President Barack Obama waves as he boards Air Force One at Joint Base Andrews, Md., for departure to Miami, Fla., Oct. 11, 2012.

President Barack Obama waves as he boards Air Force One at Joint Base Andrews, Md., for departure to Miami, Fla., Oct. 11, 2012.

President Barack Obama arrives at Joint Base Andrews via Marine One, Aug. 31, 2012, before boarding Air Force One for a flight to Fort Bliss in El Paso, Texas.

President Barack Obama arrives at Joint Base Andrews via Marine One, Aug. 31, 2012, before boarding Air Force One for a flight to Fort Bliss in El Paso, Texas.

President Barack Obama disembarks Air Force One upon arrival at Joint Base Andrews, Md., Aug. 18, 2012.

President Barack Obama disembarks Air Force One upon arrival at Joint Base Andrews, Md., Aug. 18, 2012.