The plane that carries the President of the United States is referred to as Air Force One. That call sign was first used during President Eisenhower's administration and has stuck. According to recent news releases emanating from the U.S. Air Force, the President's plane, a customized Boeing 747-200B series, is soon to be replaced with a new Boeing 747-B. The current Air Force One is capable of refueling in mid-air, and has more than 4,000 square feet of space. It even boasts an operating room and galleys that can serve up to 100 people simultaneously. The current Air Force One has been in service since 1990 during the administration of President George H.W. Bush. The plane is estimated to have a lifespan of 30 years.