ScienceDaily (June 30, 2011) — As airplanes fly through the clouds, they often punch holes through the ones that contain supercooled water, or water that has remained in liquid form below its freezing point. Now, researchers say that this phenomenon can lead to increased snowfall around the world's major airports.
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Such porous cloud covers, induced by aircraft, have been documented for decades -- and they are sometimes mistaken for rocket launches or U.F.Os, like the ominous saucer-looking cloud that hovered over Moscow in 2009, prompting all sorts of speculation and conspiracy theories.
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[I wonder if this would cause a noticeable decrease in precipitation away from the airports? My guess would be no, that the amount of air around airports is too small a proportion of the total amount of air on earth, but I don't know.]
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