Because as the Concorde demonstrated (and this was hardly news by the time it was even designed), the cost of fuel rises exponentially the faster you go through the atmosphere.
Also worth noting, is that because we have an atmosphere and a speed of sound, going faster than that speed is very loud, and tends to break windows when you go past it. This made a lot of farmers who have glass greenhouses, very, very upset.
Thus, the only place you can actually go that fast, is over uninhabited parts of the world. It’s literally only possible between Ireland and New York.
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