The term "Delta" shall be issued for a minimum of how many minutes?

The term "Delta" in air traffic control refers to a specific type of traffic advisory that indicates a potential change in the flight's status, typically related to a position report or request from an aircraft. It is crucial for effective communication between pilots and air traffic controllers to ensure safety and clarity during flight operations.

The correct answer is based on standard procedures that dictate that a "Delta" advisory must be issued for a minimum of four minutes. This timeframe allows adequate time for the aircraft to process the information and adjust its actions accordingly, ensuring that both the pilots and air traffic controllers maintain situational awareness and safety. Using a minimum of four minutes allows for effective monitoring and adjustment, as necessary, to account for the dynamic nature of air traffic operations.

Setting this specific minimum also creates a consistent standard across various scenarios encountered in air traffic control, making it easier for all parties involved to adhere to the established protocols and reduce the potential for misunderstanding or miscommunication.