You don't specify when you are going...which makes a world of difference in strategy. You may consider buying a rntp to London (remember,though, BA transatlantic does not accumulate miles on Aadvantage) and using your miles to Kenya.
I will give you an example.
I am going to Nairobi at the end of November 2004. Mileage on CO (including NWA/KLM) was 90,000 from the US, but I had to fly thru New York. (I live in Dallas)
So, I finally booked an AMS-NBO mileage ticket for 50,000 miles (CO miles)and $50 tax and I will fly CO DFW/AMS via Houston for $580 rntp and I get double miles for elite status. I will get roughly 23,000-24,000 miles rntp on my pay ticket.
FInally, I end up using only about 26,000-28,000 miles from my account, pay a little over $600 total, get a stopover in Holland, instead of paying $2000 for a rntp DFW/NBO.