edge, Loki is busy into south Sudan, and as mentioned a lot of $$ pouring in in the next couple of years and will get busier.
Combination of UN contracted ops and ad hoc charter companies. Safair, Rossair, Trident, Queensway ( I think ) and some others on UN work. Try 748 Services, Turbine Air services, Trackmark, ACS who are ad hoc. Lots more popping up as you've heard. Most have NBO offices.
The flying's great, interesting strips... Never really had a prob but good to be polite to guys with AKs.
Loki is busy and a good crowd, always cold Tusker ( or Castle if you have to ) Several daily flights to NBO to stock up on sanity.
A/C types: C130s, Buffalos, lots of Vans, Let 410s, various Antonovs, Twotters, DC3s with Rossair, coupla King airs and 1900s. Combination 5Y and ZS registered.
Enjoy.