AWS has common Caribbean, European, and trans-Tasman common aviation markets.
How about implementing the common African aviation market?
https://au.int/sites/default/files/newsevents/workingdocuments/33100-wd-6a-brochure_on_single_african_air_transport_market_english.pdf
By quick look, this does not give airlines the rights to operate within other countries (like in EU), so not something that would be directly useful for the sim.
However since Africa is rather unrepresented anyway, I'll investigate a bit more and see if there would be grounds for a playability expection vs real life.