed on a flight from Anchorage, Alaska to Seoul, South Korea.

Unknown to the flight crew, the flight navigation system computer contained a degree-and-a-half routing error.

At the point of takeoff it was unnoticeable, but as the 747 flew over the Pacific, it increasingly strayed off course, eventually into Soviet air space.

Soviet radar spotted the plane and sent fighter jets to intercept it, and over mainland Russia, the 747 disappeared and all those on board lost their lives.