Back in the early 2000s BA used to operate services to the African oil city of Hassi Messaoud. A random guess would say they used the Boeing 737-400 on that route, as they used the same aircraft on many of their North-Central African routes at the time, e.g. Marrakech-Manara, Algiers-Houari, Tripoli-International, Monrovia-International, etc. Does anyone have any other info on this now terminated route?