The first Viastra, registered as G-AAUB and powered by three 270 hp (200 kW) Armstrong Siddeley Lynx Major 7-cylinder radial engines first flew on 1 October 1930.
In between its tri-motor Lynx and Jupiter lives, G-AAUB flew for a time as a twin Armstrong Siddeley Jaguar VIc (470 hp (350 kW) 14-cylinder radial engines) powered Viastra III, otherwise similar to the Viastra II.