BAC One-Eleven BAC One-Eleven The British Aircraft Corporation One-Eleven, also known as the BAC-111 or BAC 1-11, is a British short-range jet airliner used during the 1960s and 1970s. It was the second short-haul jet airliner to enter service, following the French Sud Aviation Caravelle. The aircraft was also produced under licence in Romania during the 1980s as the Rombac One-Eleven. The One-Eleven was conceived by Hunting Aircraft and developed by the British Aircraft Corporation when Hunting merged into BAC along with other British aircraft manufacturers in 1960. The One-Eleven was intended to replace the turboprop Vickers Viscount on short-range routes. The
Vickers Valiant deterrent to the Soviet Union from acts of aggression in Europe. In April 1948, the Air Staff issued a specification with the designation B.9/48 written around the Vickers design, which was given the company designation of Type 660; an 'Instruction to Proceed' was received by Vickers on 16 April 1948. In February 1949, two prototypes of the aircraft were ordered. The first of these was to be fitted with four Rolls-Royce RA.3 Avon turbojet engines, while the second was to be fitted with four Armstrong Siddeley Sapphire engines as the Type 667. On 18 May 1951, the first prototype, serial