There are officially two Air Force One aircraft that are specifically designated for the President of the United States. These are two highly customized Boeing 747-200B jumbo jets with tail numbers 28000 and 29000, also known as VC-25A. When the President is aboard any U.S. Air Force plane, that plane is given the radio call sign "Air Force One," but the two Boeing 747s are the primary and most recognized aircraft used for presidential travel.

In summary:

• Official Air Force One planes: 2 (Boeing 747-200B, VC-25A, tail numbers 28000 and 29000)
• Any Air Force plane carrying the President can be called Air Force One by radio call sign, but the two 747s are the main aircraft commonly referred to by that name.