Right here:

Kenya Airways, one of Africa's top 3 carriers, and the biggest transcon operator.
UX for extra possibilities for transatlantic redemptions
China Southern Airlines, the biggest airline in Asia in terms of fleet size, and 2nd biggest in terms of pax carried, with 9 (!!!) hubs across China. They also fly to Australia, so more Skyteam options for getting there if you have to. (Joining in November)

Can't get much better than this! Having been Elite+ for 3 years, it's great to see that Skyteam has become useful for travelling pretty much everywhere. A S. American carrier is all we need now.