There is no evidence whatsoever of aircraft modified to perform some of the spraying methodologies that are proposed. The only things on an aircraft that shoot things out (besides the engine exhaust) is the toilet and the fuel dump orifices, often at the wing tip. If the aircraft are squirting chemicals out of the fuel dump nozzles, what's in the fuel tanks? Poisonous chemicals?
(One exception to this is a military version of a civilian aircraft called TACAMO, a Navy variant of the AWACS aircraft. It has these oddball nozzles near the base of the wings. But they're still fuel-dump nozzles; they've merely been moved inboard because the TACAMO has reconnaissance pods at the wingtips, and they don't want to jettison JP-8 over the million-dollar electronics.)
If they were using the human waste dump orifices then they would beed to install devices to aerosolize the chemicals and tell the pilots where to release. If it were a passenger airplane it could not spray in a checkerboard pattern because they are on a timetable to get from point a to point b.
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Thanks Hueyii for your insight...this confirms to me that the airplanes being used are Drones...
Enlighten yourself with the Videos below...make sure you don't tell Boeing!
Posted below are extremely informative videos regarding Chemtrails:
http://www.youtube.com/watch?v=fSryORtHQZw
http://www.youtube.com/watch?v=wye2YWRohT4&NR=1
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The End is the Beginning and the Beginning is Now...
Yours Truly