All the alleged 9/11 hijackers reportedly check in at the airports from where they board Flights 11, 175, 77, and 93. [9/11 Commission, 7/24/2004, pp. 1-4; 9/11 Commission, 8/26/2004, pp. 27, 89, 93] Since 1998, the FAA has required air carriers to implement a program called the Computer Assisted Passenger Prescreening System (CAPPS). This identifies those passengers who might be a security risk, based upon suspicious behavior such as buying one-way tickets or paying with cash. CAPPS also randomly assigns some passengers to receive additional security scrutiny. If a particular passenger has been designated as a “selectee,” this information is transmitted to the airport’s check-in counter, where a code is printed on their boarding pass. At the airport’s security checkpoints, selectees are subjected to additional security measures. [US News and World Report, 4/1/2002; 9/11 Commission, 1/27/2004; US Congress, 3/17/2004; 9/11 Commission, 8/26/2004, pp. 2, 85] Their baggage is to be screened for explosives or held off the plane until they have boarded. Supposedly, the thinking behind this is that someone smuggling a bomb onto a plane won’t get onto that same flight. According to the 9/11 Commission, nine of the 19 hijackers are flagged by the CAPPS system before boarding Flights 11, 175, 77, and 93. [Washington Post, 1/28/2004; 9/11 Commission, 7/24/2004, pp. 84; United States of America v. Zacarias Moussaoui, a/k/a Shaqil, a/k/a Abu Khalid al Sahrawi, Defendant, 3/6/2006] In addition, Mohamed Atta was selected when he checked in at the airport in Portland, for his earlier connecting flight to Boston (see 5:33 a.m.-5:40 a.m. September 11, 2001). All of the hijackers subsequently pass through security checkpoints before boarding their flights. [9/11 Commission, 7/24/2004, pp. 1-4]
6:45 a.m. September 11, 2001: 9/11 Hijacker Jarrah Makes Final Phone Call to Girlfriend in Germany
Hijacker Ziad Jarrah phones his girlfriend, Aysel Senguen, about an hour before he boards Flight 93, according to the Los Angeles Times. Senguen is currently recovering from a minor operation in a hospital in Germany, where she lives. [Los Angeles Times, 10/23/2001; Observer, 8/22/2004] Senguen will later recount: “[H]e was very brief. He said he loved me three times. I asked what was up. He hung up shortly afterwards.… It was so short and rather strange him saying that repeatedly.” [Reuters, 11/19/2002; Guardian, 11/20/2002] Some accounts will say Jarrah makes this call from his hotel, the Days Inn in Newark. Other accounts will claim he makes it from a payphone at Newark Airport, although he does not actually check in at the airport until later on, at 7:39 a.m. [PBS, 1/17/2002; 9/11 Commission, 7/24/2004, pp. 532; Observer, 8/22/2004; Sunday Herald (Glasgow), 8/22/2004; 9/11 Commission, 8/26/2004, pp. 35]
7:00 a.m.-7:45 a.m. September 11, 2001: Computer Screening Program Selects Some 9/11 Hijackers; Fails to Stop Them
Sometime during this period, the 9/11 hijackers pass through airport security checkpoints at the various airports. The FAA has a screening program in place called the Computer Assisted Passenger Prescreening System (CAPPS). CAPPS automatically targets passengers for additional screening based on suspicious behavior such as buying one-way tickets or paying with cash. If a passenger is selected, their bags are thoroughly screened for explosives, but their bodies are not searched. [Washington Post, 1/28/2004] CAPPS selects three of the five Flight 11 hijackers. Since Waleed Alshehri checked no bags, his selection had no consequences. Wail Alshehri and Satam Al Suqami have their bags scanned for explosives, but are not stopped. No Flight 175 hijackers are selected. Only Ahmed Alhaznawi is selected from Flight 93. His bag is screened for explosives, but he is not stopped. The 9/11 Commission later concludes that Alhaznawi and Ahmed Alnami, also headed to Flight 93, have suspicious indicators and that they could have been linked to al-Qaeda upon inspection, but it has not been explained why or how. [9/11 Commission, 1/27/2004; Baltimore Sun, 1/27/2004] Screening of the Flight 77 hijackers is described below.
