The Cameroon Airlines Corporation, trading as Camair-Co, is an airline from Cameroon, serving as flag carrier of the country, a role which was previously filled by the now-defunct Cameroon Airlines. Camair-Co has its headquarters in the Immeuble La Rotonde in Douala, and operates out of Douala International Airport.
When it was in operation, Cameroon Airlines had its headquarters in the Immeuble La Rotonde.    
The agent stated that Camair-Co. took over as flag carrier of the country from the now defunct Cameroon Airlines.  This means that Cameroon Airlines used to be, but is no longer in operation.  The context was not clear as to whether the headquarters of Cameroon Airlines were in the same location as Camair-Co. is now i.e. the Immeuble La Rotonde.  Therefore the above statement is neither definitely correct nor definitely incorrect based on the context.  The system may have found it difficult because the context did not specify the headquarters of Cameroon Airlines.  