The firm is being asked to develop high-tech components for the plane, which is expected to be flying by 2008. The timing of the partnership announcement is regarded as highly significant. Doubts have been growing in the industry that the Sonic Cruiser, which will be capable of flying just below the speed of sound from London to Sydney, will ever be built. Boeing hopes the GKN deal will give the project more credibility. Rolls-Royce, based in Derby, is developing a new quiet, 'green' engine for the aircraft.