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The white line you see in the sky behind an airplane is water- water vapor. Known as a contrail (for conensation trail), this is visible when the very large amount of water vapor created by burning jet fuel meets the VERY cold air at high altitudes. Just as you can see your breath on a cold day, you can see the "breath" of the airplane engine. Jet aircraft may fly at 30,000 to 40,000 feet of altitude- where the air is -70 degrees F.

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Q: What is the white smoke that airplanes leave behind?
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