The British DH.4 was one of the best light bombers of WWI. A huge number were built in the USA in 1918. This airframe was rebuilt for the US Post Office by Boeing in 1923. It was later owned by movie stunt pilot Paul Mantz.

The DH-4 was a 1917 RAF day bomber. Examples sank German submarines and shot down Zeppelins at up to 16000 ft. 4,587 were US-built, mainly with Liberty engines, for service with the Army Air Service in Europe. Postwar the DH-4 remained in US military service until 1929. No.166 was one of over 100 upgraded DH-4Bs used postwar on transcontinental airmail routes by the USPO. 400 lbs of mail was carried in a compartment replacing the forward cockpit. From Douglas A/c.