Saryon wrote:

Even in D, E, and G? 91.215 only references class A, B, and C airspace
and I was under the impression (instructor and the Cessna Cleared for
Takeoff book) that unless you were within those areas (or within the
veil outside of the B) that transponder use was optional.

You're right. I misread the FAR.

George Patterson
Battle, n; A method of untying with the teeth a political knot that would
not yield to the tongue.