Altitude has nothing to do with the trails jets are leaving. Here’s a jet flying at low altitude leaving an aerosol trail. These are not contrails.
![YouTube video](https://i.ytimg.com/vi/CM9dPKgI0rs/hqdefault.jpg)
Altitude has nothing to do with the trails jets are leaving. Here’s a jet flying at low altitude leaving an aerosol trail. These are not contrails.