Which agency is responsible for regulating the operations of Republic Airways?

The Federal Aviation Administration (FAA) is the correct choice because it is the primary agency responsible for overseeing and regulating all aspects of civil aviation in the United States. This includes ensuring the safety of commercial airlines, like Republic Airways, which operates under FAA regulations. The FAA sets the standards for airline operations, maintenance, pilot training, and air traffic control, ensuring that airlines comply with federal aviation laws and safety protocols.

While other agencies play important roles in aviation-related matters, the TSA focuses on security measures at airports, the NTSB investigates aviation accidents to improve safety, and the FCC deals mainly with communications regulations. However, the fundamental regulatory authority for airline operations is distinctly under the purview of the FAA.