The South African airways flight was only a tech stop for fuel out of Jburgh going to ATL. SA would stop in Cape Verde for fuel, no one was allowed off the airplane and others weren't allowed to board. But, security was always sure to bring the dogs onboard to search the aircraft while fueling. You have to go Lisbon, then on to the states. Spent time in Cape Verde for a crew swap, wasn't rested when the jet got there, not as bad as what I am reading about Lagos, but definitely not comfortable. Look into the history of Cape Verde and what its financial support historically has been. I have a friend who has been every where in his career flying Gulfstreams. Asked him where the worse place he has ever been for work, with out flenching Lagos came out and claimed it was "hell on earth" and refuses to go there ever again. Check to make sure your insurance coverage will cover Lagos, worldwide does not mean everywhere, ie there are about 10 specific places it does not cover and I believe Lagos is one of those.