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In page Airbus A310:

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From late 1977, prior to the Varley announcement, BAe had already commenced work on the design of the new wing at its facility in Hatfield. However, due to negotiations with Britain on its return to the Airbus consortium being protracted, alternative options were explored, including potentially manufacturing the wing elsewhere.[1] At the same time as the British efforts, French aerospace firm Aérospatiale, German aircraft manufacturer Messerschmitt-Bölkow-Blohm (MBB), and Dutch-German joint venture company VFW-Fokker were also conducting their individual studies into possible options for the wing of the prospective airliner.[citation needed]