Hey. So yes, trails form as a result of temperature and humidity conditions at high altitude. The ground temperature is completely irrelevant to the formation of ice crystals closer to the stratosphere. I spend a lot of time up there so feel free to ask me. I've seen it all to be honest. Sometimes airplanes leave big contrails, sometimes nothing at all. And up at 38,000/40,000 ft where airliners cruise it's always cold, from -20 to -70 °C roughly. The hot air coming out of thee engine transforms straight into ice crystals or not.
Discussion
Thanks for the explanation.
But, respectfully, I don't believe that to be the case.
It never used to happen and it will one day stop happening again.
Anyone over 40 claiming this was the norm when they were growing up has been completely programmed.
Absofukinlutely! I'm in my mid 50s and cannot remember ever seeing crisscross markings in the sky. We used to watch as the CON trails evaporated closely behind the jet.
Danny, me ol son, you're too polite!! 😀🇬🇧🚒😎
Interesting convo. Cloud seeding definitely occurs, but that involves smaller aircraft releasing condensate such as silver iodate into a developing cloud base. Boeings releasing thin streaks of condensate at high altitude for hundreds of miles, would be the most expensive, least effective way of modifying climate. Besides, where would a commercial aircraft like a Boeing store the hundreds of liters (and kg) of the required chemicals? Just makes no sense.
Also, bear in mind that there were fewer planes when we were growing up, and I'm not sure they flew at the same attitudes as now. When someone shows conclusive evidence of condensate chemicals and a release mechanism on a COMMERCIAL JET PLANE such as a Boeing, I'll gladly reassess my skepticism.