The first Koolhoven aircraft to reach the Union of South Africa was a model FK.41, modified by Desoutter in the UK to a Desoutter Dolphin. It was the second production aircraft built by the Koolhoven factory in Holland and was purchased by Marcel Desoutter and registered G-AAGC. It was sold to the Air Taxi Company (Pty) Ltd. of Wingfield in Cape Town and was registered ZS-ADX. The aircraft featured prominently in the search for the famous Swiss pilot Carl Nauer, who went missing along the West coast of Africa in August 1933.