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1) Above "18,000' msl" airspace.
2)"IN","UNDER", "ABOVE" and the "VEIL"
of CLASS B airspace,
3) In CLASS C airspace.
You are just fine without the manditory "ADS-B IN/OUT." You can even fly into CLASS D (control tower) airspace, and stay below 10,000' msl, and you can fly all you want without a, "Stinkin ADS-B IN/OUT." Us "little guys" can sleep easy, but you "big guys," it's finger nails biting, pacing the floor time.