RK Henry writes:

I found a source on AOPA's site. I won't reproduce it here, but AOPA
members can search for it as article 352. It says that the pilot must
turn on the anti-collision lights whenever he "operates" [their
quotes] the aircraft, which means every time he starts the engine. I
consider that a fairly authoritative source, though not as
authoritative as the FAA, of course.

AOPA has no enforcement or regulatory authority at all.

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