Cast your mind back some 15 years, Pratt & Whitney and Rolls-Royce had developed new engines primarily for use with the C Series (A220), which the market assumed would be produced under IAE and the engine variants that came after would be an option on wing for new A320 and 737NG deliveries. Boeing thought the same, it was logical. Then John Leahy grabbed hold of the idea and decided to wrong foot Bombardier and all of the other manufacturers by developing a new lighter aircraft to go with the new engine given that a major step change in aircraft design

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