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.
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.
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