United has South America to Africa flights for only 45k in J, which is very reasonable. It's only available if you fly direct, and not via the EU or US. The only two direct flights are JNB-GRU and ADD-GRU. But you can build around that on either end. United is a UR partner. Space should be visible on united dot com, although the short hops in South America I'm not sure about booking online.