Which organization is responsible for controlling all aspects of aviation in the United States?

The Federal Aviation Administration (FAA) is the organization responsible for regulating and overseeing all aspects of civil aviation in the United States. This includes setting safety regulations, managing air traffic control, and ensuring the protection of the national airspace. The FAA's mission is to promote safe and efficient aviation operations, making it the central authority in the realm of aviational governance in the country.

The other organizations mentioned serve different roles or operate in other jurisdictions. For instance, the FAR (Federal Aviation Regulations) are the rules established by the FAA, but they do not have an independent regulatory function. EASA (European Union Aviation Safety Agency) is responsible for aviation safety in the European Union, not in the U.S. Likewise, PCAR usually refers to the regulations specific to a particular aviation authority but is not a governing body like the FAA. Therefore, the FAA stands out as the definitive organization for aviation control in the United States.