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Contrails. I see them all the time, although not usually in that quantity. If you live in a heavily-trafficked area, that quantity wouldn't be unusual.
They get spread by high altitude winds, that's probably why you tend to see them when the jet stream is over you. The higher the relative humidity at this level, the longer they stay around. When high altitude air is dry, they disappear shortly after the plane has passed. When it's humid, they hang around and form an ugly mess of altitude clouds.
the smoke that causes these do not come out of all planes.
I have seen 3 planes in a line flying at the same time with the same smoke that was lingering for hours but I never see this coming out of commercial planes.
Why does it occur with certain planes but not others?
Dude, relax. It's just harmless water vapor. It happens when the hot exhaust from jet engines condenses as it hits the cold humid air aloft.
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