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If launched under its current conceptual specifications, say those familiar with the details, the 777-9X would yield a 21% improvement in per-seat fuel burn and a 16% improvement a cash operating cost per-seat over today's 777-300ER. Such jumps in efficiency are more usually reserved for clean sheet aircraft, and simply put, the long-range twin would be Boeing's most efficient jetliner ever developed, even exceeding the conceptual performance of its 787-9 and -10X.
The 407-passenger, 76.48m (250ft 11in) long 777-9X, a four-frame stretch of the 777-300ER, would likely lead the new family. It would be powered by two General Electric GE9X engines, each providing 99,500lb of thrust, and have a maximum take-off weight (MTOW) of 344t (759,000lb)."
see 777X
Last edited by Ian W; 3rd May 2013 at 23:44.