Circular runways for airports?

Larry Dighera wrote:
Now here's an idea almost as good as underground airports*:



http://www.newscientist.com/article/...-airports.html
A CIRCULAR runway ...

On 26 Dec 2006 11:53:03 -0800, "Robert M. Gary"
wrote in .com:

They correctly pointed out some (but not all) of the cons. Where is the
pro??


So you like the idea of underground airports, eh? :-)

The answer to your question seems to be contained in the first
paragraph:

One particular advantage is that it would save one-third of the
space occupied by a conventional airport of equal capacity.