It's obvious that the chemtrail is at a MUCH lower altitude than the contrail formed by the high altitude aircraft. I'd approximate the chemtrail to be between 7000 and 12,000 feet, whereas the aircraft leaving the contrail would be at around 35,000 feet.
Being that there is no way in hell the temperature between 7000 to 12,000 feet would be anywhere close to the -35 C to -45 C temperature range, I'd say it'd be impossible for that chemtrail to actually be a contrail.
You're guessing. What some here are saying is that you cannot guess and hope to come to a correct conclusion. You have no way of knowing the altitude of anything, or of any conditions out there.
We don't have to prove they don't exist. You have to prove that they do. Pics or vids without specific information are not proof.