Southwest Airlines is applying for route authorities to four new cities in Mexico from the new international terminal it is building at Houston’s Hobby Airport (HOU). The carrier also has signaled its intent to fly from HOU to Belize and San Jose, Costa Rica. These route authorities are likely to be granted by the U.S. Transportation Department (DOT). If approved, service on these routes, as well as the Mexico routes, is expected to begin October 2015.