There are restricted Flight paths. One in particular is around the white house. Any aircraft in these areas will be escorted to the nearset landing strip by military fighter jets.. If they refuse to land yes OUR miltary has the permission of the president himself to shoot down said aircraft. Further more, Presdient Bush recently orderded that any aircraft commercial or personal that deviates from it's intended flight path is to be escorted by miltary aircraft to the nearest landing strip. Failure to comply with the miltary in this matter will result in the aircraft being destroyed. It may sound barbareic, but the idea was to protect ground civilians from future attacks. I saw this on the news just last night.
Tobey