Steven P. McNicoll wrote:
A Lieberma wrote:
Plenty of busy UNcontrolled and D class airports underlay the shelfs of B
and C....


Can you name some of them?


I can spot a few on the top 50 towers list put out by the FAA.
All are class D outside, but under the floor of class C/B airspace.

VNY is the busiest GA airport in the country. It's far busier by
any measure than BUR whose class C it underlies.

APA is the 25th busiest airport in the country and is under DEN's
shelf.

DVT is the 27th (under PHX).

LGB at #30 is under LAX.