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I was out in the country recently and saw some very high flying planes. Typical cruising altitude for a jumbo is 35,000 feet but can be as high as 50,000 feet! That's 10 - 15 kilometes. Most planes that you see near the cities (the ones you actually "see" flying in the sky, withing several hundred kilometers of an airport) are descending approaching landing or yet to reach cruising altitude and probably closer to 10,000 feet or less.
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