Scientists and aviation experts say those are contrails: clouds of water vapors that are emitted from a plane’s jet engine. Others believe in a much more sinister theory. More: wltx.com/article/news/verify/social-media/those-long-thin-clouds-you-see-behind-planes-are-contrails-not-chemtrails/536-2dc0433f-b0ce-4577-803a-c94c1525b47a

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