Which entity is primarily responsible for ensuring security at U.S. airports?

The Transportation Security Administration (TSA) is the agency primarily responsible for ensuring security at U.S. airports. Established in response to the September 11, 2001, terrorist attacks, the TSA focuses on safeguarding the nation's transportation systems, with a strong emphasis on airport security. Its responsibilities include implementing security measures for passengers, baggage screening, and overall airport operations to prevent unlawful interference with civil aviation.

The TSA carries out various security protocols, including passenger screening at checkpoints, enforcing regulations on prohibited items, and coordinating security activities with airlines and airport authorities. This specific focus on airport security, along with its authority to enforce security policies, clearly delineates the TSA's role in the aviation security framework of the United States.