Which agency has authority during security incidents occurring at airports or on aircraft within U.S. jurisdiction?

The agency with authority during security incidents occurring at airports or on aircraft within U.S. jurisdiction is the Transportation Security Administration (TSA). The TSA was created in response to the events of September 11, 2001, with the primary mission of ensuring the security of the nation’s transportation systems, which includes airports and airlines.

The TSA is responsible for implementing security measures, screening passengers and baggage, and establishing protocols to prevent and respond to potential threats at airports and on flights. Their personnel are trained to handle security incidents, assess risks, and coordinate responses with other security entities when necessary.

While other agencies, such as the FBI, have roles in law enforcement and responding to criminal activity, and the FAA oversees aviation safety and regulations, the TSA specifically focuses on transportation security. The Department of Homeland Security encompasses the TSA but is broader in scope, dealing with a wide range of issues beyond aviation security. Thus, the TSA's dedicated focus on airport and aircraft security incidents makes it the relevant authority in this context.