There's a common belief that all contrails must dissipate immediately. If they don't, they are labeled as being "chem trails" .
But If you look back at any book on clouds in the last 60+ years they will tell you that contrails sometimes fade away, sometimes persist, and sometimes spread out.
So if someone tells you that contrails can't persist, ask yourself what is more likely:
A) He is mistaken
B) All the books on clouds for the past 60+ years are mistaken.
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