They're baaaaaack. Like clockwork.
(media.greatawakening.win)
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No, they're not. Otherwise they would always be seen.
According to the ICAO . . .
The International Standard Atmosphere at mean sea level is a temperature of +15ºC (59ºF) at a Pressure of 1013.2mb (29.92 InHg) decreasing by 1.98ºC (35.564ºF) per 1000 feet of increased altitude.
However, at the tropopause, the temperature remains constant at -56.5ºC (-69.7ºF). The height of the tropopause varies all the time but it is USUALLY around the 36,000 ft mark - depending on time of year and the latitude (higher near the equator than the poles).
I love it when I see one plane doing a contrail and another doing a chemtrail at roughly the same altitude. Also love it when they run out of aerosol and then turn around and go home and the trail stops dead.