Agree. Imagine if someone claimed dominion over a chunk of the sky or an acre of water. You'd call him a fool and ignore him. The only way land is different is that it's easier to demarcate.
Nations, but people and corporations aren't nations. Can apply institute a no fly-zone over their HQ?
Edit: meaning land, air, water should belong to the people of said nation, and should be taxed as such and divided out to the people as guaranteed basic income.
I'd say the purpose of a nation is to manage resources, which are often natural resources.
Some locales have deeds for land have time limits; you don't own the land, you have been granted rights to it.
Sometimes the FAA will limit airspace usage for private property, for instance restricting airspace around stadiums during sporting events.
You're right that a corporation can't unilaterally declare the airspace over their land their headquarters sits on as a no-fly zone. But the government may still work with them on policy.
