For the 100 years or so of air transport, the form factor of airplanes has been essentially consistent: a fuselage, usually cylindrical, with attached wings and tail. While relatively simple to build, with a good strength to weight ratio, aerodynamically, this form factor is not the most efficient.
Eliminating the fuselage and building the aircraft as a flying wing has long been recognized as a path to greater efficiency and performance, and since the late 1940s, multiple flying wing designs have been proposed. Very few have made it into hardware, but a form of hybrid concept, called the blended wing body, appears to be a practical way to reduce drag, and consequently fuel burn, and commercial aircraft.
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