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]
7:15 a.m. September 11, 2001: Flight 77 Hijackers Almihdhar and Moqed Check in at Dulles Airport
Khalid Almihdhar and Majed Moqed, two of the men who will allegedly hijack Flight 77, check in at the American Airlines ticket counter at Washington’s Dulles International Airport. [9/11 Commission, 7/24/2004, pp. 2-3; 9/11 Commission, 8/26/2004, pp. 27] They are recorded by one of the airport’s security cameras approaching the ticket counter, with Moqed pulling a large, dark, roller-type suitcase and Almihdhar pulling a smaller, dark, roller-type suitcase. [Federal Bureau of Investigation, 9/19/2001] They are checked in by a female ticketing agent for American Airlines whose name is unstated. The ticketing agent will later recall Moqed giving her a small, old, leather suitcase to check in. Almihdhar, meanwhile, has a carry-on bag with him, she will say in one interview with the FBI. However, a week later she will tell the FBI he had no bags with him.
One Hijacker Seems Unable to Understand the Agent’s Questions – Almihdhar and Moqed appear to be in a very good mood and are polite as they are checked in. They provide Virginia identification. One of them seems to be in charge and answers all of the ticketing agent’s questions. He hesitates, though, before responding to the question, “Has anyone given you anything to carry on the flight?” The other man appears unable to understand the security questions he is asked. [Federal Bureau of Investigation, 9/12/2001; Federal Bureau of Investigation, 9/19/2001] After being checked in, the two men proceed to a security screening checkpoint (see 7:18 a.m. September 11, 2001). [9/11 Commission, 8/26/2004, pp. 27] Almihdhar is pulling along his suitcase but Moqed does not have his suitcase with him at this point. [Federal Bureau of Investigation, 9/19/2001] As they leave the ticket counter, they wave and smile at the ticketing agent. [Federal Bureau of Investigation, 9/19/2001]
Hijackers Are Flagged by a Computerized Prescreening System – Almihdhar and Moqed are both flagged by CAPPS (the Computer Assisted Passenger Prescreening System) when they check in. [9/11 Commission, 7/24/2004, pp. 3] CAPPS is an FAA-approved automated system administered by commercial airlines that aims to identify passengers whose profile suggests they may pose more than a minimal risk to aircraft. Passengers selected by CAPPS have their baggage screened for explosives or held off the plane until they have boarded. [9/11 Commission, 7/24/2004, pp. 84; Trento and Trento, 2006, pp. 12] Almihdar’s name was recently added to a terrorism watch list (see August 23, 2001). [Associated Press, 7/22/2004; 9/11 Commission, 7/24/2004, pp. 270] Almihdhar was recorded on video in a terminal at Dulles Airport at some time the previous evening, possibly accompanied by Salem Alhazmi, another one of the alleged Flight 77 hijackers (see September 10, 2001). [9/11 Commission, 9/29/2003 
; Federal Bureau of Investigation, 11/14/2003 ]
7:15 a.m.-7:36 a.m. September 11, 2001: Flight 77 Hijackers Are Recorded on Video at Dulles Airport
Security cameras at Washington’s Dulles International Airport capture the alleged hijackers of Flight 77 checking in at the airport and passing through a security screening checkpoint. [Federal Bureau of Investigation, 9/19/2001; 9/11 Commission, 4/6/2004 ] A surveillance camera located above the British Airways ticket counter points toward the American Airlines ticket counter, and therefore records alleged hijackers Nawaf Alhazmi and Salem Alhazmi when they check in at the airport (see 7:29 a.m. September 11, 2001). [Federal Bureau of Investigation, 9/25/2001] Another surveillance camera located by the British Airways ticket counter also points toward the American Airlines ticket counter, and records alleged hijackers Khalid Almihdhar and Majed Moqed when they check in (see 7:15 a.m. September 11, 2001). [Federal Bureau of Investigation, 9/19/2001; Federal Bureau of Investigation, 9/19/2001] All five of the alleged hijackers of Flight 77 are recorded on video as they go through a security checkpoint at the airport (see 7:18 a.m. September 11, 2001, (Shortly Before 