Nope - can't guess.
Also from that article:
"The (911) commission may have failed to explore these matters for the same reason it suppressed testimony from a former FBI translator, Sibel Edmonds. She said a foreign organization had penetrated the FBI's translator program. "Miguel also notes:
great points all round. perhaps that's the reason 'al qaeda' knew to go into play on the same day that all those NORAD exercises were taking place.
dare we call it treason?