Corrected entry: When Telly and Ash arrive to the hangars, we see a plane taking off which leaves a tiny line of vapour. It is impossible due to the air temperature near the earth, to condense the air.
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Correction: Condensation has little to do with temperature, it is more a function of humidity. Warmer air will condense as it cools. Picture a bathroom mirror after a shower. As the air cools (hot exhaust from the engine) it condenses out its moisture as it cools (hitting the atmosphere). It's why car exhaust can sometimes be seen even when it's not freezing out, and conversely, may not be seen if it is cold, but dry out. Besides which, the plane taking off had nothing at all to do with the movie, other than it was taking off during filming. If you saw contrails, it wasn't added to the shot, and occured naturally.