7:03 a.m.-7:48 a.m. September 11, 2001: Flight 93 Hijackers Check in at Airport and Board Plane; Only One Selected for Additional Screening
According to the 9/11 Commission, between 7:03 a.m. and 7:39 a.m. the four alleged Flight 93 hijackers check in at the United Airlines ticket counter at Newark (New Jersey) Liberty International Airport. Only Ahmad Alhaznawi is selected for additional scrutiny by airport security under the FAA’s CAPPS program (see (6:20 a.m.-7:48 a.m.) September 11, 2001). The only consequence is that his checked bag is screened for explosives, and not loaded onto the plane until it is confirmed that he has boarded. [9/11 Commission, 1/27/2004; 9/11 Commission, 7/24/2004, pp. 4; 9/11 Commission, 8/26/2004, pp. 35] On their way to boarding the plane, all four would pass through a security checkpoint, which has three walk-through metal detectors, two X-ray machines, and explosive trace detection equipment. [9/11 Commission, 8/26/2004, pp. 97] The 9/11 Commission later claims Newark Airport has no video cameras monitoring its security checkpoints, so there is no documentary evidence showing when the hijackers passed through the checkpoint or what alarms may have been triggered. [9/11 Commission, 7/24/2004, pp. 4; 9/11 Commission, 8/26/2004, pp. 35] However, Michael Taylor, the president of a security company, who has done consulting work for the New York Port Authority (which operates the airport), claims that Newark does use security cameras at the time of 9/11. [Boston Herald, 9/29/2001] All of the screeners on duty at the checkpoint are subsequently interviewed, and none report anything unusual or suspicious having occurred. [9/11 Commission, 7/24/2004, pp. 4; 9/11 Commission, 8/26/2004, pp. 35] The 9/11 Commission later concludes that the passports of Ahmad Alhaznawi and fellow Flight 93 hijacker Ahmed Alnami have suspicious indicators and could have been linked to al-Qaeda, but it does not elaborate on this. [Baltimore Sun, 1/27/2004]
Shortly Before 8:00 a.m. September 11, 2001: Two Passengers Allegedly Get Off Flight 93 Just Before Take-off
Two passengers leave Flight 93 after hearing an announcement that there will be a five-minute delay in the plane pushing back from the gate. This is according to Terry Tyksinski, a longtime flight attendant with United Airlines, who says a customer service supervisor who witnessed the incident told her about it six months after 9/11. The two first-class passengers are reportedly of dark complexion, “kind of black, not black.” According to Tyksinski, the supervisor notes their names and is subsequently twice interviewed by the FBI. [Longman, 2002, pp. xiii-xiv] No other accounts, including the 9/11 Commission Report, mention this incident. [9/11 Commission, 7/24/2004] And while Flight 93 is delayed on the ground until 8:42 a.m., reports state that it pushes back from the gate just one minute later than its scheduled departure, rather than there being a five-minute delay as Tyksinski suggests. [Boston Globe, 11/23/2001; MSNBC, 9/11/2006] There will only be 37 passengers on Flight 93, including the four hijackers. This is 20 percent of the plane’s passenger capacity of 182 and, according to the 9/11 Commission, “is considerably below the 52 percent average load factor for Flight 93 for Tuesdays in the three-month period prior to September 11.” [9/11 Commission, 8/26/2004, pp. 36]
8:01 a.m. September 11, 2001: Flight 93 Is Delayed for 41 Minutes; Cause Uncertain
Flight 93 is delayed for 41 minutes on the runway at Newark Airport, New Jersey. It will take off at 8:42 a.m. [Newsweek, 9/22/2001; Pittsburgh Post-Gazette, 10/28/2001; Boston Globe, 11/23/2001] Apparently, it has to wait in a line of about a dozen planes before it can take off. [USA Today, 8/11/2002] According to the Pittsburgh Post-Gazette, the delay is partly due to a fire at the airport the previous afternoon that had led to the runways being closed for 34 minutes. [CNN, 9/10/2001; Bergen Record, 9/11/2001; Pittsburgh Post-Gazette, 10/28/2001] But the 9/11 Commission says it is “because of the airport’s typically heavy morning traffic.” [9/11 Commission, 7/24/2004, pp. 10] And the Boston Globe later reports that United Airlines “will not explain why” Flight 93 was delayed on the runway. [Boston Globe, 11/23/2001] NBC News comments, “That delay would give passengers on Flight 93 the time to realize that this was a suicide mission and the chance to thwart it.” [MSNBC, 9/11/2006] CNN adds that it therefore “likely saved the White House or the US Capitol from destruction.” [CNN, 9/11/2006]
8:13 a.m.-9:28 a.m. September 11, 2001: Pilots of All Four Hijacked Planes Fail to Dial Standard Distress Code
