As the Second World War ended, on 7 May 1945, No. 4 Group RAF was transferred into the command, from Bomber Command, but disbanded in early 1948; No. 48 Group RAF was established, but then disbanded on 15 May 1946; and No. 216 Group was transferred to RAF Mediterranean and Middle East. The Command took part in several big operations, including the Berlin Airlift in 1948, which reinforced the need for a large RAF transport fleet. The Handley Page Hastings, a four-engined transport, was introduced during the Berlin Airlift and continued as a mainstay transport aircraft of the RAF for the next 15 years. In 1956, new aircraft designs became available, including the de Havilland Comet (the first operational jet transport), and the Blackburn Beverley. In 1959, the Bristol Britannia was introduced.