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originally posted by: stormcell
It might be air temperature differences. The pilot might even be starting and stopping the fuel to the engines.
You would really need to do laser chromatography to prove that there were chemicals in the contrails.
originally posted by: GBP/JPY
hail i have a video of them inside the aircraft doing it ...military btw....showing up close a remote seat with the switches marked video of two turbines and the outlet......so they could view the action from that small console...had its own jump seat though