In the event of a hijacking, all airline pilots are trained to key an emergency four-digit code into their plane’s transponder. This would surreptitiously alert air traffic controllers, causing the letters “HJCK” to appear on their screens. [CNN, 9/13/2001; Newsday, 9/13/2001; News (Portugal), 8/3/2002; 9/11 Commission, 7/24/2004, pp. 17-18] The action, which pilots should take the moment a hijack situation is known, only takes seconds to perform. [Christian Science Monitor, 9/12/2001; CNN, 9/12/2001] Yet during the hijackings of flights 11, 175, 77, and 93, none of the pilots do this. [CNN, 9/11/2001]
8:30 a.m.-10:00 a.m. September 11, 2001: NASA Plane Flying Routine Mission over New York State; Passes Flight 93
A special aircraft operated by NASA is in the air over western New York State at the time of the terrorist attacks and, at one point, a large aircraft, which those on board later learn is the hijacked Flight 93, flies less than 1,000 feet below it. [Space Center Roundup, 9/2002 
] The plane, NASA 931, is a modified KC-135—a four-engine military aircraft similar to the Boeing 707. [National Aeronautics and Space Administration, 10/2000, pp. 28; National Aeronautics and Space Administration, 10/29/2004] It is used by NASA for reduced gravity research, and is known as the “Weightless Wonder” or sometimes the “Vomit Comet.” The aircraft creates weightless conditions for brief periods by flying up and down in large parabolic arcs. [NASAexplores, 1/30/2003] It is regularly operated from NASA’s Glenn Research Center in Cleveland, Ohio, next to Cleveland Hopkins International Airport, and usually flies four days a week. [National Aeronautics and Space Administration, 10/2000, pp. 140; National Journal’s Technology Daily, 11/27/2002; National Aeronautics and Space Administration, 10/29/2004] A typical flight lasts two to three hours and consists of the plane flying 40 to 60 parabolas. [NASAexplores, 1/30/2003]
Scientists from Houston Conducting Microgravity Experiments – A team of scientists from NASA’s Johnson Space Center in Houston, Texas, has flown to Cleveland to conduct microgravity experiments on the KC-135. [Cleveland Free Times, 9/6/2006] Dominic Del Rosso, the test director on the plane, will later recall that the team is flying over western New York State when the terrorist attacks occur. During the routine mission, the KC-135 cruises back and forth along the New York shore of Lake Ontario, climbing and descending to create a freefall condition to simulate microgravity. Del Rosso will comment, “To think that this type of maneuver might ever seem threatening never crossed my mind until [September 11].” The plane’s crew members are notified at some point that a large plane is intersecting their flight path less than 1,000 feet below them, instead of the usual 2,000-foot minimum distance. They will later learn that this aircraft is the hijacked Flight 93, which crashes in Pennsylvania (see (10:06 a.m.) September 11, 2001). Del Rosso will recall, “After the unwanted flyby, we landed having no idea why or what was going on.” [Space Center Roundup, 9/2002 ] The scientists are unable to return to Houston on this day, as scheduled, after the FAA orders all planes to land (see (9:45 a.m.) September 11, 2001), and so have to be put up in a hotel in Cleveland. [Cleveland Free Times, 9/6/2006]
8:42 a.m. September 11, 2001: Flight 93 Takes Off 41 Minutes Late
Flight 93 takes off from Newark International Airport, bound for San Francisco, California. It leaves 41 minutes late because of heavy runway traffic (see 8:01 a.m. September 11, 2001). [Newsweek, 9/22/2001; Pittsburgh Post-Gazette, 10/28/2001; Associated Press, 8/21/2002; MSNBC, 9/3/2002; 9/11 Commission, 6/17/2004 ]
8:45 a.m. September 11, 2001: Air Traffic Control Centers Receive False Bomb Threats
CNN will report that, while Flight 11 is heading toward the World Trade Center, “[S]ources say there were bomb threats called in to air traffic control centers adding to the chaos.” One center receiving such threats is the FAA’s Boston Center, which handles air traffic over New England and monitors flights 11 and 175. The FAA’s Cleveland Center, which will monitor Flight 93, receives similar threats (see 10:07 a.m.-10:21 a.m. September 11, 2001). Whether other centers are threatened is unstated. According to Newsweek, “Officials suspect that the bomb threats were intended to add to the chaos, distracting controllers from tracking the hijacked planes.” [Newsweek, 9/22/2001; CNN, 9/30/2001] Yet, just weeks after 9/11, the Washington Post will claim: “Federal aviation officials no longer believe that accomplices of the hijackers made phony bomb threats to confuse air traffic controllers on September 11. Sources said reports of multiple threats were apparently the result of confusion during the early hours of the investigation and miscommunication in the Federal Aviation Administration.” [Washington Post, 9/27/2001]
