US Air Force
Boeing VC-137C SAM 26000, or Air Force One, during its final flight, at the National Museum of the United States Air Force, Dayton, Ohio, May 20, 1998.
On October 19, 1962, Boeing delivered a highly modified version of the civilian 707-320B airliner with the serial number 62-26000. It would be tasked with Special Air Missions, and its call sign would be "SAM Two-six-thousand."
It was the first jet aircraft built specifically for use by the US president, whose presence prompted the call sign to change to "Air Force One," which had been adopted in 1953 for use by planes carrying the president.
The SAM 26000 would carry eight presidents during its 36-year career - John F. Kennedy, Lyndon Johnson, Richard Nixon, Gerald Ford, Jimmy Carter, Ronald Reagan, George H.W. Bush, and Bill Clinton - as well as countless heads of state, diplomats, and dignitaries.
"A person could justify that it's the most important historical airplane in the world," Air Force historian Jeff Underwood told CNN in 2013. "It's a place in history that moves. Every time I get on board, that's what I think about."
Below, you can take a tour through the SAM 26000, which is now on display at the National Museum of the Air Force at Wright-Patterson Air Force Base, near Dayton, Ohio.