This is a combination of British Airways business (I) and first (A) fares, from Vancouver to Cape Town and back to Dallas, via London each way. (An all-business itinerary is
$3,017. An all-first itinerary is
$4,321.)
Departure can be from YYZ/YUL as well, and arrival can be to other US cities for a bit more. Two stopovers are permitted for free. Book by June 14.
Example: