Dear Lynn!

Thank you for explaining why it is this way. But the arc regression is not the only problem, but most likely the most important one.

I think that the airspace file for teh WGC dserved a little bit more work. I think that radii should be manually entered from the official FAA orders, which are available for download, for the airspaces which are used for the WGC.

Two technical question. Do you do the arc regression on a sphere or on an ellipsoid? The inconsistencies of the open-air arcs would be easier understood when you do it on a sphere.


HLT
Hans L. Trautenberg