Contrails
grab the zip here (installation istructions included, 53k): contrails.zip

for plain white contrails, this is the file you want (installation istructions included, 8k): white_contrails.zip

This was just a little exercise to verify the possibilities of the very flexible particle system of CFS2.
Nevertheless it can be useful to understand the maneuvers pulled by the AI during dogfights, as an ACM (Air Combat Maneuvers) learning tool, of for plain aerobatic fun.
It also helps with lead shooting, as you can see below ;-)