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Re:Boom (YC W16) – Supersonic Passenger Airplanes by mikedouglas on Monday March 21, 2016 @10:35PM (#11334047)
From the link: "In the late 1990s I paid $11,000US each for several round trips."

That's about $16k when accounting for inflation, so $20k isn't too far off.

Re:Boom (YC W16) – Supersonic Passenger Airplanes by aninhumer on Tuesday March 22, 2016 @01:13PM (#11338069)
Without qualification, I'd assume they were quoting historical prices. It would be pretty confusing to present any kind of adjusted figures without clarifying them.