I was wondering about the guys who flew the planes into the towers on 9/11. Did they ever figure out exactly who they were?

As I recall there was some question as to whether or not some of them were using an alias was this ever determined?

If they were using an alias how did they get credit for what they did within the radical communities?

And if they did get credit would that not mean that somebody knows who they are even if they were using aliases and false documents.