Thanks Dennis
I'm actually not too surprised at that. It just goes to show how hard it would be to plan to reproduce this at another site.
I suspect the planes are on a relatively tight course by VOR or GPS and thus their course (for that Flight number) relatively reproducible. That coupled with Chris' observations over the year + phase of the moon allowed it, but heck I don't think we'll see too many other planned shots like it anytime soon!
Closer to the terminal area at destination the aircraft are probably more likely to get air traffic control course adjustments making this sort of thing very difficult near an airport, but also the aircraft would be too low and appear too fast.
Great maths too BTW Dennis
