Question: The Airco DH.9 was named after which British aviation pioneer?
Sentence (from "Airco DH.9"): 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.
Relevant evidence: Yes