From a plane cruising at high altitudes, contrails behind other planes may sometimes appear dark while the planes themselves being sunlit.
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from http://www.nasa.gov/topics/aeronautics/features/access_fuel.html
Can you post a screenshot from your video, please?Hello. I was flying over the Alps yesterday in a Boeing 767 and saw a black line on the sky which I couldn't identify. I have a video of it. Could someone advise me if it is a contrail?