It's a video from 2 or 3 years ago that shows 3 jets , the one in the middle is at a higher altitude than the 2 either side so is not producing a
contrail.
You can see the contrail from the middle jet ends at .09 on the video showing it was producing a contrail before it changed altitude.
edit on 25-2-2015 by gortex because: (no reason given)