<P> MIA has a number of air cargo facilities . The largest cargo complex is located on the west side of the airport, inside the triangle formed by Runways 12 / 30 and 9 / 27 . Cargo carriers such as LAN Cargo, Atlas Air, Southern Air, Amerijet International and DHL operate from this area . The largest privately owned facility is the Centurion Cargo complex in the northeast corner of the airport, with over 51,000 m (550,000 sq ft) of warehouse space . FedEx and UPS operate their own facilities in the northwest corner of the airport, off of 36th Street . In addition to its large passenger terminal in Concourse D, American Airlines operates a maintenance base to the east of Concourse D, centered around a semicircular hangar originally used by National Airlines which can accommodate three widebody aircraft . </P> <P> Fire protection at the airport is provided by Miami - Dade Fire Rescue Department Station 12 . </P> <P> The airport has 131 gates in total . The main terminal at MIA dates back to 1959, with several new additions . Semicircular in shape, the terminal has one linear concourse (Concourse D) and five pier - shaped concourses, lettered counter-clockwise from E to J (Concourse A is now part of Concourse D; Concourses B and C were demolished so that Concourse D gates could be added in their place; naming of Concourse I was skipped to avoid confusion with the number 1 .). From the terminal's opening until the mid-1970s the concourses were numbered clockwise from 1 to 6 . </P> <P> Level 1 of the terminal contains baggage carousels and ground transportation access . Level 2 contains ticketing / check - in, shopping and dining, and access to the concourses . The airport currently has two immigration and customs facilities (FIS), located in Concourse D, Level 3 and in Concourse J, Level 3 . The Concourse D FIS can be utilized by flights arriving at all gates in Concourse E and all gates in Concourses D and some gates in Concourse F. The Concourse J FIS can be utilized by flights arriving at all gates in Concourse J and most gates in Concourse H. However, all gates in Concourse G and some gates in Concourses F and H, do not have the facilities to route passengers to any FIS, and therefore can only be used for domestic arrivals . MIA is unique among American airports in that all of its facilities are common - use, meaning that they are assigned by the airport and no one airline holds ownership or leases on any terminal space or gates, thus giving the airport much more flexibility in terminal and gate assignments and allowing it to make full use of existing facilities . The entire airport became common - use by the 1990s . </P>

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