Yesterday I observed during the overhead aircraft "persistant contrailing" that one of the larger aircraft that usually drops the BIG trails (looks like 4 engine contrails) had TWO different distinguishable behaviors between trails on each side of the aircraft. one set of trails on one side had what i would consider to be a common persistent "chemtrail", but the other set of trails was of the type of trails that looks like thinner vapor trails and attracts together at points along the trail to eventually make circles and ovals. I have observed each of these chemtrail types with different aircraft, but i have never observed 2 different types coming from the same aircraft. I observed this for the first time on April 8, 2011 and did not have a camera, so i made sure that i had one on hand when i observed it on April 13, 2011 at 2pm EST over Flint, MI. included are the original photo and 2 contrast / resolution enhanced versions. Thankyou Spread the word!! -Roy Peterson