NASA Boeing X-66A Sustainable Flight Demonstrator Transonic Truss-Braced Wing
Originally known as the Sustainable Flight Demonstrator Project, this transonic truss-braced wing design aircraft is now known as the NASA x Boeing X-66A. This experimental aircraft aims to create a more sustainable single-aisle aircraft and to achieve this, the two agencies will build, test, as well as fly a full-scale demonstrator aircraft with extra-long, thin wings stabilized by diagonal struts,



This project marks the first X-plane designed exclusively to focus on helping the United States achieve the goal of net-zero aviation greenhouse gas emissions. It’s planned to fly in 2028 and results of its flight tests will help inform industry decisions as to the design of new production single-aisle aircraft for the 2030s.

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At NASA, our eyes are not just focused on stars but also fixated on the sky. The Sustainable Flight Demonstrator builds on NASA’s world-leading efforts in aeronautics as well climate. The X-66A will help shape the future of aviation, a new era where aircraft are greener, cleaner, and quieter, and create new possibilities for the flying public and American industry alike,’ said Bill Nelson, NASA Administrator.

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