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contrails generally disappear in about 30 seconds. Chemtrails seem to expand and become cloud like.
But what the hell do I know. It just doesn't look right to see checkerboard patterns in the air.
Here is a picture that I took, can't really tell with the low res but you can really see it on the high res version. Checkerboard pattern of clouds dispersing into a thin cloud-like layer. Picture taken on September 15th 2005 at Calaway Park outside of Calgary, Alberta.
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