The Metropolitan Area is served by two airports. The Luis Muñoz Marín International Airport, San Juan's primary commercial airport, is located eight miles () from Old San Juan in the neighboring municipality of Carolina. The airport accommodates more than 30 domestic and international airlines and is the busiest airport in the Caribbean. It is often referred to as "The Gateway to the Caribbean" because it serves as the main connection to the island and the rest of the Caribbean for the United States and vice versa. The area's secondary airport is the Fernando Ribas Dominicci Airport, which is located directly across the San Antonio Creek or ''Cano San Antonio'' from Old San Juan in the Isla Grande district. Dominicci Airport is used mainly by general aviation aircraft, charter flights, and some domestic commercial flights. It used to be the city's and also the island of Puerto Rico's main international gateway until the opening of Luis Muñoz Marin International Airport. It is now also widely used by the Isla Grande Flight School and Caribbean Flight Center, the only flight school on the island.