FAA: Hi. Boston Center TMU [Traffic Management Unit], we have a problem here. We have a hijacked aircraft headed towards New York, and we need you guys to, we need someone to scramble some F-16s or something up there, help us out.

NEADS: Is this real-world or exercise?

FAA: No, this is not an exercise, not a test.¹¹⁶

NEADS ordered to battle stations the two F-15 alert aircraft at Otis Air Force Base in Falmouth, Massachusetts, 153 miles away from New York City. The air defense of America began with this call.¹¹⁷

At NEADS, the report of the hijacking was relayed immediately to Battle Commander Colonel Robert Marr. After ordering the Otis fighters to battle stations, Colonel Marr phoned Major General Larry Arnold, commanding general of the First Air Force and NORAD's Continental Region. Marr sought authorization to scramble the Otis fighters. General Arnold later recalled instructing Marr to "go ahead and scramble them, and we'll get authorities later." General Arnold then called NORAD headquarters to report.¹¹⁸

F-15 fighters were scrambled at 8:46 from Otis Air Force Base. But NEADS did not know where to send the alert fighter aircraft, and the officer directing the fighters pressed for more information: "I don't know where I'm scrambling these guys to. I need a direction, a destination." Because the hijackers had turned off the plane's transponder, NEADS personnel spent the next minutes searching their radar scopes for the primary radar return. American 11 struck the North Tower at 8:46. Shortly after 8:50, while NEADS personnel were still trying to locate the flight, word reached them that a plane had hit the World Trade Center.¹¹⁹

Radar data show the Otis fighters were airborne at 8:53. Lacking a target, they were vectored toward military-controlled airspace off the Long Island coast. To avoid New York area air traffic and uncertain about what to do, the fighters were brought down to military airspace to "hold as needed. "From 9:09 to 9:13, the Otis fighters stayed in this holding pattern.¹²⁰

In summary, NEADS received notice of the hijacking nine minutes before it struck the North Tower. That nine minutes' notice before impact was the most the military would receive of any of the four hijackings.¹²¹

United Airlines Flight 175 FAA Awareness. One of the last transmissions from United Airlines Flight 175 is, in retrospect, chilling. By 8:40, controllers at the FAA's New York Center were seeking information on American 11. At approximately 8:42, shortly after entering New York Center's airspace, the pilot of United 175 broke in with the following transmission:

UAL 175: New York UAL 175 heavy.

FAA: UAL 175 go ahead.

UAL 175:Yeah.We figured we'd wait to go to your center.Ah, we hearda suspicious transmission on our departure out of Boston, ah, with someone, ah, it sounded like someone keyed the mikes and said ah everyone ah stay in your seats.

FAA: Oh, okay. I'll pass that along over here.¹²²

Minutes later, United 175 turned southwest without clearance from air traffic control. At 8:47, seconds after the impact of American 11, United 175's transponder code changed, and then changed again. These changes were not noticed for several minutes, however, because the same New York Center controller was assigned to both American 11 and United 175.The controller knew American 11 was hijacked; he was focused on searching for it after the aircraft disappeared at 8:46.¹²³