7:35 a.m.) September 11, 2001, and 7:36 a.m. September 11, 2001). [9/11 Commission, 7/24/2004, pp. 3; 9/11 Commission, 8/26/2004, pp. 27] Dulles Airport is the only one of the three airports used by the hijackers this morning that has videotaping equipment in use at its security checkpoints. Consequently, William Johnstone, a member of the 9/11 Commission staff, will later note, “the most specific information that exists about the processing of the 9/11 hijackers is information about American Airlines Flight 77,” which will take off from Dulles Airport this morning (see (8:20 a.m.) September 11, 2001). [9/11 Commission, 1/27/2004] In 2004, news organizations will receive a copy of a surveillance video apparently showing the alleged hijackers passing through a security checkpoint at Dulles Airport before boarding Flight 77. The Associated Press will describe the video as “grainy” and report that details are “difficult to distinguish.” It will note that “[n]o knives or other sharp objects are visible” on the video. [Associated Press, 7/22/2004]
7:18 a.m. September 11, 2001: Flight 77 Hijackers Almihdhar and Moqed Set Off Alarms as They Go through a Security Checkpoint at Dulles Airport
Khalid Almihdhar and Majed Moqed, two of the men who will allegedly hijack Flight 77, go through a security screening checkpoint at Washington’s Dulles International Airport. They are screened at the west checkpoint in the airport’s main terminal. Screening passengers is the responsibility of United Airlines, but it contracts the work to Argenbright Security.
Hijackers Set Off the Metal Detector Alarms – After entering the checkpoint, Almihdhar and Moqed place their carry-on bags on the X-ray machine belt and then pass through the first walk-through metal detector. Both men set off the alarm. They are therefore directed to go through a second metal detector. Almihdhar passes through this without any problems but Moqed again sets off the alarm. This leads to him being screened by a security officer with a handheld metal detector wand. No problems are found and so he is allowed to proceed on his way. None of the men’s carry-on bags are inspected by checkpoint personnel. As Moqed is leaving the checkpoint area, he appears to intentionally look down at the floor as he passes a security camera, thereby preventing the camera from capturing a close-up of his face. The other three Flight 77 hijackers will go through the west checkpoint 17 or 18 minutes later (see (Shortly Before 7:35 a.m.) September 11, 2001 and 7:36 a.m. September 11, 2001). [Federal Bureau of Investigation, 9/19/2001; 9/11 Commission, 7/24/2004, pp. 3; 9/11 Commission, 8/26/2004, pp. 27]
Screeners Will Recall No Suspicious Activity – Immediately after today’s terrorist attacks, the FAA’s Washington Civil Aviation Security Field Office will investigate the security screening at Dulles Airport. It will interview 43 of the 44 screeners who were on duty today, and these employees will all report having encountered no suspicious activity and nothing out of the ordinary this morning. [9/11 Commission, 7/24/2004, pp. 3; 9/11 Commission, 8/26/2004, pp. 93] However, lawyer Ron Motley, whose firm will represent some families of victims of today’s attacks, will later criticize the screeners at Dulles Airport, commenting, “Even after setting off these alarms, the airlines and security screeners failed to examine the hijackers’ baggage, as required by federal regulations and industry-mandated standards, or discover the weapons [the hijackers] would use in their attack.” [Associated Press, 7/22/2004]
7:29 a.m. September 11, 2001: Flight 77 Hijackers Nawaf and Salem Alhazmi Check in at Dulles Airport
Brothers Nawaf Alhazmi and Salem Alhazmi, two of the men who will allegedly hijack Flight 77, check in at the American Airlines ticket counter at Washington’s Dulles International Airport. [9/11 Commission, 7/24/2004, pp. 3, 452; 9/11 Commission, 8/26/2004, pp. 27] They are running late. They “come running in the front door, looking around, and didn’t know which way to go,” Vaughn Allex, an employee at the ticket counter, will later describe. [CNN, 9/8/2012; ABC 7, 9/10/2016] They are captured on security video pulling large, dark, roller-type suitcases as they approach the counter. [Federal Bureau of Investigation, 9/19/2001] They are allowed to check in despite having missed the official deadline for doing so by a few minutes. [CNN, 9/8/2012; ABC 7, 9/10/2016]
