Security changes after 9/11

    The fact that 9/11 was possible relates directly to the lack of security in the US. After 9/11 the US realized how much of a threat terrorist could be and how they needed to increase security to prevent future attacks.

Air Travel
    Obviously, security in airports prior to 9/11 was terrible so within two weeks of 9/11 stricter security policies were set in motion. For example, before 9/11 5% of bags were screened, but after 9/11 100% of bags are screened. The Aviation and Transportation Security Act was passed and set up many of the policies that are still in place today, like removing shoes and banning liquids. In addition, fortified cockpits, first-class cabin curtains, and federal flight deck officers allowed to carry a firearm were introduced. As a result of the expensive changes being applied to airplanes and airports, a "Sept. 11 fee" was introduced to passengers tickets, $15 extra per ticket. Over nine years, TSA collected nearly $15 billion.

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Government
    The most famous and important act, the Patriot Act, was introduced after 9/11 to improve US abilities to detect and deter terrorism. The Enhanced Border Security and Visa Entry Reform Act made it so that the State Department and Immigration had to share visa and immigration information with each other. In addition, the US doubled its defense spending by 2011 to reach a total of $708 billion.

Architecture
    The International Code Council released new and improve building plans for skyscrapers to be able to withstand similar attacks. Changes included elevators usable in emergencies, blast protection, protected ventilation, tougher windows, stairwell improvements, and higher fire-resistant and impact-resist walls for elevators shafts and exit stairwells.

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