Comment: Funny

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Funny

No there are ones that leave a trail,and it stays,they do not dissipate
these spread out,and cause the sky to turn gray,when i first noticed them
3 days later it would rain,bet this give meteorologists a run for their money

It's a well-known phenomenon that the atmospheric conditions (high relative humidity at altitude) that enable contrail persistence correlate with rain/haze/overcast conditions at ground level shortly thereafter. This is for the same reason that people noticed, long long before airplanes, that certain kinds of clouds often foretold rain moving in.

Contrails have been, under the right atmospheric conditions, spreading out and turning the sky gray for just as long as airplanes have been burning fossil fuels at high altitudes. I posted a 1980 video about it, but that's not when it began. Meteorologists have known about and understood this phenomenon since before you took your first science class.