NOTE: this is not just for the Starport territory, but includes "Other" territories ceded to Imperial use. Since Fiefs are ceded for imperial use, it would appear that such territories are included by the above.
Just saying...
In another thread, you referred to this as a "bomb," as if you think it will somehow discombobulate the various models people have proposed here. But I don't think it does.
Everyone I think would agree that territory "ceded for Imperial use" would be extraterritorial. This would include not only starports but also consular offices, offices of various services, Imperial civil service offices, and so on. But it does not necessarily include fiefs. This is your assumption. You seem to view fiefs as the local compounds where nobles live. I on the other hand view them as properties owned by nobles, or managed by nobles on behalf of the Emperor, usually as income-generating properties. I am not very far from Lycanorukke's view:
The land was _owned_ by the ruler but _administered_ by the noble ... It could be literally anything and definetly not one big chunk. A few km^2 of an industrial park here, 1000km^2 area with a mine there, a few hectares of a turnip plantation, etc.
T5 supports this, noting that land grants usually come from worlds suitable for development. It is not in anyone's interest that these properties be extraterritorial, as they need to be fully integrated with the local economy, and those turnips will be farmed using local labour.
The actual estate on which the noble lives will be treated as extraterritorial, in my view, but not because it is ceded for Imperial use. It is extraterritorial because the noble is considered extraterritorial
in his person. If he rents a hotel room, the local police have no authority to search it. But I suggest this is often more a matter of convention than a matter of law.
I would distinguish between several different concepts here. There is Imperial privilege, which places nobles themselves above local laws. There is the extrality of territory ceded for Imperial use. And then there is the simple ownership of land by nobles or even the emperor, which need not necessarily render that land extraterritorial any more than a noble's investments are extraterritorial.
In short, this doesn't introduce a new concept, so far as I can see. It all hinges on our varying interpretations of what a fief actually is.
As a consequence of this observation, there are clearly differences between someone born and raised on such a world that executes people for offenses that are not deemed to be offenses, let alone capital offenses on theirs.
I'm puzzled by your concept of citizenship. Citizenship does not grant extraterritorial rights or privileges, yet you seem to be asserting that in the Imperium, it does. That is, you seem to be saying that if I am an Imperial citizen, then I am protected from execution under the laws of Someworld, should I commit a crime there.
This is not how citizenship works in the world we know. When I visit another country, I enjoy only the rights granted by that country, and am fully subject to that country's laws. So, using the normal concept of citizenship, and assuming there are "Imperial citizens" (which IMTU, there are not), an Imperial citizen who commits a capital crime on Someworld gets executed.
If a world is deemed to be an Imperial Member World, but is entitled to have its own laws, wage war against other Imperial Member worlds etc - then is such a world capable of having "Sanctuary laws" that forbid the extradition of "Criminals" designated by worlds they deem abusive?
This doesn't have to be complicated. Under extradition agreements, one Nation A will usually only be able to extradite a person from Nation B if the crime he is wanted for would also be a crime in Nation B. The Traveller Adventure tells us something similar: that the Imperium respects local laws to the extent that it will act to extradite a person to any world where he is wanted, with the proviso that by convention, the Imperium will ignore its obligations if the offence exists only under some weird local law.
IMTU, the Imperium will require any member world to return you to Pysadi for trial if you are wanted for a crime that is an offence under Imperial law, such as murder, and will apply the same rule when you are within Imperial territory i.e., space & extraterritorial possessions. But if world A wants to extradite a person from world B for some weird, purely local offence, then this is a diplomatic matter between worlds and is beneath the Emperor's notice. If you find yourself in Imperial custody, you will be returned to Pysadi for tickling an anole.
If someone says "The Imperial Law requires this" would imply that Imperial Laws can trump local laws ... Ironically enough, that comes under the heading of "IMTU" simply because nothing (to my knowledge) specifies this in the OTU.
The Warrant of Restoration specifies that Imperial law trumps local law. That's the basis of my view of extradition, above.
The only way I can justify the Imperials have an Imperial Culture to grow up within, is to have enclaves where Local Laws do not touch those born in the Enclaves.
I suggest taking a closer look at how our own cultures operate. We have numerous subcultures, which are often foreign to each other. The culture of English private schoolboys is far removed from the Black Country working class, although all are governed by the same laws. Indeed, without wishing to activate Aramis's thread hammer, I'll point out that we have a culture war today: a conflict between cultures with starkly different values, raised in the same nations under the same laws. (And I will not discuss this, other than to observe its existence.)
If you grow up surrounded by a culture, you take on aspects of that culture (aka going native).
Do nobles grow up on whatever backwater world, or are they sent to private schools for years at a time, there to rub shoulders with the children of an ultra-rich interstellar class?
Again, we're dealing with dueling assumptions about how and where nobles live.