In September 1939, while war is declared, Vagn Christensen is working in London for Det danske Luftfartsselskab (the Danish Airlines). Following the German occupation of Denmark, he volunteers for the Royal Air Force. He is in service until 1 January 1946.
Hjalmar Lorens Tambour is trained as pilot in the Royal New Zealand Air Force flying in Italy in 1944.
During the Second World War, a large number of Danish pilots were in British or Norwegian air service. Though many were accepted in one of the Norwegian squadron, 234 (Madras Presidency) Squadron is by far the most 'Danish' of all squadrons of (or associated to) the Royal Air Force. In all nine Danish pilots and three Spitfires is in 234 service.
In October 1941, a Spitfire Fund was set up to collect funds for a number of Danish Spitfires. The result of the collection was presented to Prime Minister Winston Churchill in 10 Downing Street on 9 April 1942.