Vapor trails better known as Comtrails left by hundreds aircraft passing over head each day. More noticeable when there more moisture in the air at the level they are flying. Use to watch them on my lunch break 10 to 20 would pass on certain days going ever direction. Would leave the sky streaked till disappeared.
Ever been to healthrow you can see vapor spinning off the wing tips at landing on certain days do to the moisture in the air at low altitude.
This was big problem in WW2. Bombers could easily be spotted in they were at the right altitude.
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