I was reading some of the ICAO findings of the Korean Air 007
shootdown, and I was struck by the fact that an intertial navigation
system on the 747 was used for much of the overseas flight. Of
course, this was 1983 and GPS was probably not used in civilian
aircraft yet, so I really shouldn't be surprised. Does anyone know if
INS is still used on civilian airliners, particularly on overseas
flights?