And even earlier: http://en.wikipedia.org/wiki/Supersonic_transport http://en.wikipedia.org/wiki/Supersonic_transport I suspect this is one of those Big Challe

And even earlier: http://en.wikipedia.org/wiki/Supersonic_transport http://en.wikipedia.org/wiki/Supersonic_transport I suspect this is one of those Big Challenges that keeps tempting aeronautical engineers, and they try to apply the pushing-the-envelope high tech of their era to it. The problem seems to be the economics. There aren't a lot of people who are willing to pay 10x prices (or whatever) for 3x reductions in travel time.