That does not explain why here in New England we almost never see “chemtrails” any time of year—and on the rare occasion we do see them they form Xs in the sky and do not dissipate for several hours.
There is no X flight pattern at high altitude here in southern New England for jets. There is nowhere for them to land unless they like big splashes in the Atlantic Ocean.
You could be the hero to the “chemtrail” community and track the flight in your area emitting the “chemtrail” via ADS-B (https://www.flightradar24.com/41.99,-72.55/7) then head to the airport and get photos of the said aircraft reloading the tanks (in the passenger area of a airliner? In the belly of the airliner (no luggage/cargo?).
Should look something like this: https://www.alamy.com/stock-photo/loading-c-130-tanker-with-fire-retardant.html
Or this:
https://youtu.be/0Ky5QoGh8WQ?si=AiRY3cezsvegzVDr
In the meantime further info.:
https://engineerine.com/contrails-vs-chemtrails/
https://www.epa.gov/sites/default/files/2016-10/documents/afd-051013-001.pdf
https://airplaneacademy.com/why-do-some-airplanes-leave-contrails-and-others-dont/
Knowing current “flight level”/upper air temperature/humidity data at the time of your “chemtrail” (contrail) sightings will help in your quest (know the altitude the “offending” aircraft is currently flying at when checking temps/humidity):
https://aviationweather.gov/gfa/#temps
https://aviationweather.gov/gfa/#obs