Which institution conducts regular audits of airport security practices?

The Transportation Security Administration (TSA) is the correct answer because it plays a critical role in overseeing and implementing security measures at U.S. airports. The TSA was established to enhance the security of the nation's transportation systems, particularly following the events of September 11, 2001. Regular audits of airport security practices are an integral part of their responsibilities to ensure compliance with federal security standards. This includes evaluating the effectiveness of security protocols, conducting inspections, and providing training to airport personnel.

While other organizations also contribute to the security landscape, such as the Federal Aviation Administration (FAA), which focuses more on the safety and regulation of the aviation industry, or the International Air Transport Association (IATA), which primarily advocates for airline interests and safety standards internationally, they do not conduct the regular audits of airport security practices that the TSA is tasked with. The Airport Security Council (ASC) may be involved in discussions or advisory roles, but it lacks the regulatory authority and extensive oversight capabilities of the TSA.