Longshot – you are right when you say Kano was not on the route to South America. The airlines and aircraft that came through Kano were either on their way to Lagos and sometimes Accra or going directly South towards the Congo and South Africa. I don’t know what KLM were flying in those days but they have had a long time presence at Kano and I think they still fly there now. It could have been as you say a Shell charter as it seems a small aircraft to be flying such a long route from Amsterdam.