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"You're too cheap to fly faster"

https://medium.com/lift-and-drag/7885a299bca2

Top ground speed transportation has roughly doubled since the 60's. If Elon Musks hyperloop gets built, then you could see that become 3-4 times faster.

http://en.wikipedia.org/wiki/Land_speed_record_for_rail_vehi...

And there is of course the scramjet http://en.wikipedia.org/wiki/Scramjet which set records in 2003 which is 10,000kph faster than the record set in 61.

Right, so: like he said.

Blue-sky concepts which even the inventor himself doesn't want a piece of aside, I don't think the scramjet qualifies as air transportation, unless transporting an unmanned aircraft counts.

I can't tell, are you agreeing or disagreeing? There were lots of predictions from the 60s that transportation speeds would continue to increase, so this would be a good example of how hard it is to predict technological advances.