page_title: Airco DH.9
section_title: Military operators
hierarchical_section_title: Airco DH.9 / Operators / Military operators
caption_attribution_description: English: De Havilland DH.9 taken from Greeks, August 23, 1921
context_page_description: The Airco DH.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.
  The DH.9 was a development of Airco's earlier successful DH.4, with which it shared many components. These were mated to an all-new fuselage and the BHP/Galloway Adriatic engine, which promised increased performance. Anticipating its usefulness, the type was ordered in very large numbers for Britain's Royal Flying Corps.
  Upon entering service, the DH.9's performance was found to be unsatisfactory. The Adriatic engine was unreliable and failed to provide the expected power, which gave the DH.9 poorer performance than the aircraft it had been meant to replace. The performance deficit was blamed for the heavy losses they suffered over the Western Front. The redesigned DH.9A was fitted with a more powerful and reliable American Liberty L-12 engine which rectified the shortcomings of the original DH.9 model.
context_section_description:  Afghanistan
  Afghan Air Force – 18 aircraft, including 16 built by Duks Aircraft Works, acquired from 1924.
   Australia
  Royal Australian Air Force – One used by the RAAF from 1920 to 1929.
  No. 1 Flying Training School RAAF
   Belgium
  Belgian Air Force – 18 aircraft.
   Canada
  Canadian Air Force
   Bolivia
  Bolivian Air Force
   Chile
  Chilean Air Force – Received 20.
   Estonia
  Estonian Air Force operated 13 from 1919 to 1933 .
   India
  (Part of Imperial Gift)
   Greece
  Royal Hellenic Naval Air Service
   Kingdom of Hejaz
  Hejaz Air Force – The Kingdom of Hejaz received 9 DH.9s and 2 DH.9Cs between 1921 and 1924. Five remained in existence (although not airworthy) in 1932.
   Ireland
  Irish Air Service
  Irish Air Corps
   Latvia
  Latvian Air Force
   Netherlands
  Royal Netherlands East Indies Army Air Force – operated 36, some of which were re-engined with Pratt & Whitney Wasp radial engine withdrawn in 1934.
   New Zealand
  Royal New Zealand Air Force – Three Airco DH.9s in service with the New Zealand Permanent Air Force from 1923 to 1929 as advanced training aircraft.
   Paraguay
  Paraguayan Air Force
   Peru
  Peruvian Air Force
   Poland
  Polish Air Force – 20 received in 1920, used during the Polish-Soviet war, until 1929.
   Romania
  Royal Romanian Air Force
   Kingdom of Spain
  Spanish Air Force
   South Africa
  South African Air Force – Part of the Imperial Gift. Some locally modified with Jupiter engines and named Mpala.
   Soviet Union
  Soviet Air Force
    Switzerland
  Swiss Air Force
   Turkey
  Turkish Air Force – four aircraft, in service from 1921 to 1924.
   United Kingdom
  Royal Flying Corps
  Royal Naval Air Service
  Royal Air Force
   United States
  American Expeditionary Force
  United States Marine Corps
   Uruguay
  Uruguayan Air Force
caption: Turkish DH-9
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