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In a groundbreaking collaboration, NASA and Boeing have introduced a pioneering aircraft that holds the promise of safeguarding our planet. The experimental plane aims to contribute to achieving net-zero aviation emissions in the United States by 2050.

Under a substantial $725 million agreement, Boeing will spearhead the construction, testing, and flight of a full-scale demonstrator aircraft featuring extra-long, slender wings supported by diagonal struts. This innovative concept, known as a Transonic Truss-Braced Wing, has the potential to revolutionize the future of sustainable single-aisle aircraft—a vital component of passenger airline fleets worldwide.

In a significant recognition of its importance, the U.S. Air Force has designated the aircraft resulting from NASA’s Sustainable Flight Demonstrator project as the X-66A.

NASA Administrator Bill Nelson expressed the agency’s dedication to aviation advancement, stating, “At NASA, our vision extends beyond the stars. The Sustainable Flight Demonstrator will shape the future of aviation—a new era where aircraft are environmentally friendly, cleaner, quieter, and offer fresh possibilities for both the flying public and American industry.”

The X-66A is the first aircraft designed explicitly to help the United States achieve the ambitious goal of net-zero greenhouse gas emissions in aviation.

Bob Pearce, Associate Administrator for NASA’s Aeronautics Research Mission Directorate, emphasized the significance of transformative aircraft concepts, such as those being developed for the X-66A, in attaining the objective of net-zero aviation emissions by 2050. Pearce made this announcement during the American Institute of Aeronautics and Astronautics Aviation Forum in San Diego.

He added, “We are striving to demonstrate energy-saving and emissions-reducing technologies that will reshape the aviation industry.”

The Air Force assigns X-plane status to development programs focused on creating revolutionary experimental aircraft configurations. Typically intended for research purposes, X-planes test designs and technologies that can be implemented in other aircraft models, rather than serving as prototypes for full-scale production.

Boeing Chief Technology Officer Todd Citron stated, “The X-66A will continue the tradition of experimental aircraft that validate breakthrough designs, transforming the aviation industry. By applying the knowledge gained from design, construction, and flight testing, we will have the opportunity to shape the future of flight and contribute to the decarbonization of aerospace.”

The X-66A aircraft will validate the Transonic Truss-Braced Wing configuration alongside advancements in propulsion systems, materials, and systems architecture. The successful integration of these innovations could potentially reduce fuel consumption by up to 30% and result in significantly lower emissions compared to current best-in-class aircraft.

Given the extensive use of single-aisle aircraft, which currently account for nearly half of global aviation emissions, developing designs and technologies for a more sustainable iteration of this aircraft type could have a profound impact on reducing emissions.


As part of the Sustainable Flight Demonstrator project, NASA has entered into a Funded Space Act Agreement with Boeing, committing $425 million over seven years. The remaining funding, estimated at around $725 million, will be provided by Boeing and its partners. NASA will also contribute technical expertise and access to facilities.


The unveiling of this revolutionary aircraft marks a significant step forward in the pursuit of a greener and more sustainable aviation industry. With the collaboration of NASA and Boeing, the dream of cleaner, more efficient, and eco-friendly aircraft is taking flight, offering hope for a brighter future for both air travel and the environment.