Robert M. Gary wrote:

Gee, we can take most of the cost out and we
won't even feel it!!

And you haven't even considered maintenance. By the time one of those 8' thick
runways needs resurfacing, we'll probably have anti-gravity systems and won't
need 'em. Hey, some of the old WW II bases are still in good shape after serving
all this time as GA fields.

George Patterson
Give a person a fish and you feed him for a day; teach a person to
use the Internet and he won't bother you for weeks.