Jacksonville Air Route Traffic Control Center

The FAA’s Jacksonville Center informs the pilot of Air Force One that an unidentified aircraft is heading toward his plane, and this aircraft is out of radio contact, has its transponder off, and might be another hijacking. Air Force One is currently flying toward Gainesville in northern Florida. [CBS News, 9/11/2002; CBS News, 1/17/2009; Peter Schnall, 1/25/2009] Colonel Mark Tillman, the pilot of Air Force One, has just been informed that President Bush, who is on the plane, has been called by Vice President Dick Cheney, and Cheney told the president that an anonymous threat has been phoned into the White House, stating that Air Force One is the next target (see (10:32 a.m.) September 11, 2001). [Sammon, 2002, pp. 106-107; CBS News, 9/11/2002; 9/11 Commission, 7/24/2004, pp. 554]
Suspicious Plane Descending toward Air Force One – Tillman is now notified of the suspicious aircraft by the Jacksonville Center. He will later recall that the Jacksonville Center air traffic controller says there is “an aircraft coming at us, descending… and… its transponder was not on, and they had no idea who it was. It could have been another hijacked airliner. They weren’t sure.” The controller tells Tillman the aircraft is “behind you 10 miles, descending at least, flight level 3-5-0, looks to be holding there.” He adds: “Apparently we’ve lost radio contact with them. Are you aware of them?” Tillman replies, “Affirmative.” [Peter Schnall, 1/25/2009] The FAA reports this suspicious aircraft over the Pentagon’s air threat conference call at 10:39 a.m., saying the Jacksonville Center “is not working the aircraft. He’s not under [air traffic control] control.” [US Department of Defense, 9/11/2001 ] Major Robert Darling of the White House Military Office, who is in the Presidential Emergency Operations Center (PEOC) below the White House, will later recall that around this time, those in the PEOC receive word “of an unaccounted-for airliner last seen in the Atlanta, Georgia, area headed southeast toward Florida.” It is unclear if this is the aircraft that Tillman is warned about. [Darling, 2010, pp. 61]
Pilot Tells Others on Air Force One of Suspect Plane – Tillman informs others onboard Air Force One of the suspicious plane. Mark Rosenker, the director of the White House Military Office, will recall that Tillman “indicated to us that something was coming at us, it was not squawking [i.e. its transponder was off], it was not turning, and we had a feeling that we were going to be able to get away from it. But for a moment you ask the question, ‘What could it be?’” A CBS interviewer will point out to Rosenker that since this “unidentified aircraft… had its transponder off and wasn’t communicating,” it is apparently following “the MO [modus operandi] of all the other aircraft that attacked that day,” and suggest, “That must have made everybody a little nervous.” Rosenker will reply, “Well, it did.” However, he will add, “[W]e are clearly on probably the finest airplane in the world, so we were comforted by knowing that we had the ability to out-run and out-climb anything that was going to get near us.” [White House, 8/29/2002]
Air Force One Heads toward Gulf of Mexico for Safety – Tillman turns Air Force One and heads out to the Gulf of Mexico. He will recall: “We weren’t sure who was hijacked and who wasn’t, so I went out into the Gulf of Mexico. There’s basically fighters all over the Gulf that have the capability to make sure that no one comes into the Gulf, penetrates the United States. So I knew I’d be safe out into the Gulf of Mexico.” He will say he heads to the Gulf “to regroup and figure out where we could bring the president to keep him safe.”
Suspicious Plane a False Alarm – The concern about the suspicious aircraft turns out to be a false alarm. According to Tillman, “In reality, just his transponder was off [and] he hadn’t checked in with the controller right afterwards.” [CBS News, 1/17/2009; Peter Schnall, 1/25/2009]