It's not just Boeing that's causing acute headaches for airlines. Pratt & Whitney's geared turbofan engine, which has been in operation since 2016 on Airbus single-aisle aircraft, has serious issues with reliability and durability, and a seriously long MRO timeline. The engine itself is an innovation — a major leap in fuel efficiency, which will only become more necessary — but will these issues threaten Pratt & Whitney's comeback? Make airlines more risk-averse when innovation is sor...