In article .com,
wrote:

Thank you all who replied to my post, of course i have spent time
looking at many sites claiming to know about chemtrails and some of
your posts were really quite believable but the question i put to you
now is, given that the laws of physics are set ,why have C.T's only
been seen in the last few years ( since the mid nineties) surley they
should have been seen for as long as we have had jets in the sky- what
has changed ??

Contrails have been with us ever since airplanes have regularly attained
high-altitude flight. WW-II films show them behind B-17 formations and
from patrolling fighters.

On a humid day, I can pull contrails off my propeller tips on the ground.

The "chemtrail" hoax is simply the product of the overactive imagination
of ignorant conspiracy kooks.