Which of the following best describes a key function of the FBI in aviation security?

The FBI plays a crucial role in aviation security, primarily as an investigative agency. Its key function related to aviation security is to investigate aviation-related criminal activity. This includes addressing threats such as terrorism, air piracy, smuggling, and any other crimes that might pose risks to the safety of flights and airports. The FBI works in coordination with other federal, state, and local agencies to ensure that aviation security measures are effective and that any potential criminal activity is promptly addressed.

The agency's focus on investigation allows it to gather intelligence, prevent incidents, and bring perpetrators to justice, ultimately contributing to a safer aviation environment. This investigative function is vital because it helps detect patterns or threats that could affect public safety in the aviation sector.

Other choices involve roles that do not align with the primary responsibilities of the FBI. For example, providing routine flight assistance, managing airport operations, and conducting passenger screenings typically fall under the purview of aviation authorities, airport management, and specific transportation security agencies rather than the FBI's investigative focus.