NASA Wind Tunnel Tests Lockheed Martin’s X-Plane Design for a Quieter Supersonic Jet

https://www.nasa.gov/press-release/nasa-wind-tunnel-tests-lockheed-martin-s-x-plane-design-for-a-quieter-supersonic-jet

https://www.space.com/37361-nasa-supersonic-aircraft-passes-design-review.html

http://zerohurt.blogspot.com/2017/01/quick-and-quiet-supersonic-flight.html