did any of the passengers stood up against the terrorists?
Yes there was a passenger revolt and as the revolt began and the hijackers started maneuvering the plane violently
United Airlines Flight 93
The passenger revolt on Flight93 began at 09:57, after the passengers voted on whether to act. By this time, Flight77 had struck the Pentagon and Flights 11 and 175 had struck the World Trade Center towers. As the revolt began and the hijackers started maneuvering the plane violently, the plane left its Washington, D.C. course. The hijackers in the cockpit became aware of the revolt at 0
where did the 3rd plane crash on 911 It crashed into a field in Somerset County, Pennsylvania who hijacked it? By four al-Qaeda terrorists on board what was the flight's real target? Since it never reached a target, the exact place intended to be hit by Flight93 has never been decisively confirmed was there any structure made in the memories of the deceased? Yes a  white marble Wall of Names was dedicated
wiki:19657424
United Airlines Flight 93 [SEP] Passenger revolt
The passenger revolt on Flight93 began at 09:57, after the passengers voted on whether to act. By this time, Flight77 had struck the Pentagon and Flights 11 and 175 had struck the World Trade Center towers. As the revolt began and the hijackers started maneuvering the plane violently, the plane left its Washington, D.C. course. The hijackers in the cockpit became aware of the revolt at 09:57:55, Jarrah exclaiming, "Is there something? A fight?" Edward Felt dialed 9-1-1 from his cell phone from the rear lavatory of the aircraft seeking information at 09:58. His call was answered by dispatcher John Shaw, and Felt was able to tell him about the hijacking before the call was disconnected.