BAC-111 US Air airplane model. The One-Eleven can trace its origins back to the proposed Hunting H-107 jet airliner project of 1956.
British United Airways placed a launch order for 10 of the new jets, then known as the BAC-111, in May 1961. The new aircraft took to the skies for the first time on August 20 1963, while the first production Series 200 first flew on December 19 1963. Certification was eventually awarded on April 6 1965, following a troubled flight test program, during which one prototype crashed with the loss of its crew, the cause attributed to deep stall from the rear engine and the T-tail configuration. With the deep stall issue resolved, the BAC-111 entered service on April 6 1965.