It's also weird to explain...so I have provided a drawing.
In my little drawing, A and B are cities. The line X is a line approximating the distance if you were to drive from A to B.
Line Y is approximating the distance if you were to fly from A to B at some sorta altitude. And finally line Z is approximating the distance of flying from A to B at some sorta altitude which is much higher than that at which line Y is.
With this in mind, I've come to the conclusion that there is a longer distance involved the higher the altitude. My question is, how significant is this longer distance? In particular, in airline terms, is the distance all that much longer between a plane flying between A and B at 35,000 feet and a plane flying at 45,000 feet? How much more distance does the Concorde have to fly since it's flying at least 25,000 feet higher than anything else?
Warm regards in advance for your answers.