Yeah, that Prague. The one where the CIA said that atta didn't meet with the iraqi secret service that the Czechs were tailing.
I think that the so-called 9/11 Commission actually recognizes and admits that Atta took two known trips to Prague, but then makes the rather preposterous argument that he couldn't possibly have made that one extra trip to Prague because his cell phone was used in America during that time, even though his cell phone wouldn't have worked in Prague, he would have no reason to take it there with him, and nobody has any way of knowing that it was actually him using the cell phone.