Projects for both large-scale and business jet (see lower) passenger supersonic and hypersonic airliners (Aerion SBJ, HyperMach SonicStar, Next Generation Supersonic Transport, Tupolev Tu-444, Gulfstream X-54, LAPCAT, Reaction Engines A2, Zero Emission Hyper Sonic Transport, SpaceLiner, etc.) were proposed and now are under development.
In the 21st century some supersonic airliners and business jets (Aerion SBJ, HyperMach SonicStar, Next Generation Supersonic Transport, Tupolev Tu-444, Gulfstream X-54, LAPCAT, Reaction Engines A2, Zero Emission Hyper Sonic Transport) were under development.
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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.
In May 2008, it was reported that Aerion Corporation had $3 billion of pre-order sales on its Aerion SBJ supersonic business jet.