X-66 Sustainable Flight DemonstratorNASA and Boeing are partnering to build and fly the X-66 Sustainable Flight Demonstrator, seen here in this artist concept.Image Credit: NASA / Boeing Facebook Pinterest X LinkedIn Email https://www.nasa.gov/image-detail/x-66-in-sky-updated/Copy URL to clipboard> DownloadShareTagsAeronauticsSustainable Flight DemonstratorImage CreditNASA / BoeingSize2880x1915px