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It's not private, it's a national resource. Every time you fly any airliner you use this system. The reason the US airspace system is so expansive is that it's

It's not private, it's a national resource. Every time you fly any airliner you use this system. The reason the US airspace system is so expansive is that it's necessary to allow the level of freedom afforded to private aircraft (think Piper, not Gulfstream) while maintaining safety and coverage as top priorities. However, you're correct that most airspace below 400 feet AGL shouldn't be considered part of the system. Generally, that's not considered navigable unless it's being used takeoff and landing.

nybble41 8y ago
> It's not private, it's a national resource. If you're setting rules for how something can be used then you're treating it as your private property. Even if you happen to be the U.S. government. So-called "public property" is nothing more or less than property the government has claimed for its own exclusive (i.e. private) use. > Every time you fly any airliner you use this system. Obviously. That's the same as saying "planes fly in the air". But commercial flights follow defined routes between specific airports; they don't need to claim the entire atmosphere for that, just the relatively tiny corridors they routinely fly through. > Generally, [below 400' AGL is] not considered navigable unless it's being used takeoff and landing. And yet here we are, with the FAA imposing onerous regulations on hobbyists flying model aircraft too small to pose any realistic threat to anything well below that altitude.