That only explains their right to govern airspace, not that they own it. As I mentioned, the only reason to own something is so you can give it to someone else. There is simply no need to give airspace to someone else in the form of ownership. Mearly having the ability to regulate it is enough. Airspace starts 1” off some one’s property. Having the federal government actually own that area would mean everyone would be trespassing and using Federally owned airspace every day. That makes no sense and as mentioned, not needed. The Causby case furthers non-ownership in that Federal planes can be guilty of trespass against a property owner if they interfere with the use of that person’s land (as pointed out, an “aerial trespass”).
If the Federal government owned airspace we’d be buying/leasing it from them every time anyone built into that area. That does not happen. Permits are needed so that local municipalities can make sure construction laws are followed. If I want to put an antenna on my roof, I don’t buy/least that airspace from the Federal government.
There is one view listed in the attachment, that there is no ownership of airspace (#2). There is a case with the court of appeals with this info:
The Court of Appeals said: "We own so much of the space above the ground as we can occupy or make use of, in connection with the enjoyment of our land. This right is not fixed. It varies with our varying needs and is co-extensive with them. The owner of the land owns as much of the space above him as he uses, but only so long as he uses it. All that lies beyond belongs to the world."
There is confusion on this issue even today and a reason for this confusion… it is unclear who owns airspace and how much. The reason there is case law to some degree on this is precisely because there is no statutory law on who owns what airspace. If there were, these issues with not exist.
All of this points to the Federal government not owning airspace, only regulating it. There is no law that can be cited stating that the Federal government does own airspace because they do not.