My brother mentioned this same thing to me, and it immediately made me think that it might be happening more during the night. A few weeks ago, I was outside doing my last-cigarette-of-the-night lonesome thinker routine, and a plane flew over with a really dense contrail. The moonlight made it ultra visible. What made me uneasy was that streamers started falling out of the trail, discrete streamers just precipitating down like fingers.
Maybe it's just a physics thing, the lower air temperature absent any sunlight caused the jet trail to condense and fall out to a lower elevation. Fuck, I don't know. I just know that the visual was creepy as fuck, and it made me think, "Hmm, maybe they just do this at night now so more people are asleep and won't notice persistent contrails".
If they kept the spraying to the night hours for any given region, not only would the trails disperse while most were asleep (not to be seen in the a.m.), it is more difficult to distinguish any of the characteristics of contrails when there isn't any light.
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