A flash of light streaked across the daytime sky at about the altitude of a jet, but at least 10 times faster.In my peripheral vision I saw a a light streak across a short distance of the sky--if it had been just a few feet away, I would have perceived its speed as over 100 mph. Considering it seemed more like a few thousand feet away, it must have been going at least 1000 mph.If I had witnessed this at night, I would have assumed it was a "shooting star," but the sun had been up for an hour. It was foggy, but I could still see the blue sky clearly. It left a short contrail that faded at both ends. The incident and contrail seemed to close to earth to have been a meteor, even if it were possible to see it during the daylight.