NASA's New X-Plane Program to Bring Quiet Supersonic Flight

NASA has plans to develop new supersonic passenger aircraft that are not only quieter, but also greener and less expensive to operate. If NASA's 2017 budget is approved, the agency will re-start their X-Plane program, the same program which was responsible for the first supersonic flight almost 70 years ago. And if all goes according to plan, the first test-model could be flying as soon as 2020. The problem with supersonic flight--and the reason it's banned-- is the uber-loud boom that it create...