At Ground Zero, A City Marks A Tragedy
Americans are paying tribute to those killed in the Sept. 11 attacks 10 years ago. Audie Cornish talks to NPR's Robert Smith. Also, transmissions from American Airlines Flight 11 provide an insight into what happened in the plane that crashed into the North Tower of the World Trade Center. Audie Cornish describes the transmissions. She then talks to NPR's Robert Sigel and Tom Gjelten.