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One of Boeing's advanced vehicle concept designs aims to for better aerodynamic efficiency, creating as little drag as possible. Similar to the wing design of their X-48, an unmanned aerial vehicle (UAV), this design differs in its placement of the Pratt & Whitney geared turbofan engines on the top of the plane's back end, with two vertical tails to shield the ground from engine noise. This design is built using additional technologies to reduce noise and drag, along with long-span wings to improve fuel efficiency, and could potentially go into production by 2025.
