So, anybody who knows even the slightest thing about history are more than aware of Apartheid in South Africa. Consequently, South African airlines were barred from flying to other African nations and (as far as I know) other airlines on the continent were either barred from flying to South Africa, or there was simply not a market. Also, the US prevented South African registered aircraft from flying to it after 1986.
I propose we include political restrictions in game to reflect this, ending around 1990 with the abolition of Apartheid. Could probably work in the same way that Taiwan-China restrictions do (which I think end in 2008 in-game, not 100% on that).
But yeah, thoughts?