Ron Natalie wrote:

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.


What would you do as you approached them while on flight following,
assuming you do not yet have the field in sight and the controller
instructed you to report the field?