Looks like the days of BA flights to South Africa being offered on aircanada.com are coming to an end:
Air Canada and South African Airways starting 13DEC12 begins reciprocal codeshare service, on Canada – South Africa routes. Planned codeshare routes include the following.
Air Canada operated by South African Airways
Johannesburg – Cape Town
Johannesburg – London Heathrow
South African Airways operated by Air Canada
London Heathrow – Toronto
London Heathrow – Vancouver
The two also plans to expand codeshare operation via US points (New York JFK / Washington Dulles)
Source:
http://airlineroute.net