I think S3-B does have political restrictions, in that case you can only fly within the EU from the new hub/terminal. International routes can only be flown from your home country to non EU countries.
Doesnt seem to allow for this. Home base is BUD and want to build a hub in EDI. I can build the hum and/or terminal but cannot start flights. Maybe I will be able to after May 1989 when Hungary joined the EU?