The most important RAS route flown was between London and Scotland (London-Birmingham-Manchester/Liverpool-Belfast-Glasgow). The trunk service commenced on 20 August 1934, using the airline's newly delivered DH.86 Express biplane airliners, which operated once daily in each direction. The service was mainly aimed at passengers wishing to connect at Croydon Airport with IALs flights to the Continent. RAS were unhappy with winter operations at Manchester's small airfield at Barton Aerodrome and the flights switched to the larger Liverpool (Speke) from the late October, resuming through Barton on 15 April 1935.