It is working to build a supersonic business jet, the Quiet Supersonic Transport (QSST), though there has been no news of the project since the company's website went dormant in 2010.
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Supersonic Aerospace International's Quiet Supersonic Transport is a 12 passenger design from Lockheed Martin that is to cruise at Mach 1.6, and is to create a sonic boom only 1% as strong as that generated by Concorde.