I am moving to Nairobi, but I will traveling around the continent of Africa 50-70% of the time. Obviously, I will be taking Kenya Airways majority of the time, but I will also be taking Ethiopian Airlines and South African sometimes. I will also be taking Lufthansa and Swiss to get to Nairobi from Boston.

I am debating between US Airways, Continental, United, but also am curious about South African and Ethiopian. I really have not found much feedback about the later two on Flyertalk. I also am unaware which fare classes I will be booked in for work.

Any advice would be helpful, thank you.