We should have S4, where we are allowed to have one international hub.
i think its a good idea because some major airlines had/have international hubs.
- Trans World Airlines (Paris)
- Pan American World Airways (London/Frankfurt/Tokyo)
- Delta Air Lines (Paris/Tokyo/Amsterdam)
- Jetblue Airways (San Juan)
- Northwest Airlines (Tokyo)
- Air Canada (London)
- Eastern Airlines (San Juan)
- And Many More