Originally Posted by the_traveler
I was in a "near miss" a few years ago, on a flight from IAH-SLC. Our plane actually made a turn to the left, due to another aircraft crossing our path. After a minute or so, we banked right to continue to SLC.
But after this bank, we
CROSSED THE CONTRAIL of the other plane,
NOT 1000 feet above or below - but
AT THE SAME LEVEL and horizontally only a few miles (or less!) apart!

(I could see the exhaust through the windows on both the left and right sides of the aircraft!)
That's too close for me!
You don't know if you switched altitude. 1000 feet is not going to be noticable.
By the time you passed the flight path of the other plane, you would have been miles apart, and being at the same altitude and going
the other direction is the easiest way to avoid a mid-air collision, right?
Don't worry about it!