Which of the following is NOT a type of departure method?

A consistent departure plan is not recognized as a standard type of departure method. Departure methods are specific procedures used in aviation to ensure safe and efficient aircraft departures from runways, especially in terminal airspace. Each of the other listed options represents established practices used in aviation.

A Diverse Vector Area allows air traffic control to provide diverse vectors to aircraft, enabling them to navigate safely and efficiently after takeoff. Standard Instrument Departures (SIDs) are pre-defined routes that streamline departures from an airport, providing standardized navigation instructions. A Diverse Departure is a similar concept, focusing on creating flexibility in the paths that aircraft can take to exit an airspace while maintaining safety and efficiency.

In contrast, a consistent departure plan does not align with recognized departure methods and does not have established protocols or standardization in aviation practice. Understanding the definitions and applications of departure types is essential for safe flight operations, making it clear why this option does not fit into the established categories.