 The first was powered by 347 kW (465 hp) Bristol Jupiter VI radial engines and the second, an improved model, the F.XIIM, was about 20 km/h (12 mph) faster than the Dutch-built F.XIIs.Ten aircraft were ordered by KLM/KNILM for operation on the Amsterdam to Batavia route.The first service left Amsterdam on 5 March 1931 arriving in Batavia on 14 March 1931.