Avionco is questionable at best. I know several pilots who are waiting for final checks for over 2 years. The delay for them is that the company that contracted with Avionco did not pay Avionco so Avionco did not pay the pilots. This too could happen on this deal. Just pretty "iffy", plus, if you are American the State Dept has warnings out that Americans should not go to these two countries. If you go, and get stuck the US will not help you get out. I would not go without at least $2000 available. No ATM's in some of these countries, credit cards not accepted, travlers checks may not be accepted either. These are things that should probably be asked of Avionco. Also, you need your shots...you do not want to get them when you land in Sudan......check the internet for what shots are required...I would guess teatnus, yellow fever, meningitis and a few others.