Final answer:
The Federal Aviation Administration (FAA) keeps records showing who owns a particular aircraft.
Step-by-step explanation:
The agency that keeps records showing who owns a particular aircraft is the Federal Aviation Administration (FAA).
The FAA is an agency of the United States Department of Transportation. They are responsible for regulating and overseeing all aspects of civil aviation within the United States, including aircraft registration.
When an aircraft is registered, the FAA maintains records of the owner's information, including their name, address, and other relevant details. These records are used for identification, safety purposes, and to ensure compliance with aviation laws.