amcarrig you make good points but:
1. How could you possibly know that "most of the crew on those planes were dead" Nobody knows that information for sure yet, let alone John Q Public
2. I did not say it wasn't a "terrorist act" the point I was making is that it may not be an assumed terrorist group, such as the PLO, Hamas, Bin Laden, etc.
3. The US intelligence probably has info on DOZENS of proposed terrorist attacks, many of which they thwart in advance. Just because they had some info on a Bin Laden conspiracy, doesn't mean the attacks yesterday were related.
4. This is the single most reason why an American COULD pull off such and event. The rest of the country is so arrogant (or ignorant) to believe that it "could never happen" that it would make it that much easier for a national to organize and complete. While everyone is looking out the windows at the organized terrorist groups and scrutinizing Middle-Eastern people, nobody has been watching what's going on inside the house!
5. I have no doubt that skilled individuals , capable of flying a commercial jetliner, exist within organized terrorist groups. (As I mentioned in my original post)