You are missing the point - privately owned will not exist.
Maybe I am, isn't Uber "private"?
Giving out a small landing fee per person makes big $'s on volume for building owner
So how many pax per hour compared to say a terrestial bus carrying 70 people or a train carrying hundreds? If the "volume" is really that high, say a movement every two minutes, think of the noise and traffic management issues.
But to own the worlds transport rights including commercial airspace of all(most) countries
But the airspcace is currently owned, by each nation state? How and why would that change? Are you suggesting the commonwealth will sell airspace to say Westfield?
Perhaps I am missing something but for a company that has yet to make a profit how will they fund even the vehicle development cost?