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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.
Keep telling yourself that chemtrails don't exist.