The current two AF-1's are VC-25s, specially configured Boeing 747-200Bs. Boeing is phasing out the 747, but the AF-1 specs call for a 4 engine plane. The only other option is the A380, which is more limited in which airports can handle it, and, not being an American plane, would really not be a likely choice. http://news.yahoo.com/u-air-force-picks-boeing-747-8-replace-200607308--finance.html "The Boeing 747-8 is the only aircraft manufactured in the United States (that) when fully missionized meets the necessary capabilities established to execute the presidential support mission," said Air Force Secretary Deborah James in a statement. Boeing welcomed the Air Force's decision to skip a competition and opt for the 747-8, citing its 50-year history of building presidential aircraft. The Air Force said it intended to award a sole source contract to Boeing, but they must still negotiate a contract and the modifications needed to adapt the jet for presidential use.