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We had a bunch of paniced folks in the Houston/Galveston area a few weeks back when there were contrails in a racetrack patterns overhead in various areas.

The story was that NASA was collecting air samples and weather data with their WB-57.

Some filks get upset over the smallest of things... Personally, I'd be upset if I saw a single contrail approaching then suddenly reversing course.

I witnessed this once, before they shut down the Austin air base, I saw several contrails approaching Houston from the west, then breaking off to the east. Seems we'd been attacked, (simulated, of course), by the Austin group.