Supersonic Aerospace International (SAI) has commissioned aerospace contractor Lockheed Martin to design a supersonic airplane: the Quiet Supersonic Transport (QSST), a 12-seat supersonic civilian jet that could come to fruition by 2013. The QSST will travel 1.6 times the speed of sound (Mach 1.6), or 1,200 miles per hour. A patented design is expected to produce a sonic signature 1/100 that of the Concorde. [thanks, Paul Marks]