Adelaide and the City of Perth. They arrived in Perth on 29 May 1929 after flying the 1450 miles in 14 hours. Two aircraft were later sold to Imperial Airways and the remaining two were sold to Stephens Aviation when the airline was taken over by Australian National Airways. Operators West Australian Airways Adelaide Airways South African Air Force Imperial Airways Accidents and incidents On 6 September 1929 an Imperial Airways DH.66 Hercules, registration G-EBMZ, crashed on landing at Jask, Iran, due to pilot error, killing three of five on board. On 14 February 1930 an Imperial Airways DH.66 Hercules, registration G-EBNA, was damaged beyond repair during a forced landing in Gaza, Egypt. Specifications (DH.66A) See also References Notes Citations Bibliography The Illustrated Encyclopedia of Aircraft (Part Work 1982–1985). London: Orbis Publishing, 1985. Jackson, A.J. British Civil Aircraft since 1919, Volume 2. London: Putnam, 1974. . Jackson, A.J. De Havilland Aircraft since 1909. London: Putnam, 1987. 1920s British airliners 1920s British mailplanes Hercules Trimotors Biplanes Aircraft first flown in 1926