Amazon published a proposal in the last couple days to segregate the altitude block close to the surface. Recreational drones (I presume including model aircraft) surface to 200' AGL, commercial drones in the corridor 200' AGL to 400' AGL. Non commercial would be able to fly in this block as well provided they have automatic collision avoidance devices, auto navigation devices to stay clear of hazards, and other mandatory equipment. Nothing in the block 400-500' AGL. Manned aircraft only above that. I'm paraphrasing of course. You can read for yourself.
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