Hi Spotterboy, just a hind, go to flightsim.com and try to find jettrail.zip and download it.
I did it a few weeks ago and it is an amazing new file who completely changes your jettrails from
the boring standard ones!!! They are much more realistic and stays longer in the sky and when
using real weather (I'm using FS
Meteo) than you can even see that they deviate in the wind
direction and deform when turbulences are present!!! You will also see other aircrafts jettrails in the
sky when flying, believe me it is amazing and unbelievable how a little file can change the realism
of flying in FS
Ps: if you get a problem finding the file than contact me via mail and I will then send it to you!