Trainee Checks in the Hijackers – Nawaf and Salem Alhazmi are checked in by Inga Hill, a trainee who is overseen by Allex. [Federal Bureau of Investigation, 9/19/2001; Federal Bureau of Investigation, 9/25/2001] Today is only her second day working at Dulles Airport. [Federal Bureau of Investigation, 9/12/2001] Allex looks on while she confirms the brothers’ tickets. [Federal Bureau of Investigation, 9/25/2001] The Alhazmis check in two dark-colored bags, one of them a hard plastic suitcase, the other a soft bag, Hill will recall. One of the brothers has a carry-on bag, she will say. [Federal Bureau of Investigation, 9/12/2001] Allex will recall the brothers having only one bag, which he considers to be “totally inappropriate for a trip to Los Angeles.” The bag is “almost like a satchel” with straps across the top but which doesn’t seal, he will say. [CNN, 9/8/2012]
Hijackers Have Difficulty Answering Questions – Nawaf and Salem Alhazmi show passports for their photo identification but are unable to recall the country from which these were issued. They also have trouble answering the security questions that all passengers must answer. Allex therefore has to get involved and take over the task of questioning them, Hill will recall. [Federal Bureau of Investigation, 9/12/2001] However, Allex will say he takes on the task of checking them in from the outset because they are running late. [CNN, 9/8/2012] Nawaf Alhazmi is the only one of the brothers who speaks during the check-in, but his English is poor. Salem Alhazmi, meanwhile, acts “very anxious or excited,” according to Allex. [Federal Bureau of Investigation, 9/12/2001; Federal Bureau of Investigation, 9/25/2001] “He was grinning, he was smiling, and he was dancing back and forth,” Allex will say. [CNN, 9/8/2012]
Hijackers Are Selected for Extra Scrutiny – Allex selects the two brothers for extra security scrutiny. He does this because he finds them suspicious, and one of them—probably Salem Alhazmi, according to the 9/11 Commission—has no photo identification and cannot understand English. However, the only consequence of the extra scrutiny will be that their bags are held off Flight 77 until it is confirmed that they have boarded it.
Employee Is Suspicious and Follows the Hijackers – After being checked in, Nawaf and Salem Alhazmi proceed to a security screening checkpoint (see 7:36 a.m. September 11, 2001). [9/11 Commission, 7/24/2004, pp. 3; 9/11 Commission, 8/26/2004, pp. 27-28; USA Today, 9/12/2016] They no longer have their suitcases with them when they leave the ticket counter. [Federal Bureau of Investigation, 9/19/2001] Allex is still uncomfortable with the two men and follows them for a few steps. He stops himself, though, as he is concerned that his suspicion may be racially motivated. [CNN, 9/8/2012] The name of Nawaf Alhazmi was recently added to a terrorism watch list (see August 23, 2001). [Associated Press, 7/22/2004; 9/11 Commission, 7/24/2004, pp. 270] An employee at Dulles Airport will recall encountering him and four other Middle Eastern men as they tried to get to a secure area of the airport the previous evening (see (Between 8:00 p.m. and 8:45 p.m.) September 10, 2001). [9/11 Commission, 1/19/2004 ; Trento and Trento, 2006, pp. 2-6, 43-44]
Shortly Before 7:35 a.m. September 11, 2001: Flight 77 Hijacker Hanjour Checks in at Dulles Airport
Hani Hanjour, one of the men who will allegedly hijack Flight 77, checks in at the American Airlines ticket counter at Washington’s Dulles International Airport. He is flagged by CAPPS (the Computer Assisted Passenger Prescreening System). [9/11 Commission, 7/24/2004, pp. 3] CAPPS is an automated system created to identify passengers who should be subjected to special security measures. Passengers selected by it have their baggage screened for explosives or held off the plane until they have boarded. [9/11 Commission, 7/24/2004, pp. 1, 84; Trento and Trento, 2006, pp. 12] The exact time when Hanjour checks in at the ticket counter is unclear. American Airlines will be unable to find information about his check-in time when the 9/11 Commission requests it. However, the 9/11 Commission will conclude, the check-in “had to have taken place between 7:25 a.m., when he may have parked the rental car in the airport parking lot, and 7:35 a.m., when he appears on the checkpoint videotape” (see 7:35 a.m. September 11, 2001). [9/11 Commission, 8/26/2004, pp. 93]
