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What is the difference between a persistent and a spreading contrail ?
A spreading contrail is actually a type of persistent contrail. A contrail is the trail left behind from a plane’s exhaust that looks like a cloud. Persistent contrails last longer than the plane is in sight. They look like long white lines in the sky. Spreading contrails are persistent contrails that spread out and look more like natural clouds. For more information, check out NASA’s website about contrails.