For those interested in supersonic travel.
The SST isn't dead, but could be some time off. LM and NASA are working on it at least. It's all about the boom.
http://www.lockheedmartin.com/us/innovations/072016-webt-supersonic-flight-hush-sonic-boom.html
http://www.lockheedmartin.com/us/innovations/072016-webt-supersonic-flight-hush-sonic-boom.html