Question: The Airco DH.9 was named after which British aviation pioneer?
Related documents: [0]  [DOC] The Airco DH.9 (from de Havilland 9) – also known after 1920 as the de Havilland DH.9 – was a British single-engined biplane bomber developed and deployed during the First World War. [END] 
[1]  [DOC] Captain Sir Geoffrey de Havilland (27 July 1882 – 21 May 1965) was a British aviation pioneer and aircraft engineer. His Mosquito has been considered the most versatile warplane ever built, and his Comet was the first jet airliner to go into production. [END] 
Answer: 
Captain Sir Geoffrey de Havilland
Captain Sir Geoffrey de Havilland