Southwest Airlines has applied with the U.S. Department of Transportation to fly from Houston’s Hobby Airport to four destinations in Mexico (Cancun, Mexico City, Puerto Vallarta and Los Cabos) as well as to Belize City and San Jose, Costa Rica. The flights would originate from a $156 million, five-gate international concourse scheduled to open in October 2015. All three countries are in Reefs to Rockies’ portfolio of destinations.