Which organization is responsible for managing and regulating air traffic in the United States?

The Federal Aviation Administration (FAA) is the organization responsible for managing and regulating air traffic in the United States. The FAA oversees all aspects of civil aviation, including air traffic control, airspace management, and the safety and efficiency of air travel. This encompasses establishing regulations that govern aviation operations and ensuring compliance among various stakeholders, including commercial airlines, pilots, and airports.

In contrast, other listed organizations have different primary responsibilities. NASA focuses on aeronautics research and space exploration rather than the regulation of air traffic. The Department of Transportation (DOT) is broader and oversees various modes of transportation, but it does not specifically handle air traffic management. The Transportation Security Administration (TSA) is primarily concerned with security in air travel, focusing on passenger and baggage screening, but it does not manage air traffic operations.