The limousine that the President travels in is maintained by the Secret Service while the motorcade support vehicles are maintained by the White House Military Office.
The suspicion that civilians--or high-ranking White House officials--may have been on the flight is the result, in part, of the involvement of Louis Caldera, the Obama administration's director of the White House Military Office.
Louis Caldera, the chief of the White House military office, resigned Friday, over a flight by a jet used as Air Force One over New York, which sparked panicked memories of the September 11 attacks.
The White House Military Office apologized for the mission, which infuriated New York City officials and prompted hundreds of financial professionals to flee their office buildings.
