Hawker Aircraft Limited was a British aircraft manufacturer that was responsible for some of the most famous products in British aviation history.

The Sopwith Aviation Company was a British aircraft company that designed and manufactured aeroplanes mainly for the British Royal Naval Air Service, the Royal Flying Corps and later the Royal Air Force during the First World War, most famously the Sopwith Camel. Sopwith aircraft were also used in varying numbers by the French, Belgian and American air services during the war.