Oh yeah, I forgot this,
There is this really great program on the History Channel, or maybe it was the some sister network to the History Channel (it was on digital cable), but it was a 2 hr show detailing 9-11 and went into a lot of the backstory right up to the events.
I’ve only seen parts of it, but it was really good, and it might provide some of the details you are looking for.
It aired around 9-11 this year and I’m sure gets a fair amount of replay (if you know someone with digital cable), so you might want to keep your eye out for that.