If you live in a place where many air routes pass and/or cross, over time you'll see some really strange effects depending on the temperature and the wind drift.

My explanation of "wind drift" as against "wind" is when the air is relatively still with little apparent wind but the air imperceptibly "drifts".

With con trails, sometimes an aircraft leaves a trail which doesn't last very long at all, you can see the aircraft leaving the trail but the trail's gone after half a minute. Another time, you can see an aircraft approaching at distance, see the trail it's left, watch it approach, pass over and fade in to the distance and the trail will still be there.

With "wind", the trail will be dispersed, with "wind drift", the trail will be displaced but the trail be virtually intact.

At 450 - 500 MPH a change of direction as shown in the pic over that relatively short distance to resume not far off a straight line would be a little difficult to say the least.