It was just a prop, says the Washington Post (via the Howard Dean blog).
The White House are still insisting that the British Airways / Air Force One story is true, even though British Airways are in turn insisting that it isn't. Given that BA have no reason to lie about this...
The whole thing is looking increasingly dodgy. In fact, it's increasingly likely that Bush only slunk into Baghdad for 2 and a half hours, in total secrecy, flying blind for fear of an attack, because Hillary Clinton was due to spend two days in Iraq the next day. The man is a despicable coward, and he deserves to go.