Im just being open to possibilities, Im not asking anyone to convince me...
Well then did you open the thread up with questions like: "anyone have any ideas?"
"anyone know anything about this?"
and of course, "Yeah, but vapor wouldnt sit there for hours with the sun shining on it on a totally clear day. Theres a BIG difference between vapor trails and these. You can see the jets flying, then they turn something on and you see the white trails, then they turn it off and fly away."
It certainly sounds to me like you are looking for answers. I personally am not trying to convince you, but am trying to answer your questions. I apologize for the STFU comment, but it just seems to me that you aren't acknowledging anyone's explanations and have been very closed minded to the ideas presented here.
An analogy (maybe not the best one but...) would be like if I came here to RIU as a noob and asked why I couldn't grow pot with my $30 halogen bulb lamp since it puts out a lot of lumens, and then you and others try to explain efficiency, PAR, color temps, etc. But I keep insisting my halogen has a yellow color, and bright so it should work, etc. I bet you would get a bit frustrated with me since I apparently am not really reading or acknowledging any of your responses but appear to have my mind made up.
So in come responses explaining how these are merely regular contrails.
Other posters and I have given you plenty of scientific and photographic evidence that normal contrails can exist for many hours or dissipate quickly depending on conditions, in much the same way that clouds hang around or break up, or snowflakes can either last long enough to accumulate on the ground or in other situations, vanish in seconds, even in freezing temperatures.
The answer to both of those is the same,
sublimation.
Sublimation is when a substance (in this case, water), goes directly from being solid to being vapor (a gas), without actually melting into a liquid. Its like evaporation, except instead of a liquid evaporating, its a solid (water ice). If the air is dry (i.e. there is little water vapor in it), then the ice crystals will quickly sublimate into vapor, and the trail will vanish quickly.
However, if the air already has a lot of water vapor in it, then the ice will sublimate slower, and the trail will last longer.
If the air has so much water vapor in it already that it cant hold any more (i.e. its supersaturated), then the ice crystals cant sublimate, and so the contrail will stay around for a long time. The ice crystals might even attract water from the air, if there is enough, and the contrail will get thicker. Winds might make the contrail spread out to even cover the whole sky.
The above is a simplification, as other factors like temperature, pressure, and sunlight have an effect. But it explains the basic reasons why some trails last only a few seconds, and some can last for hours, and spread out to cover the sky.
Yes, I know I have explained this before, but I'm not trying to 'prove you wrong' but merely answer the questions you started out with. It was only after you became defensive and began repeating the same questions that had already been answer, often in a snotty tone, that I responded in kind.
One last thing. There have been a few questions posed to you that you still have declined to answer. Those questions were asked to help understand your thought process and maybe help you break through the logical barrier that seems to be blocking you from understanding.
I am more than willing to take a step back and start over again from the beginning. All I ask is that you do the same and give me the same courtesy by providing actual evidence and scientific explanation that contradicts the information I and others have offered, rather than just your opinion that we're wrong.