Question: What airline headquarted in Immeuble La Rotonde in Douala took over Cameroon Airlines Corporation in March 2008?
Sentence (from "Cameroon Airlines"): Based in Douala, it operated scheduled services within Africa, as well as to Europe and the Middle East out of its hub at Douala International Airport, with a second network focus on Yaoundé Nsimalen International Airport.
Relevant evidence: No