You mean a condensation trail made by the exhaust of an aircraft engine?
No. I mean 8 -10 streaks for 20 miles across the sky that all happen to fly over within 5 minutes of each other within an hour. Block the sun, make the sky hazzy as hell, you can see them spread across as they sink. It's not water... then next week, you get the same temp, a plane flies over with about 1.5 - 2 miles of steak, no long trail, dissipates clearly, with no trace, with a perfectly sunny sky all day. Just doesn't make sense. I've even seen one jet make streaks across the sky, with another jet that flew by shortly after having a 1-2 miles real contrail. Doesn't make sense..