What are the two means of identifying the transmitting aircraft used by ADS-B?

The correct identification of the transmitting aircraft in ADS-B (Automatic Dependent Surveillance–Broadcast) utilizes two specific elements: the Aircraft Address and the Flight Identification.

The Aircraft Address is a unique 24-bit code assigned to each aircraft, ensuring that it can be uniquely identified across the air traffic system. This address is pivotal for differentiating one aircraft from another in the ADS-B environment.

The Flight Identification refers to the alphanumeric designator that corresponds to a particular flight. This could be the airline's flight number or a unique identifier assigned by a private operator. Together, these two components allow for accurate tracking and identification of aircraft, enhancing situational awareness for air traffic controllers and improving overall safety in airspace management.

The other options do not accurately reflect the primary means used for aircraft identification in ADS-B. For example, while a radar ID and registration number might be useful in traditional radar systems, they are not the designated means in ADS-B technology. GPS coordinates typically provide information about the aircraft's position but do not serve as identifiers for the aircraft itself.