thanks for your link. it led me to this: https://www.metabunk.org/debunking-contrails-dont-persist-with-a-study-of-70-years-of-books-on-clouds.t3201/
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thanks for your link. it led me to this: https://www.metabunk.org/debunking-contrails-dont-persist-with-a-study-of-70-years-of-books-on-clouds.t3201/