Twenty-five years after the September 11, 2001 terrorist attacks, aviation security has been completely overhauled, changing the way people fly. The Transportation Security Administration was established in November 2001, replacing private screening checkpoints and introducing new airport routines such as emptying water bottles and body scans. Aircraft were also hardened with bulletproof cockpit doors and stricter cockpit access protocols, while pilots and flight attendants received additional training to handle terrorists. The attacks, carried out by Al Qaeda hijackers, led to only ticketed flyers being allowed past security checkpoints.
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