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
Lol—I just explained I live halfway between New York or Boston—both big cities with ridiculous traffic one hundred miles away from me.
I have not visited their airports in many years—and would never do so—probably a three hour drive to one in traffic.
Our closest airport in CT is about twenty five miles from my house—those planes are flying low and do not have contrails or chemtrails as they pass my house.