This is going to sound insane, but are aircraft registration patterns defined at the player or base level? i.e. if I HQ in the US and open a base in Hong Kong, will all those aircraft in Hong Kong have an N123AB registration pattern because my HQ is in the US or it will be B-HAB because they're in Hong Kong? I assume I'm not the only one that uses registration numbers to keep things organized which is why I'm asking in advance...