BEA's Super One-Eleven division on 1 April 1973 when the latter's One-Eleven 500s began replacing Scottish Airways Viscounts and mainline division Tridents. In November 1972, BEA ordered two Short Skyliner turboprops, a 19-seat deluxe all-passenger version of the Short Skyvan utility aircraft, to replace the ageing Herons. Following BEA's last scheduled Heron service from Barra via Tiree to Glasgow in March 1973 and successful route trials of the new Skyliners, which wore a modified BEA "Speedjack" livery incorporating dual BEA/British airways titles, the latter debuted on BEA's Scottish internal services from Glasgow to Barra and Campbeltown. BEA's Skyliners were intended to replace the airline's Herons as air ambulances as well; however, when Glasgow-based independent air taxi, charter and regional scheduled operator Loganair assumed responsibility for the Scottish Air Ambulance Service on 1 April 1973, the Skyliners had yet to enter service. This turn of events therefore marked the end of BEA's air ambulance services in Scotland after 25 years' continuous operation. On 31 March 1974, the British Airways Board placed an order for two British Aerospace 748 Series 2B turboprops for delivery to British Airways in 1975. These were intended to replace ageing Viscounts on the Scottish routes the new airline would inherit from BEA the following day, as well as for use on North Sea oil exploration flights. Channel Islands BEA acquired a presence in the Channel Islands as a result of the takeover of Channel Islands Airways on 1 April 1947. Channel Islands Airways was the holding company and successor of pre-war independent scheduled airlines Jersey Airways and Guernsey Airways. It was also among the independents that were absorbed into BEA following their nationalisation which began earlier that year. BEA commenced its services in the Channel Islands in 1947, using Dragon Rapides inherited from its independent predecessors. Following the transfer of BEA's London–Jersey route from Croydon to Northolt on 21 April 1947, DC-3s began replacing Rapides on most services. By 2 November 1947, all of the corporation's London–Guernsey flights had moved from Croydon to Northolt as well. In 1949, BEA expanded its fledgling Channel Islands operations by inaugurating London–Alderney and inter-island scheduled services linking Jersey, Guernsey and Alderney. On 28 April 1950, BEA launched a summer service from Gatwick to Alderney, the airline's first scheduled route from Gatwick as well as its first scheduled service from there to the Channel Islands. Additional scheduled services from Birmingham and Manchester