Stamping and Embossing

Clear Block

It IS just water vapor. When the atmosphere the jet is flying through is cold and dry, the jet may leave a very short contrail, or none at all. If the atmosphere the jet is flying through is cold and moist, then the contrail will last for a while. And if it's cold and supersaturated, then the contrail may persist for hours, and spread across the sky by high winds. Persistent contrails usually mean that a weather front is on it's way. This means that those thin, whispy and nearly transparent cirrus clouds are visible, too.

"I have seen other plains at the same altitude with no vapor."

How can you possibly tell the EXACT altitude a jet is flying at with just your eyes? Chances are the jets you see are thousands of feet above one another, though from down here, they look like they are at the same altitude. Atmospheric conditions can change rapidly with altitude. The jet with a long contrail is flying through supersaturated, very moist air, and the jet with little or no contrail is flying through dry air. Sometimes, a jet may fly through patches of very different air masses, causing the jet to appear to be creating highway-like stripes in the sky, instead of a single contrail.

However, I do agree that it's not good. I don't like seeing the sun being blocked by man-made clouds.

And, please do some research on how clouds form. I guess clouds cannot be just water vapor. They must be some sort of stuff made only from artifical man-made junk. So I guess clouds cannot last for more than a few seconds. OMG!

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