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They are called con-trail or contrails, short for condensation trial, they occur when the warm moist from the jet engines enters in contact with the cold air.
Also, contrails can be generated on the wingtips, when the air flows over the wing, it travels further and therefore it speed up, causing the pressure drop, wich will cause any water vapor suspended in the air to condensate and form into a cloud.
Wiki User
∙ 14y ago
Wiki User
∙ 11y agoUsally its jets that leave the white trails in the sky, more often than not its only military jets that leave those trails
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