"It is well established by atmospheric scientists that contrails can not only persist for hours, but it is a perfectly normal characteristic for them to spread out into cirrus sheets. The different sized ice crystals in contrails descend at different rates, which spreads the contrail vertically. Then the differential in wind speeds between altitudes (wind shear) results in the spreading of the contrail across many miles in the sky."
Haha, gracie...we were both reading that article. I brought the above quote from it and there you are with the citation....
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