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Re:Boom (YC W16) – Supersonic Passenger Airplanes by MattBearman on Monday March 21, 2016 @12:55PM (#11329473)
Feel like their tagline should be "We're making supersonic flight a reality. Again" :P

Looks interesting though

Re:Boom (YC W16) – Supersonic Passenger Airplanes by bscholl on Monday March 21, 2016 @01:27PM (#11329860)
Good point. It's so sad that Concorde came and went without a replacement in place. (FYI, I'm a founder at Boom).