Seems to price and be bookable for scattered dates through early next year at least. Sizeable layover in MAD, haven't tried to play with the routing.
https://www.google.com/flights/#sear...171;a=ONEWORLD
Can also be had with AA/BA on the outbound for just over $900
https://www.google.com/flights/#sear...171;a=ONEWORLD
Not an IB expert, but a pretty cheap way to get to S Africa.
Edited to add- Looks like good through May, and also works for other AA US hub cities, some for even less & on AA and BA metal. NYC, ORD, DFW all seem to have dates.