I too just returned from Africa. the same route as Jim with no problems, even had a PVC tube that was 66" long, two pieces of 4" fastened together for arrows and longbows. No hassle from anyone at either Delta or South African air.
I did have something that appeared odd, and a total waste of Tax payers money. On our return flight to the US we stopped at Cape Verde Island for a crew change and fuel, at like 2 AM all of the passengers were asked to remove all of there carry on luggage from the over head bins and under their seats, return too the seats with all of this luggage in their laps, and were told that US immigration people were comming on board. Shortly afterward two men in US immigration uniforms came on board, they walked down each isle and looked in the luggage bins and left. They could not find anything in the bins,"I can't understand why"