Silly, the pilot opens the front door and has a bag of chemicals that he slowly tosses out into the engines. If you have a good pair of binoculars you can watch them do it. Sometimes it is out an open cockpit window. You can identify the planes becuse they have the code word Continental (for Chemtrail) written on them. Where's AMT4SWA? He knows all about this stuffQuote from Lucrum:
What types of aircraft are dispersing these "chemtrails" and what sort of dispensing mechanism are they using?

The ones you claimed only last seconds?Quote from FightTheFuture:
...modern contrails ruin my photos.
Quote from FightTheFuture:
Contrails of water vapor last only seconds.
Interesting, there are more jets in the sky now than before of course.1960's, 70's, 80's, 90's I had no interference.
There has been no major reformulation that I'm aware of, nor have I noticed a green tint to current contrails. What part of the world are you in?Whether the jet fuel is reformulated to make it greenish or they are experimenting to fight bogus warming, all I'm saying is it's a waste of taxpayer money. I don't believe in those conspiracy theories.
Quote from Lucrum:
Not true, depending on conditions they can last for many minutes.