What aircraft is currently designated as Air Force One?

The aircraft currently designated as Air Force One is the B747. This designation refers to a specific aircraft that is used to transport the President of the United States. The B747 has been integral to presidential travel for its long-range capabilities, spacious interior, and advanced technology, which includes communication and defense systems necessary for secure and effective flight.

The choice of the B747 is significant; it has a distinctive humpbacked fuselage that allows for a large passenger capacity and ample room for operational needs. It can also refuel mid-air and is equipped with numerous safety and security features, making it an ideal choice for the president's transport. The aircraft symbolizes the power of the United States and serves as a flying command center, ensuring the president can fulfill duties even while airborne.

Other aircraft listed, such as the B787 and B737, do not meet the required specifications or functionality that the role of Air Force One demands. The A330, while capable and used by other governments, is not the official designation for the President of the United States. Hence, the B747 remains the clear choice for this important role.