Air travel security was fundamentally transformed following the 9/11 terrorist attacks, leading to the creation of the Transportation Security Administration (TSA) in November 2001. This federal agency took over airport security screening, implementing stricter measures such as scanning liquids, body scans, and limiting access past checkpoints to ticketed passengers only. Additionally, cockpit doors were reinforced to be bulletproof, and pilots and flight attendants received enhanced training for security threats.
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