[El Gato]

Which ever plane the President goes in, is it called Air Force One? I think I have heard that whatever plane he is in is called AF1.

From http://www.fas.org/man/dod-101/sys/ac/vc-25.htm:

"The mission of the VC-25A aircraft -- Air Force One -- is to provide air transport for the president of the United States. The presidential air transport fleet consists of two specially configured Boeing 747-200B's -- tail numbers 28000 and 29000 -- with the Air Force designation VC-25A. When the president is aboard either aircraft, or any Air Force aircraft, the radio call sign is "Air Force One."

When he landed onboard the carrier, the plane was "Navy One", and the chopper he flies in routinely is "Marine One", again when the President is onboard.

[nicmarlo]

I believe that the President was flying TO Baghdad in AF1 (the 747) as it has been reported that a British pilot, who spotted AF1 in the air, asked the AF1 pilot "is that AF1" to which the President's pilot said "no, it's a gulfstream 9." The British pilot reportedly understanding something was up merely said "oh."