thats kinda the thing though... apparently we were tracking the guys but didn't really know what they were up to. At the time its hard to just pin shyt on people.The reason its classified is cuz if the Saudis planned it, then other countries' intelligence networks would have probably known about the attacks in advance... which would fit with the idea that our government allowed (not saying they planned it) it to happen... and the stories about Jews not showing up to work that day.
Dont hold your breath waiting for Obama to release this info to the public.