Well, the book says 'public starports'. Private starports are a different matter entirely, and the Imperium wouldn't enforce any extraterritoriality at those sites. So I guess that would depend on how the mega-corp or private firm negotiated with the member world or non-member world. But I think without the Imperium having some control over that world's starport, things could get out of hand very quickly for someone who lands at that starport. It would be very easy for the locals to take over the starport if they are in control of it. Terrorists, etc... would have easy access to the people and ships at the starport. The Imperium would almost have to have some level of control just to let ships from other planets land there.
Dameon
Dameon