Luis Muñoz Marin International Airport is split into two terminal buildings, Terminal A and Terminal B, C, D and E (which are four concourses in on terminal). All terminal buildings are connected
Terminal A opened in 2012 and was originally exclusively used by US carrier JetBlue. Today, it's used by other airlines such as Copa Airlines and Allegiant. Terminal A is also home to The Lounge San Juan, which is one of two lounges at the airport.
Terminal B, C, D, E
Terminals B, C, D, E are actually concourses and making up the other terminal building at the airport.
Terminal B is used by airlines such as Delta, United, Southwest, Spirit, Air Canada, Allegiant, Frontier and LIAT. It underwent a multi-million renovation in 2014.
Terminal C also underwent a multi-million renovation in 2016, which, like Terminal B, saw a number of restaurants and retail outlets opened at the terminal. Terminal C is where the Avianca VIP airport lounge is located.
Terminal D is currently closed for renovation. Before it closed, it was used by airlines that are part of the OneWorld alliance, including American Airlines.
Terminal E is also currently closed for renovation. Prior to closing, there were no airlines that used this concourse. However, historically, it has been used by American Airlines and American Eagle.