Wingtip vortices
From Wikimedia Commons, the free media repository
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F/A-18C showing wing tip vapor trails
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F/A-18F showing vapor cloud over its wings
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Wingtip vortices stream from an F-15 as it disengages from a KC-10 Extender following midair refueling.
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A NASA study on wingtip vortices produced these pictures of smoke in the wake of a crop duster.
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Wingtip vortices from a Cessna 182 wind tunnel model.