A woman at that office then calls the airline's emergency line.

NIDIA GONZALEZ: "So far, what I’ve gotten, the number five flight attendant’s been stabbed, but she seems to be breathing. The number one seems to be stabbed pretty badly and she’s lying down on the floor, they don’t know whether she is conscious or not. The other flight attendants are in the back, um, and that’s as far as I know. It seems like the passengers in coach might not be aware of what’s going on right now."

At eighty twenty-four, the voice of hijacker Mohamed Atta was heard over the radio.

MOHAMED ATTA: "Nobody move. Everything will be OK. If you try to make any moves you will injure yourself and the airplane. Just stay quiet."

At eight fifty, controllers in New York received a call from another plane.

UKNOWN PILOT: "Anybody know what that smoke is in lower Manhattan?"

NEW YORK CENTER: "I’m sorry, say again."

UKNOWN PILOT: "Lot of smoke in lower Manhattan."

NEW YORK CENTER: "A lot of smoke in lower Manhattan?"

UKNOWN PILOT: "Coming out of the, ah, top of the World Trade Center building, a major fire."

Air traffic controllers had already informed the military about the hijacking.

CONTROLLER: "We have, ah, a problem here, we have a hijacked aircraft headed towards New, New York and we need you guys to, we need someone to scramble some F-16s or something up there to help us out."