Here is some good info: http://www.seatguru.com/airlines/Delta_Airlines/Delta_Airlines_Boeing_777-200ER.php
for curiosity's sake, I looked at flying from Mississippi and picked September.As an alternative: check out emirates.
They fly from other U.S. Locations to Dubai and then on to Jo'burg.
Reasons they seem to rock:
1.) top 5 airline globally
2.) miles can be exchanged for miles on Alaska air that can then be redeemed by lots of US carriers
3.) cheaper flights
4.) business class tickets are the least expensive anywhere, often the price of maybe 150% of coach, not 500%
5.) their flights often work out so you don't have to overnight in Jo'burg
6.) no connections in Dakar where there is a chance of Ebola causing a flight cancellation due to pandemic
Haha....I am hoping Riflepermits.com get me through there so fast I won't have time to count them all!