United 93 ending explained (spoilers)

[Aberlagssip]

The passengers of United 93 devise a plan to stop the terrorists by getting two passengers to the front who have both flight and air traffic control experience. They try to keep it quiet for awhile until the terrorist (with the bomb) turns his back on them for a second. The passengers scream and run towards the terrorist, beating him within an inch of his life, and discovering that his bomb was fake. They make their way to the front of the plane, where they fight off the younger terrorist who was kept out of the cockpit. Once they deal with him, the terrorist piloting the plane starts to shake the plane about to stop them from breaking through the cockpit door. After much struggle, the passengers eventually break through the door, and grab the two terrorists flying the plane. The plane plummets into a nosedive and rolls upside down before crashing.