Air Force One is the official air traffic control call sign for a United States Air Force aircraft carrying the President of the United States.
Air traffic control is a service provided by ground-based controllers who direct aircraft on the ground and through controlled airspace, and can provide advisory services to aircraft in non-controlled airspace.
The United States Air Force is the aerial warfare service branch of the United States Armed Forces and one of the seven American uniformed services.
The President of the United States is the elected head of state and head of government of the United States.
On Board Air Force One September 11, 2001, as events unfold by TopGunMilitary
In common parlance the term describes those Air Force aircraft designed, built, and used to transport the president.
Us Air Force Documentary: Inside Air Force One by Daily Science
The idea of designating specific military aircraft to transport the President arose in 1943, when officials of the United States Army Air Forces, the predecessor to the U.S. Air Force, became concerned with relying on commercial airlines to transport the president.
The United States Army Air Forces were the military aviation service of the United States of America during and immediately after World War II, successor to the United States Army Air Corps and the direct predecessor of the United States Air Force.
A C-87 Liberator Express was reconfigured for use as a presidential transport, but the Secret Service rejected it because of its safety record.
A C-54 Skymaster was then converted for presidential use; this aircraft, dubbed the Sacred Cow, carried President Franklin D. Roosevelt to the Yalta Conference in February 1945, and was subsequently used for another two years by President Harry S. Truman.
The Yalta Conference, sometimes called the Crimea Conference and codenamed the Argonaut Conference, held from February 4 to 11, 1945, was the World War II meeting of the heads of government of the United States, the United Kingdom and the Soviet Union, represented by President Franklin D. Roosevelt, Prime Minister Winston Churchill and Premier Joseph Stalin, respectively, for the purpose of discussing Europe's post-war reorganization.
Franklin Delano Roosevelt, commonly known as FDR, was an American statesman and political leader who served as the 32nd President of the United States from 1933 until his death in 1945.
The "Air Force One" call sign was created after a 1953 incident during which a Lockheed Constellation named Columbine II, carrying President Dwight D. Eisenhower, entered the same airspace as a commercial airline flight using the same call sign.
Columbine II is a Lockheed VC-121A-LO Constellation ; the aircraft that was to become the first plane to use the Air Force One callsign and the only Presidential aircraft ever sold to a private party.
The Lockheed Constellation was a propeller-driven, four-engined airliner built by Lockheed Corporation between 1943 and 1958 at Burbank, California.
Dwight David "Ike" Eisenhower was an American politician and general who served as the 34th President of the United States from 1953 until 1961.
A number of aircraft types have been used as Air Force One since the creation of the presidential fleet, starting with two Lockheed Constellations in the late 1950s: Columbine II and Columbine III. It also has included two Boeing 707s, introduced in the 1960s and 1970s; since 1990, the presidential fleet has comprised two Boeing VC-25As, which are specifically configured, highly customized Boeing 747-200B series aircraft.
The Boeing VC-25 is a military version of the Boeing 747 airliner, modified for presidential transport and operated by the United States Air Force as Air Force One, the call sign of any U.S. Air Force aircraft carrying the President of the United States.
The Boeing 707 is a mid-sized, long-range, narrow-body, four-engine jet airliner built by Boeing Commercial Airplanes from 1958 to 1979.
Year 747 was a common year starting on Sunday of the Julian calendar.