What is the main function of the Federal Aviation Administration (FAA)?

The main function of the Federal Aviation Administration (FAA) is to oversee civilian aviation aspects. This includes setting and enforcing regulations to ensure the safety of air travel, managing air traffic control, certifying pilots and aircraft, and ensuring that airports comply with national safety standards. The FAA plays a crucial role in maintaining the safety and efficiency of the United States' air transportation system, which is vital for both passenger travel and freight transport.

In contrast, while regulating environmental standards may be part of its broader responsibilities, it is not the primary focus. Conducting drug investigations is typically under the purview of law enforcement agencies rather than the FAA. Facilitating international trade, although important, does not specifically relate to the FAA’s core mission of managing civil aviation and ensuring flight safety.