Sheep
Angola is hard work but a lot of fun and the flying is good!
Zimex operate twin otters on contract to Sonangol - the national oil company. Mostly on coastal routes although since the end of the war I have heard them inland as well. They are on the Angolan register (D2-) and I would imagine Zimex will organise a validation for you.
I think the crews are well looked after - important in Luanda
I can try to put you in touch with somebody over there if you want.
The website for Rossair is
www.rossair.co.za
Cheers for now
JD