Pentagon Army Heliport is a military heliport serving the Pentagon. It consists of a single pentagon-shaped helipad and is located on the northern side of the Pentagon building. It is used for ferrying VIPs such as military leaders and foreign guests to and from the Pentagon by helicopter or tilt-rotor aircraft. It replaced a previous helipad on the west side of the building adjacent to the impact site of the hijacked American Airlines Flight 77 on 11 September 2001 and which was closed to create the National 9/11 Pentagon Memorial.