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If the air has low relative humidity, then a contrail will not form because the extra water vapor produced by the jet engines is not large enough to produce condensation. But if the is air has high relative humidity, then a contrail forms, using up the excess water vapor that the air can not hold.
If the air has so much water vapor in it already that it can’t hold any more (i.e. it’s “supersaturated”), then the ice crystals can’t sublimate, and so the contrail will stay around for a long time. The ice crystals might even attract water from the air, if there is enough, and the contrail will get thicker. Winds might make the contrail spread out to even cover the whole sky.
Originally posted by FutureThinker
Here is a good place to start your research on "Chemtrails".
Also, if you Google "Chemtrails", you will find a lot of info.
I don't know if what you saw was a Chemtrail or Contrail, there is a distinct difference, but they are both very real.
I hope that helps.