"Jet contrails" refers to the long white lines that airplanes sometimes leave behind in the sky. These lines are formed when hot exhaust gases from a jet engine mix with colder air, causing condensation and creating visible trails. Full definition
The nature and persistence of jet contrails can be used to predict the weather. (scientificamerican.com)
«There were people saying, «Why aren't you doing more with jet contrails?» (sciencenews.org)
The strongly bent lateral tails offer the astronomers clues to the geometry of the pulsar, which could be compared to either jet contrails soaring into space, or to a bow shock similar to the shockwave created by a bullet as it is shot through the air. (sciencedaily.com)