Executive One
Executive One is the call sign designated for any United States civil aircraft when the president of the United States is on board. Typically, the president flies in military aircraft that are under the command of the Presidential Airlift Group, which include Air Force One, Marine One, Navy One, and others. The Presidential Airlift group is part of Air Mobility Command's 89th Airlift Wing, based at Joint Base Andrews (formerly Andrews Air Force Base) near Camp Springs, Maryland in Prince George's County. On December 26, 1973, to "set an example for the rest of the nation  during the current energy crisis" and to "demonstrate his confidence in the airlines", then-President Richard Nixon became the only sitting president to travel on a regularly scheduled commercial airline flight when he flew on a United Airlines DC-10 from Washington Dulles International Airport to Los Angeles International Airport. A Nixon aide carried a suitcase-sized secure communication device on board the plane, so that the President could remain in contact with Washington in the event of an emergency. If the president's family members are aboard, but not the president himself, the flight can, at the discretion of the  White House staff or Secret Service, use the callsign Executive One Foxtrot (EXEC1F). "Foxtrot" is the phonetic alphabet designation for the letter "F", with that being the first letter of "family". The military helicopter that normally has the call sign "Marine One" is assigned the "Executive One" call sign when it transports the outgoing president on their final flight from the Capitol, after the inauguration of their successor, as was done on January 20, 2009 for George W. Bush and on January 20, 2017 for Barack Obama. Executive Two. Executive Two is the call sign designated for any United States  civil aircraft when the vice president of the United States is on board. Typically, however, the vice president flies in military aircraft that are under the command of the Air Mobility Command's 89th Airlift Wing, based at Joint Base Andrews in Prince George's County, Maryland. One notable exception was when Nelson Rockefeller was named Gerald Ford's vice president in 1974. He owned a Grumman Gulfstream II jet that he preferred to the much slower prop powered Convair C-131 Samaritan that was then the primary Air Force Two aircraft. Being a private plane, the Gulfstream's call sign  was "Executive Two" while Rockefeller was in office. On February 2, 2000, a bill was on the Senate agenda that looked as if it might end up in a tie, requiring the vice president to cast the tie breaking vote. A US Airways Shuttle flight was the fastest way to get from New York City, where Vice President Al Gore was, back to the Capitol. As it turned out, his vote was not needed. If the vice president's family members are aboard, but not the vice president himself/herself, the flight can optionally use the callsign Executive Two Foxtrot  just like Executive One Foxtrot.