The Butzweilerhof was the civil airport of Cologne. It was established as a training airfield in 1912 and saw airline service from 1922 until the 1950s. It was replaced by the Cologne Bonn Airport. The airport buildings from 1935-36 are listed monuments and a rare example of airport architecture from the Interwar Period. From 1951 to 1967 it was operated by the Royal Air Force as RAF Butzweilerhof.