Orlando International Airport (IATA: MCO) is an international airport six miles southeast of Orlando, Florida. It is the second-busiest airport in the state of Florida the 13th-busiest airport in the United States and the 29th-busiest airport in the world by passenger traffic.
The airport serves as a hub for Silver Airways, as well as a focus city for Frontier Airlines, Southwest Airlines, and JetBlue Airways. Southwest is the airport's largest carrier by passengers carried. The airport also is a major international gateway for the mid Florida region, with flights by foreign air carriers.
The airport code MCO stands for the airport's former name, McCoy Air Force Base, a Strategic Air Command (SAC) installation, that was closed in 1975 as part of a general military drawdown following the end of the Vietnam War. Wikipedia