http://www.saiqsst.com
The QSST, under development by Gulfstream.
The "Q" denotes "Quiet". At ground level, the report is less than a truck going by.
(From the website):
QSST AT A GLANCE
The Quiet Supersonic Transport (QSST) will redefine air travel in the 21st Century. With a non-stop range of more than 4,000 nautical miles, QSST will be able to fly at uninterrupted supersonic speeds over land and sea. Up to twelve passengers will be able to travel in large cabin comfort to global destinations in half the time taken by current passenger aircraft. QSST is the only jet with a patented design to revolutionize travel with a low "shaped sonic signature" over 100 times quieter than the recently retired "Concorde" supersonic aircraft.
