Just wanted to be an asshole and point out that the Concorde could actually take off and land from anywhere, but it's not to get over Mach 1 while over land. Because of the sonic boom, of course.
It just means that the Concorde is only useful for flying over big stretches of water. Flying one across the US would be silly because it can't go much faster than a normal jet (say, 767, which flies at about .79 Mach if I remember correctly). So that's why it's only used when making overseas trips.
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