Boeing X-66

X-66
X-66 rendering showing its trussed high wing configuration
General information
TypeExperimental aircraft
ManufacturerBoeing
StatusCancelled
Primary userNASA
Number built1
History
Developed fromMcDonnell Douglas MD-90

The Boeing X-66 is an experimental airliner that was under development by Boeing. It is part of the X-plane series, that was being developed in collaboration with NASA and its Sustainable Flight Demonstrator program. It used an extra-long and thin wing design stabilized by diagonal bracing struts, which is known as a Transonic Truss-Braced Wing. The aircraft configuration was based on research studies referred to as "Subsonic Ultra-Green Aircraft Reach (SUGAR)" which extensively studied truss-bracing and hybrid electric technologies.

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