The creation of the Transportation Security Administration, or TSA, was a major response to the 9/11 terror attacks. This move is considered one of the largest government mobilizations since World War II. The 9/11 hijackers exploited weaknesses in airport security, leading to a complete overhaul of screening procedures and changes to air travel.

According to Brian Fonseca, the TSA was established to ensure the security and safety of passengers. The Department of Homeland Security was also created in response to the attacks. Further information on the transformation of airport security and the creation of the TSA is available from the source.