In 1959, Lord Douglas, chairman of British European Airways (BEA), suggested that Boeing and de Havilland Aircraft Company (later Hawker Siddeley) work together on their trijet designs, the 727 and D.H.121 Trident, respectively.
En 1959, Lord Douglas, xefe de British European Airways (BEA), suxeriu que Boeing e de Havilland Aircraft Company (posteriormente Hawker Siddeley) traballasen xuntas nos seus deseños de trirreactores, o 727 e o D.H.121 Trident.