Why is there so little mention of the passengers on Flight 93?

That is the plane whose passengers rose up against the hijackers on 9/11. I think it was a highly courageous act. Even if they figured that they were going to die anyway, there was no way that they could be 100% certain and there was not a whole lot of time for them to act. Do we know where the hijackers planned to take the plane? I wonder how many potential casualties were prevented.