Our agreements do not refer to regional or secondary airports or international hubs. In its other part, the Blue Sky policy indicates that it can be applied in a limited number of Canadian cities, but that it will do the choosing. If it is an “open skies” type of agreement, there is no limit. The foreign carrier may go wherever it wants to.
For an airport to offer international service, it must have certain basic services, such as customs and immigration.
This is a question for the Canada Border Services Agency, since it is responsible for that. I know that a strategy has been put in place to extend these services.