Despite struggling to launch the 787 Dreamliner, Boeing is looking to debut an even more ambitious jet in 2020: the 777X, a twin-aisle, twin-engine jet that's built around fuel efficiency. Boeing says that the jet — which will be renamed before its final release — uses 12 percent less fuel than any competing aircraft and 20 percent less fuel than today's 777, which the 777X is based on.
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