Contrails form in moist, cold air. The jet engines add to the moisture and it condensates into the contrail.
When the conditions are right, you get lots of them and they stick around a long time if the air "up there" (20k feet or more) isn't moving fast.
You aren't getting "sprayed" with "chemtrails".
No kidding. Like I said, I own no tin-foil hats. But it sounds like this guy on the radio just bought a whole bunch of stock in them.
I know what a contrail is and I also know what a chemtrail is.
About 8 or 9 years ago my neighbor and I were sitting out in my backyard having coffee. We were just taking life easy and talking about whatever came up. He asked me what I thought about chemtrails. I didn't know what they were.
As we talked we watched various sized jetliners on their East West flights. They are a common sight here in Reno, NV being right in line with SFO, OAK and SAC and SJC. As we watched this one big silver jet had a slightly wider contrail than the others. We watched it come towards us from the West, go overtop and fly East towards Fallon Naval Air Station for another five minutes.
Then as we both watched the contrail ceased and the plane banked to the left making a wide sweeping turn and headed West. As soon as it was leveled out the contrail started again.
This particular plane made four passes over the Washoe Valley spraying whatever it is that they spray in an East West pattern. Within three hours we had a 'cloud cover' over the entire valley.
Now was this something to do with weather control? I have no idea but I do know that American Airlines does not offer flights that circle Washoe Valley, nor does any other airline company.
So you folks who boast that you know there is no such thing as chemtrails continue on with your beliefs. I won't belittle you but I do know what Mike and I saw that morning. You may find it odd as I did. If you wish to see it for yourself all it is going to take is an open mind and some time watching the sky.