What agency governs all US carriers with rules and regulations?

The Federal Aviation Administration (FAA) is the agency that governs all U.S. carriers by establishing rules and regulations governing aviation safety and air travel. The FAA is responsible for regulating civil aviation to promote safety and efficiency across the national airspace system. This includes setting standards for aircraft operations, pilot licensing, maintenance procedures, and overseeing air traffic control.

The FAA's regulations apply to airlines, commercial operators, and private pilots, ensuring that all operational aspects of aviation meet stringent safety criteria. Its authority extends to the enforcement of safety compliance, making it the primary governing body that oversees the operational integrity of U.S. carriers.

The other organizations mentioned, such as IATA (International Air Transport Association) and ICAO (International Civil Aviation Organization), primarily focus on international standards and cooperation rather than direct governance of U.S. carriers. The DOT (Department of Transportation) plays a role in the regulation of transport systems, including aviation, but the FAA specifically focuses on air safety and operational regulations.