Really not a good time for the airline. Recently, they announced they were looking to sell their A340s. Hopefully these cuts will allow them to recover.
Probably because it either doesn’t have a high enough demand, they aren’t able to acquire the appropriate aircraft for the route or they don’t have the cash flow to keep the route afloat along with the aircraft serving the route (taking fuel costs, in-flight entertainment costs, aircraft maintenance costs, estimated amount of passengers that would be on this route and more into account).
Likely it went like AA and their ORD-PEK route where there was very little demand thus no need for the route opening unless they use an insanely efficient tiny plane.
While JNB-MUC may not have had much demand, AA’s ORD-PEK wasn’t cut because lack of demand but rather the Chicago to China market was flooded with capacity so AA couldn’t charge high enough fares and was losing millions by operating the flight.
Chicago is one of the largest U.S. markets from China.