Replying to myself. But look at photos from the 60's, 70's and 80's.. You won't see STREAKS in the skies like we do today. You can talk about contrails and moisture as much as you want. I never use to be like this... we have noticed.
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I can't comment on whether or not that's true but I do know that air traffic has increased quite a bit over that time. http://www.1001crash.com/index-page-statistique-lg-2.html
Yes it has.. and normal condensation from a jet will last 20 - 30 minutes after it passes based on atomspheric pressure and other factors. Its the lines in the sky that sit there all day for hours and hours that people are complaining about.. that's not water vapor, it would have dissipated by that time.