JFDee
Senior Member.
Purportedly a smoking gun:
http://www.youtube.com/watch?v=_F5rjgz46Qw
I was not able to stand his rambling over the whole length, but as far as I could make out, his conclusion is that it is unlikely that a lower plane is producing a more persistent trail than a plane above it.
The trail that he is showing from 7:36 looks indeed interesting though. I think it's an aerodynamic contrail.
I also think the plane (probably descending) is lower than the 28000 ft. he took from the tracking software. (Probably isn't even QF 63.)
http://www.youtube.com/watch?v=_F5rjgz46Qw
I was not able to stand his rambling over the whole length, but as far as I could make out, his conclusion is that it is unlikely that a lower plane is producing a more persistent trail than a plane above it.
The trail that he is showing from 7:36 looks indeed interesting though. I think it's an aerodynamic contrail.
I also think the plane (probably descending) is lower than the 28000 ft. he took from the tracking software. (Probably isn't even QF 63.)