Which format is correct to initiate initial radio contact with an aircraft?

The correct format to initiate initial radio contact with an aircraft is to state the identification of the aircraft first, followed by the identification of the ATC unit, any message that may be relevant, and concluding with the word "OVER." This format adheres to standard radio communication protocols, ensuring clarity and proper identification at the start of the transmission.

Beginning with the identification of the aircraft allows the ATC unit and other listeners to immediately recognize who is speaking and contextually understand the information that will follow. Following this with the ATC unit's identification helps to confirm that the communication is taking place with the correct air traffic control authority. Including any necessary messages at this stage provides essential information that may impact the communication or flight, while the term "OVER" indicates that the transmission has concluded and the other party is invited to respond.

Using this structured approach enhances situational awareness and minimizes the chances of miscommunication in an environment where clarity is critical for safety and operational efficiency.