The communication gaps that delayed the U.S. military response on September 11

History · Published 6 October 2026 Swipe more like this →

In short: On the morning of September 11, 2001, a series of systemic failures in communication and radar tracking meant that the U.S. military was often reacting to outdated information. From phantom flights to switched-off transponders, the response was a frantic race against a clock that was already running out.

The primary obstacle for the North American Aerospace Defense Command (NORAD) was the loss of aircraft identification. Hijackers on four commercial flights switched off transponders or changed codes, making it nearly impossible for the Northeast Air Defense Sector (NEADS) to track them via radar. While the FAA had access to some data, they struggled to relay accurate positions to the military by phone. This lack of real-time data meant that even when technicians spotted planes, they often could not confirm which aircraft they were seeing, leading to critical delays in identifying targets.

Specific instances of communication breakdowns illustrate the chaos. When Flight 11 was hijacked, the FAA did not notify NORAD in time for escort aircraft to reach the plane. Two F-15s from Otis Air National Guard Base were ordered to scramble only at 08:46, the exact moment Flight 11 struck the North Tower; they did not take flight until 08:53. Furthermore, an erroneous report of a "phantom Flight 11" heading toward Washington caused three fighters from Langley Air Force Base to scramble. Due to poor communications, these pilots were never briefed on their destination and flew east toward the ocean instead of toward the capital.

The military response was further complicated by civilian traffic concerns and misinformation. After Flight 175 hit the South Tower, the Otis fighters were initially ordered to hold off over Manhattan because the FAA feared collisions with the 200 flights that averaged 24 hours over the Hudson River. They remained in a holding pattern until the airspace was cleared. Additionally, a late report at 09:21 erroneously suggested Flight 11 was still in the air heading for Washington, causing a second scramble of Langley fighters. These layers of technical, procedural, and communicative friction defined the first hours of the military's response.

Ultimately, the 9/11 Commission determined that the lack of timely notification and the inability to distinguish between hijacked and civilian aircraft significantly hindered the defense. The Secret Service was one of the few entities able to maintain a real-time track of two hijacked aircraft approaching Washington by activating an open line with the FAA, highlighting how fragmented information flow can impact national security.

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