From secret projects to damaging delays and changing loyalties, it has been a busy, and sometimes turbulent, few years for the business jet engine manufacturers. Four of the big six – GE Aviation, Pratt & Whitney Canada, Rolls-Royce and Safran – have new programmes in advanced development or final stages of flight testing, while Honeywell and Williams International have latest versions of their powerplants on recently-certificated aircraft. This is our update of progress so far.
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