Kumasi International Airport (IATA: KMS, ICAO: DGSI) is an international airport in Ghana serving Kumasi, the capital of the Ashanti Region. It is the busiest airport on the Ashantiland Peninsula. Kumasi International Airport is located 6 kilometres (4 mi) from Kumasi.
Kumasi International Airport is the only international airport in Ghana.
There are definitely more airport in Ghana.  Kumasi just happens to be the busiest one located in Kumasi.  It would be difficult for the AI system because the context does not mention any other airports.