American Airlines Flight 11: ATC Recording From the Hijacking

September 11, 2001 — American Airlines Flight 11 — FAA ATC and NORAD records

The available recording for American Airlines Flight 11 is not an ordinary flight-safety incident. It is a collection of FAA, NORAD and airline recordings from the morning of September 11, 2001, preserved as part of the documentary record of the attacks. The correct reconstruction is therefore about what the air-traffic record shows, not about recreating unverified cockpit events.

The ATC record shows the picture changing minute by minute

The 9/11 Commission's reconstruction places American Airlines Flight 11's departure from Boston at 7:59 a.m. with 81 passengers and 11 crewmembers. The flight's last routine response to Boston Center came at about 8:13. Subsequent instructions received no response.

At 8:21, the aircraft's transponder was turned off. Boston Center initially treated the event as a possible communications or equipment problem rather than a confirmed hijacking. Controllers tried repeatedly to contact the aircraft and began moving other traffic away from its path.

At 8:24:38, a transmission from the aircraft indicated that people aboard were being ordered to remain quiet. A second transmission followed seconds later. The controller and supervisor then recognized that the aircraft had been hijacked and escalated the information through FAA management.

At 8:28, Boston Center notified the FAA Command Center that it believed Flight 11 had been hijacked and was heading toward New York. At 8:37:52, Boston Center reached NEADS and requested military assistance. The sequence shows officials acting on information as it arrived rather than with the complete picture that became available later.

The later investigation was able to place the ATC response in a broader sequence. Boston Center moved other aircraft away from Flight 11's path and sought assistance from nearby aircraft before the hijacking was fully confirmed. The Command Center then established a conference link between Boston, New York and Cleveland centers so the information could be shared as the aircraft moved south. The military notification at 8:37:52 was therefore the result of a chain of FAA communications that had already begun several minutes earlier. The ATC record is valuable precisely because it preserves those intermediate decisions.

The record also shows that FAA personnel were trying to verify the aircraft's status through several channels. Controllers asked nearby aircraft to look for the Boeing 767 and moved traffic away from its projected path. Once the hijacking was recognized, Boston Center passed the information to other centers and FAA management before contacting the military. The chronology matters because it shows the response developing through multiple information handoffs.

The 9/11 Commission also records that controllers did not initially understand the first hijacker transmission because the message was partly unintelligible. The later transmission made the situation clearer. That progression is why the ATC record is more informative than a retrospective statement that the hijacking was immediately recognized.

“A selection of audio recordings from the Federal Aviation Administration (F.A.A.), North American Aerospace Defense Command (Norad) and American Airlines from the morning of Sept.”

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