I know that supersonic airliners have never been widespread, by reason of cost, engine technology, aerodynamics. Yet can these difficulties be overcome within the next 20 years?

I know of Concorde's retirement and ongoing attempts at Supersonic Business Jets.

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    $\begingroup$ This looks like a dupe of this question, but I can't mark it as such because it has no answers; it was closed as a dupe of other questions, including this one. $\endgroup$
    – Pondlife
    Aug 9, 2018 at 16:03
  • $\begingroup$ @Dave Please go ahead and edit my question with your notes! $\endgroup$
    – user128
    Aug 9, 2018 at 16:31
  • $\begingroup$ @Pondlife if anyone feels strongly about it, we mods can close it as dupe of questions that are dupes themselves. Ping me in chat if you wish $\endgroup$
    – Federico
    Aug 9, 2018 at 16:55
  • $\begingroup$ @Federico Thanks for the info, that's good to know! I don't feel that strongly about it myself, so unless there's a clear consensus I'm not in a hurry to close it. $\endgroup$
    – Pondlife
    Aug 9, 2018 at 17:49
  • $\begingroup$ @Greek-Area51Proposal if it does not end up closed in the next 24 hours i may add an answer but im going to refrain from editing the question as it is a dupe as it stands but is clear on what you are asking. $\endgroup$
    – Dave
    Aug 9, 2018 at 19:05