Yeah, you know what, I don't believe any of that chemtrail BS. Seriously, I saw some of those episodes on Discovery and they had chemtrail 'experts' that said that the trails could last for days and could be miles long and rained microscopic poisonous chemicals on people blah blah blah...
The real reason for the contrails lasting as long as they do is nothing more than the right combination of temperature and humidity. I mean, I saw plenty of aircraft pulling long contrails across the sky with parts of the contrails that were broken, so they looked like dashes instead of lines. That was happening right behind the aircraft. Now is that due to varying temperature and humidity or are the pilots just repeatedly shutting off and turning on the engines? Anyone with common sense could answer that.
Chemtrails? ....Give me a break.