9/11 Timeline: The Attacks on the World Trade Center in New York City – This video is a good, quick summary if you only have a little bit of time to cover 9/11.
9/11: George Bush breaks down his very public initial reaction – BBC
The Todd Beamer Story – Let’s Roll (This video is housed at the History Channel, so I can’t embed it here.)
More on Flight 93 (This one may be too intense for middle schoolers. It has voicemails of people on the plane calling their loved ones.)
