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They can fly over the majority of clouds, but not all clouds. Depending on the latitude, a commercial airliner cruises at an altitude such that it is on the cusp of the troposphere and stratosphere, which is the most economical place to fly. In temperate latitudes this is around 30-40,000 feet. While this is well above the low to mid-level clouds that exist below 20,000 feet, it is nowhere near the high-level clouds which can exist well beyond the stratosphere, in the mesosphere, which typically begins at around 160,000 feet. These clouds are thin and whispy, consisting mostly of ice crystals due to the extremely low temperature.

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12y ago

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