The United Airline Flight 93 guestbook is part of the Memorial Chapel, located three miles from the crash site of Flight 93. It is dedicated to the crew who, along with ordinary passengers, resisted the 9/11 hijackers and prevented the aircraft from being used as a weapon (against the Capitol building or White House in Washington, DC). The placard/guestbook was originally located at the crash site as a temporary memorial and later moved to the Memorial Chapel.