Airport security repercussions due to the September 11, 2001 attacks
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Box-cutter knives were apparently used in the September 11, 2001 attacks, though such knives are not usually considered weapons. The hijackers could have very easily gotten these type of knives past airport security since up until the attacks, they fit the qualifications to be permitted on U.S. domestic flights: any knife with a blade up to 4 inches long was permitted. FAA rules placed into effect on September 13 2001 prohibit any type of knife in secured airport areas and planes.
Airport security for the two flights out of Newark and Washington Dulles had been provided by Argenbright Holdings Ltd, a company which had pleaded guilty to federal fraud charges in May 2000 because they had hired 1,300 untrained security guards, including several dozens with criminal records, at Philadelphia International Airport.<ref>Paul Zielbauer with John Sullivan, "AFTER THE ATTACKS: AIRPORT SECURITY; F.A.A. Announces Stricter Rules; Knives No Longer Allowed", The New York Times, National Desk Late Edition - Final, Section A, Page 5, Column 1, 2001-09-13, Archived links: [1] and [2] </ref> The company, which was on probation at the time of the attack, had its probation extended to October 2005.<ref>"Feds: Airport security firm to admit violation", CNN, 2001-10-21</ref><ref>Eric Grasser and David Evans, "Legal case against Argenbright opens a window into systemic shortcomings", Aviation Today</ref>
Many security experts and libertarians have criticised new airport security policies. Bruce Schneier believes that the attackers were successful not because of any particular security screening failure, but because using box cutters to hijack planes and then flying them into buildings had simply never been seriously considered before as an attack vector. A similar attack attempted today would surely meet with more resistance, as passengers are now fully aware of the potential.
Another common criticism is that any terrorist prevented from carrying a knife onto an airplane could easily improvise a weapon by, for example, smashing a glass bottle - or just attack with his or her bare hands.
Evidence of this can be seen in the events of September 11, 2001 itself, as the passengers on the fourth plane resisted the hijackers once their friends and family called in to report what had happened with the previous three planes. The only difference between this plane and the others was public awareness. Before 9/11, curtains were used to partition the first class cabin from the main cabin. Since the hijackers were all in first class, the main cabin was mostly unaware of what was going on until it was too late. Since, most airlines have eliminated the curtains as they pose a grave security risk and had little other purpose than to symbolically divide the cabins.
John Gilmore sued United Airlines, Southwest Airlines and U.S. Attorney General John Ashcroft arguing that requiring passengers to show identification before boarding flights is tantamount to an internal passport, and is unconstitutional.<ref>Julia Scheeres, "Judge to Hear Air ID Challenge", Wired News, 2003-01-18</ref><ref>Ryan Singel, "Flight ID Fight Revived", Wired News, 2004-08-16</ref> It may be noted that not all 19 of the September 11th hijackers had valid identification, yet all were able to board.
