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Weather conditions not conducive to contrails. Dry air.
All planes produce contrails, they only last for a few seconds. Cold air passing through a warm engine produces moisture that freezes instantly. The low water content at 35,000 feet causes the ice crystals to change to a gas after a few seconds, it is called sublimation.
Completely wrong. Contrails will persist for many minutes if the air conditions are suitable. There is no sublimation if the relative humidity is high enough. There is video footage from World War II showing contrails from bomber formations that stream behind them for miles. If the air is dry, contrails do not persist. But I have seen them extend from horizon to horizon (we have humid air).
(Your understanding of the cause is ill-informed. The engine burns a hydrocarbon fuel and produces water vapor in the exhaust. Nothing to do with "cold air passing through a warm engine.")
Chemtrails last a LOT longer than mere minutes....
Correction: contrails last a lot longer than mere minutes when they persist from horizon to horizon, as I have seen. You have invented a mythical creature and refuse to accept what nature has provided.
LOL, Planes fly at 35,000 feet, at that altitude the temp is aprox -60 Fahrenheit. It is always dry at that altitude, don't be stupid as usual. The air cannot hold any moisture at 35,000 feet.
In the graph below it shows you that temps below -30 holds zero water content.
https://www.engineeringtoolbox.com/maximum-moisture-content-air-d_1403.html
I don't want to be "that guy", but that site isn't measuring at the low pressure of high altitude. It's measuring at sea level pressure.
All you are showing is that the saturation humidity becomes low, not zero. Here is some real data (9 km = 30,000 feet). http://www.climate4you.com/images/NOAA%20ESRL%20AtmospericRelativeHumidity%20GlobalMonthlyTempSince1948%20With37monthRunningAverage.gif Back off and learn. I am an aeronautical engineer and I happen to know my material.
Do you realize that the tropopause lies at 9 to 17 km altitude? That is the altitude to which the highest clouds can ascend. Clouds consist of non-gaseous water. They persist. Don't be so stupid as to deny what happens in nature. If the vapor pressure of the ice is lower than the partial pressure of the ambient water vapor, the ice will not sublime.