Africa is not an easy market.
Not a very big trafic
Leisure markets limited to some destinations. From Italy and East Europe, there are plenty seasonnal flights to Africa, only for leisure markets, so no need to fly thru BRU, CDG or AMS.
"High'' VFR market mainly in the summmer and probably during the Christmas
Stiff competition on premium market.
During many years US or UE airlines have been sent some aircraft with the oldest configuration, but with the arrival of ME3 and Turkish Airlines in Africa, they have changed their mind. All last brand new aircraft (A350, B787) from British Airways, Lufthansa, Air France or KLM are now or will be used to Africa. Also their last retrofited aircraft.
Competition is very stiff, from Royal Air Maroc and Ethiopian Airlines & Kenya Airways (even if they are in SkyTeam and they have a JV with AF KLM) has added routes to Geneva, Rome and New York.
If Qatar Airways or Turkish Airlines provide better fares, to Africa, people will fly with QR or TK, even if Brussels Airlines or Air France brands are strong, it's not like in 1990s.
As of July 2019, Africa is the only market, where Air France KLM is losing passengers
July 2018: 513 000 pax
July 2019 : 494 000 pax
Jan-Jul 2018: 3 193 000 pax
Jan-Jul 2019: 3 134 000 pax
https://www.airfranceklm.com/fr/system/ ... f_vdef.pdf