The front section of the aircraft is informally called the "White House", a reference to the president's official residence in Washington, D.C. The president's executive suite includes sleeping quarters with two couches that can be converted into beds, lavatory and shower, vanity, double sink, and a private office, or the president's "Oval Office aboard Air Force One". If necessary, the president can address the nation from the office. This capability was added after the September 11 attacks, during which the aircraft had to land at Barksdale Air Force Base for President George W. Bush to address the nation. These offices, including the president's suite, are mostly located on the starboard (right) side, and a long corridor runs along the port (left) side. The aircraft also contains a conference room, originally designed as a situation room, but now used for meeting with staff while traveling. This room includes a 50-inch plasma screen television which can be used for teleconferencing. The aircraft has fully equipped office areas with telecommunication systems (including 87 telephones and 19 televisions).