Or, as a commenter said - an insect? Nonetheless, `cleans' up nicely on enhancement. Under 600 views.
Description with video:
was taping a normal vapor trail from a plane while sitting at a stop light so I could compare it to the chem trail vids I shot earlier that day. I didn't notice the fast dark spot until I uploaded it and watched it in slow motion. Only two frames but they are pertinent!
By the way, the round spot on the upper right is a speck on my camera lens (stays in the same place).
YT link - http://www.youtube.com/watch?v=MSQYzM1eoxE
Let these capture part of that Carolina Blue Sky Energy:
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