When passenger jet travel became possible with the invention of the De Havilland Comet in 1949 it created a revolution in travel by air all over the world. So, people could get anywhere (to major airports) twice as fast as before. Not only that when you are able to travel at higher altitude and faster this also tends to cushion both passengers and pilots from more jarring air changes that you can experience more at lower altitudes especially below 10,000 feet in altitude. Why is this? Because air is thicker at lower altitudes so it affects up and downdrafts and their affects upon a plane more at lower altitudes. So, even when present day jetliners go below 10,000 feet they usually slow down a lot for the comfort of their passengers and don't attain full cruising speed until they attain 30,000 to 40,000 feet in altitude. Also, traveling at a higher altitude gives added safety for planes and passengers because if anything goes wrong the pilots have almost 30,000 or 40,000 feet to make changes to save the passengers and plane from death.
So, this also gives and added measure of safety to passengers.
However, to travel at 30,000 to 40,000 feet you must pressurize and heat the cabins in the plane in order to keep passengers breathing and often planes at that altitude also add oxygen from tanks to the normal cabin air so people feel okay. However, it is generally practiced that flying you are about (air wise) what you are breathing at around 7000 feet in altitude sort of like climbing a mountain at 7000 feet. So, jogging isn't something you would want to do at that altitude because the air is thinner in the plane but since you are flying jogging wouldn't be practical anyway because there is no room to do this.
First commercial airliner tested in 1949 in England.
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