It's still a long way off, but we are working on building quieter supersonic planes [1]. I think we will almost certainly see the return of international supers

It's still a long way off, but we are working on building quieter supersonic planes [1]. I think we will almost certainly see the return of international supersonics first, but never is a very long time. [1]: http://www.nasa.gov/press-release/nasa-begins-work-to-build-a-quieter-supersonic-passenger-jet http://www.nasa.gov/press-release/nasa-begins-work-to-build-...