The design space remains wide open for a potential second stretch of the 737 MAX family to counter the Airbus A321neo, Boeing says, but as assembly of the first 737-9 nears, the manufacturer appears to be leaning toward a simpler, lower-risk derivative. Earlier this year Boeing outlined studies of a longer-fuselage MAX version dubbed the 737-10X that may be powered by a derivative of the larger-diameter CFM Leap 1C developed for the Comac C919. However, the concept requires a redesign of ...

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