BWI Airport is already Southwest's biggest East Coast hub, and third biggest nationally.
Metro D.C. residents that travel internationally may see their options expand over the next few years.
Baltimore-Washington Thurgood Marshall Airport could regain some of the international traffic it has lost in recent years, but it needs help from Southwest Airlines, which now accounts for more than 70 percent of BWI's passenger load.
Southwest, through its AirTran affiliate, is reportedly seeking to aggressively increase its international flights by 2015. It recently paid $156 million for an international terminal in Houston, and BWI officials think that as the third-largest hub for Southwest nationally and the number one hub on the East Coast it could play a major role in handling any additional international flights.
At this point Southwest Airlines has not commented officially on any international expansion plans.