In the early morning of September 13, Lin Biao, Ye Qun, Lin Liguo, and most of the other major plotters attempted to flee to the Soviet Union and boarded a prearranged Trident 1-E, (a CAAC B-256) piloted by Pan Jingyin, the deputy commander of the PLAAF 34th division.
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The aircraft involved were British Airways Flight 476, a Hawker Siddeley Trident 3B en route from London Heathrow Airport to Yeşilköy International Airport, Istanbul, and Inex-Adria Aviopromet Flight 550, a Douglas DC-9-32 en route from Split Kaštela/Resnik Airport, Yugoslavia, to Cologne Bonn Airport, West Germany.
Xian H-6I — Modified version powered by four Rolls-Royce Spey Mk 512 turbofan engines, originally purchased as spare engines for Hawker Siddeley Tridents in service with CAAC.