So the word on the street is that the White House is looking for somewhere to have the trial of Khalid Sheik Mohammed other than lower Manhattan. I think that's fine.
The Constitution requires that the trial take place in the same district that the crime took place. So anywhere in the Southern District of New York, the Eastern District of Virginia, or the Western District of Pennsylvania will satisfy the Venue Clause. A good argument can be made that since the intended target of United Flight 11 was either the White House or the Capitol, the District Court for the District of Columbia would also be satisfactory. Further, one could argue that since two of the flights originated in Boston, the District of Massachusetts would work too.