Florida's busiest airport is Orlando International Airport (OIA). Located in the city of Orlando, OIA is the busiest airport in the state of Florida and the tenth busiest airport in the United States. It serves over 45 million passengers annually and is a major hub for Southwest Airlines. OIA is also home to the largest rental car center in the world. The airport offers flights to over 100 destinations around the world and is a major gateway to the Caribbean and Latin America.