The world let South Africa manage the first aliens to come here?
Seriously, what a ridiculous premise. South Africa is a pathetic basket case of a country. First contact with an advanced alien species is administered by them? Even if the ship is in their airspace, who cares? America, Nato, or the world in general would have conquered their sorry asses if it came down to it just to keep their bumbling hands off the most important development in all of human history.
The way South Africa is depicted in the film just reinforces my premise. Their is just no conceivable way that the rest of the world would let these corrupt, hamfisted turds come near the aliens, let alone run the show. Odds are the UN would annex that area of South Africa into international territory and then give them service contracts for the operation to shut them up. Beyond that, its not like they would have much of a choice.