Engine makers often look to fuel efficiency as the factor that sets their product apart from the competition, but that may not be the only way to entice customers. CFM’s LEAP engine and Pratt & Whitney's PW1000G, for example, are both surprisingly low maintenance. "While the flurry of new aircraft debuts represents an unprecedented period for both airframe and engine makers, the long-term winners may turn out to be those who put maintenance costs high on their checklist," writes Guy Norris.

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