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The checkpoint for flight 175 was controlled by American Airlines. However, it contracted with the Huntleigh USA to perform screening.

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The checkpoint for flight 175 was controlled by American Airlines. However, it contracted with the Huntleigh USA to perform screening.

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set of metal detector alarms but were still allowed on the plane.

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set of metal detector alarms but were still allowed on the plane.

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Mohamed Atta was selected by CAPPS, Computer Assisted Passenger Prescreening System, created to identity passengers who should be subject to special security measures 

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Mohamed Atta was selected by CAPPS, Computer Assisted Passenger Prescreening System, created to identity passengers who should be subject to special security measures 

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For three decades the airports have been focusing on guns and explosions rather than dangerous people

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For three decades the airports have been focusing on guns and explosions rather than dangerous people

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The security system was weak due to individual pieces of the overall program were uncoordinated. Meaning information in one sector was not communicated to the others. 

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The security system was weak due to individual pieces of the overall program were uncoordinated. Meaning information in one sector was not communicated to the others. 

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The X-ray machine that was made to screen the carry-on items, did not find anything that was dangerous.

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The X-ray machine that was made to screen the carry-on items, did not find anything that was dangerous.

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The hijackers were allowed to get on the plane because their past suggested that they would not complete a suicide mission. 

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The hijackers were allowed to get on the plane because their past suggested that they would not complete a suicide mission. 

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One of the Hazmi brothers did not have photo identification, and he did not understand English.

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One of the Hazmi brothers did not have photo identification, and he did not understand English.

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Made Moqed set the metal detector off, was wanded by a screen, and then he was allowed to pass the inspection.

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Made Moqed set the metal detector off, was wanded by a screen, and then he was allowed to pass the inspection.

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Door were only required to be locked during take off

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The mastermind behind the attacks on 9/11, Khalid Sheikh Mohammed, sent two terrorists to California because it was “a convenient point of entry from Asia” and was far away from the target (New York). These men were also able to easily obtain US visas

The two terrorists began taking flight lessons as soon as they learned English

American friends of the two terrorists noticed strange behavior between them, but didn’t say anything

Some people were told about the terrorists' extremist ideals but didn’t say anything

Signs of hostility and “craziness” were seen by some who had interactions with the terrorists

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Nawaf al Hazmi set the metal detectors off twice, and had an identified item in his back pocket. Yet, he still passed.

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Nawaf al Hazmi set the metal detectors off twice, and had an identified item in his back pocket. Yet, he still passed.

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"At almost every step along the way, the system posed no challenge to the terrorist"

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"At almost every step along the way, the system posed no challenge to the terrorist"

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"assuming they were followed to the letter--would have prevented the hijackers from carrying out their baleful missions"

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"assuming they were followed to the letter--would have prevented the hijackers from carrying out their baleful missions"

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major U.S. airports in 68% of their attempts in 1998 and 1999. They were able to board aircraft 117 times without going through security, often because airport and airline employees didn't close security doors behind them.

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Security lacked closed-circuit television surveillance. There is no documentary evidence to indicate when the hijackers passed through the checkpoint.

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Security lacked closed-circuit television surveillance. There is no documentary evidence to indicate when the hijackers passed through the checkpoint.

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in the 1970s deployed undercover agents on all "high-risk" international flights and many domestic routes. That would strengthen security not merely because the government might ensure that training standards and work rules are better enforced--which could be a faulty assumption--but because lines of authority and accountability will be much clearer.

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in the 1970s deployed undercover agents on all "high-risk" international flights and many domestic routes. That would strengthen security not merely because the government might ensure that training standards and work rules are better enforced--which could be a faulty assumption--but because lines of authority and accountability will be much clearer.

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The commission further recommended that the airlines and government be forbidden from maintaining permanent databases on so-called selectees--people selected by the CAPS system for closer scrutiny--and that the entire system should only remain in place until "explosive detection systems are reliable and fully deployed"--another sign of the naive, prevailing assumption before Sept. 11 that explosives, not people, represented the real threat.

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In 1996, Dan Issacharoff, a former security chief at El Al, told a National Research Council panel on airline security that, although El Al inspects all baggage, it also conducts face-to-face questioning of all passengers.

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In 1996, Dan Issacharoff, a former security chief at El Al, told a National Research Council panel on airline security that, although El Al inspects all baggage, it also conducts face-to-face questioning of all passengers.

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Crash site of Flight 93 FBI collected 14 knives. no evidence of firearm.

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Crash site of Flight 93 FBI collected 14 knives. no evidence of firearm.

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When the terrorists of Flight 175 were checking into their flight, the United ticket agent noticed they had trouble understanding the standard security questions…

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The company pleaded guilty last year to hiring more than 1,300 untrained screeners--including dozens of criminals whose backgrounds had not been checked--to work at Philadelphia International Airport from 1995 to 1998.

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Hani Hanjour, Khalid al Mihdhar, and Majed Moqed (terrorists of Flight 77) were flagged by CAPPS. The Hazmi brothers were selected for extra scrutiny because they were seemed to be suspicious and one of the brothers did not have photo identification nor could understand English. They all boarded the plane, only their bags were held off.

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Commercial aircraft design offered almost no protection from cockpit takeovers. Such attempts, in fact, have been growing more frequent in recent years

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Commercial aircraft design offered almost no protection from cockpit takeovers. Such attempts, in fact, have been growing more frequent in recent years

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the cockpit doors are only required to be locked during takoff so they were unlocked

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The easy availability of the key to the cockpit might explain how the cockpit was taken by surprise

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The easy availability of the key to the cockpit might explain how the cockpit was taken by surprise

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one of the hijackers had a "bomb" strapped to his chest but we still don't know if it was fake or not