7:35 a.m. September 11, 2001: Flight 77 Hijacker Hanjour Goes through a Security Checkpoint at Dulles Airport without Any Problems
Hani Hanjour, one of the men who will allegedly hijack Flight 77, passes through a security screening checkpoint at Washington’s Dulles International Airport without incident. He is screened at the west checkpoint in the airport’s main terminal. [9/11 Commission, 7/24/2004, pp. 3; 9/11 Commission, 8/26/2004, pp. 27] He has two carry-on bags with him: a small black suitcase and a black bag with a shoulder strap. [Federal Bureau of Investigation, 9/19/2001] After entering the checkpoint, he places them on the X-ray belt and walks through the metal detector. He sets off no alarms and so, after picking up his bags, proceeds on his way. [9/11 Commission, 7/24/2004, pp. 3; 9/11 Commission, 8/26/2004, pp. 27] His carry-on bags are not physically inspected at the checkpoint. [Federal Bureau of Investigation, 9/19/2001] Two of the other Flight 77 hijackers passed through the west checkpoint 17 minutes ago (see 7:18 a.m. September 11, 2001) and two more will go through it a minute later (see 7:36 a.m. September 11, 2001). [9/11 Commission, 7/24/2004, pp. 3; 9/11 Commission, 8/26/2004, pp. 27] The FAA’s Washington Civil Aviation Security Field Office will investigate the security screening at Dulles Airport today, and the screeners who were on duty will report having encountered no suspicious activity and nothing out of the ordinary this morning. [9/11 Commission, 7/24/2004, pp. 3; 9/11 Commission, 8/26/2004, pp. 93]
7:36 a.m. September 11, 2001: Flight 77 Hijackers Nawaf and Salem Alhazmi Go through a Security Checkpoint at Dulles Airport and One of Them Sets Off Alarms
Brothers Nawaf Alhazmi and Salem Alhazmi, two of the men who will allegedly hijack Flight 77, go through a security screening checkpoint at Washington’s Dulles International Airport. They are screened at the west checkpoint in the airport’s main terminal. Both men have one carry-on bag. After entering the checkpoint, Salem Alhazmi walks through a metal detector without setting off the alarm and so is allowed to continue on his way. However, Nawaf Alhazmi sets off the alarm when he passes through it and so he has to walk through a second metal detector. He again sets off the alarm. He is therefore hand-wanded by a member of staff and has his carry-on bag swiped by an explosive trace detector. These checks apparently find no problems and so he is allowed to proceed on his way. Salem Alhazmi’s bag is not physically inspected while the two men are at the checkpoint, nor are the contents of Nawaf Alhazmi’s bag. Security camera footage will later reveal that Nawaf Alhazmi has an unidentified item clipped to the rim of the back pocket of his pants. One of the other Flight 77 hijackers passed through the west checkpoint a minute ago (see 7:35 a.m. September 11, 2001) and two more passed through it 17 minutes before that (see 7:18 a.m. September 11, 2001). The FAA’s Washington Civil Aviation Security Field Office will investigate the security screening at Dulles Airport today and the screeners who were on duty will recall having encountered no suspicious activity and nothing out of the ordinary this morning. [Federal Bureau of Investigation, 9/19/2001; 9/11 Commission, 7/24/2004, pp. 3; 9/11 Commission, 8/26/2004, pp. 27-28]
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]
8:20 a.m. September 11, 2001: Flight 77 Takes Off 10 Minutes Late
Flight 77 departs Dulles International Airport near Washington, ten minutes after its 8:10 scheduled departure time. [Washington Post, 9/12/2001; CNN, 9/17/2001; Guardian, 10/17/2001; Associated Press, 8/21/2002; 9/11 Commission, 6/17/2004 ]
