Vertical Separation.
Can anyone help, please? I'm not in the "Biz", just a dedicated enthusiast.
This afternoon, I was watching two airliners, in a beautiful clear blue sky, flying over me, and directly away from me.
At first, it seamt that they were flying parallel to each other, and they were abreast of each other.
In fact, their paths converged, until one passed directly over the other one. I know that they were not really close to each other, and the angle I was then viewing them at exaggerated the fact.
What I would like to know is, what would their vertical separation have been? (Quadrantal rule?)
Thanks. N.Z.