Similar to the president aboard Air Force One, the designation of Air Force Two refers to any plane carrying the vice president, not a specific jet or model.Over the years, several different planes have carried the Air Force Two title, transporting vice presidents and their staff around the world. The most commonly-used jet today is a C-32, a customized military version of a commercial Boeing 757-200 plane.The president and vice president don't travel together for security reasons, according to The New York Times.Service members are required to salute the president as commander-in-chief, but not the vice president, according to AP. Still, it's customary for troops to salute vice presidents, as well.Nixon, who served as President Dwight D. Eisenhower's vice president, flew on a Boeing VC-137A Stratoliner to visit the USSR in 1959. The jet was first used by President Gerald Ford's vice president, Nelson Rockefeller.The plane was retired from service during the Bush administration in 2005 and placed up for auction by the General Services Administration in 2013, according to USA TODAY.Gore worked on his acceptance speech for the 2000 Democratic National Convention aboard Air Force Two.The clock featured the time in Washington, DC, and whatever destination Air Force Two was bound for.Biden traveled over one million miles on Air Force Two during his time as vice president. The updated C-32 plane featured a communications center and private stateroom with a fold-out bed.Staffers celebrated the vice president's birthday with streamers and balloons aboard the jet.Harris brought cupcakes and sang Happy Birthday to her domestic policy advisor Kate Childs Graham in 2021.Emhoff filled out his March Madness basketball bracket en route to Las Vegas in March 2021.Vice presidents and staff occasionally hold informal briefings with reporters known as press gaggles aboard Air Force Two.The rear cabin also contains a galley, two bathrooms, and closets.