This rumour is a non-starter! Comair are forbidden to conduct long haul flights, they would require the express permission of BA in London. I am sure that it wouldn't be a problem although I would find it difficult to see how they could get rights, SAA and Nationwide will put up a big big fuss to the extent that Comair would be barred from codesharing with BA on the route which they would have to fly under an MN number. In that case I find it difficult to see how BA would agree to it!