Hello Shawn,
first way can be the routenet. You can find it at the dispatch centre. The routenet has a field on the top right corner, where you can add the airport, where you want to fly from. After that you can see all destinations from and to your choosen airport.
Second way can be the combined search - that can be found at the dispatch centre/ flight search too. In the headline, where you can add the filter items you will find a triangly at the bottom left of the blue field. By clicking onto it the headline will expand and a checkbox combined search appears. By klicking the box you are able to add more than one search criteria. So you can choose your aircraft and a destination.
But it looks like, that there are no ATR's at the HUB in Southafrica.
So the only way you have is to make a charter flight with the ATR. There are 5 ATR's available for charter flights. It doesn't matter where these plane current position is (as long as you have choosen the basic career mode (further information can be found in our pilots manual...
If there are any other questions, do not hesitate to write them here...and by the way...
WELCOME at the AirChild