The September 11, 2001 attacks profoundly transformed aviation security in the United States. Before these changes, security controls at North American airports were managed by private companies, which meant there was no unified standard of supervision nor rigorous federal regulations applied consistently.
There were significantly fewer restrictions on what could be carried on board airplanes, allowing passengers to bring a greater variety of objects without the current limitations. This lack of rigorous control represented a significant vulnerability in the aviation security system.
Additionally, family members and friends could accompany passengers to the boarding gates, which allowed more free access to restricted areas of airports. This practice was completely altered after the attacks, with the creation of more restrictive security zones.
These changes implemented after September 11th established a new paradigm in airport security, marking a break with previous practices and introducing control measures that became standard in the aviation industry worldwide.
