Ron Natalie wrote:
The class D is 4.6 NM (which you'll find is about the same
as 5 SM) and they made provision for class E extensions to
the class D (to handle the little notches of CZ that used
to protrude past the ATA boundaries).


As far as I can tell, there's no standard size for a class D circle. They
define the radius when the airspace is established. If you take a look at
a sectional of the airports around Phoenix, you'll see that most are 4NM, but
some are larger and some are smaller. Williams Gateway (IWA) is larger than
average, and on the west side, both Glendale (GEU) and Goodyear (GYR) are
much smaller than average.

John Galban=====N4BQ (PA28-180)

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