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I wouldn't have believed it either if I hadn't been watching the same stuff for the last two days. Perfectly empty blue skies then dozens of plane trails that spread out causing a white, high up, allover haze. Then the haze gets a texture and "clots" together to make the clouds as seen in photo. Quite stunning to watch. I don't believe all that moisture comes out the back of a plane but the trails do appear to gather all the unseen moisture together.
Originally posted by forsakenwayfarer
I simply do not believe that cloud came from a plane.