SAA
I have no idea how long they have been doing that route,but I understand from fellow-travellers (I have been flying between the US East Coast and SA for over 20 years) that a very large percentage of potential customers would actually prefer NOT to fly to Johannesburg and then connect to Cape Town------they would much prefer to fly to the Mother City direct from the US,or at least have the option.I think SAA used to do that from Miami long ago and I enquired recently whether Delta were considering the route,but nothing seems to be happening.A friend so dislikes deplaning in Johannesburg that he flew from JFK to Dubai with Emirates and then with Emirates straight to CPT.He says that it was an excellent experience.
SAA would benefit from some cabin-crew training,in my opinion.The crew are really charming & pleasant,but the chattering and laughing all night in the galley is not on.