What does a flashing green light in flight signify?

A flashing green light in flight specifically signifies that the aircraft should return for landing. This signal is part of the communication system used by air traffic control to indicate to pilots that they need to head back to their landing approach. Pilots must be vigilant when they see this signal, as it prompts them to prepare for a landing sequence, ensuring that they are in the correct airspace and prepared for the landing phase of flight.

Understanding the context of this signal is crucial for maintaining safety and compliance in the airspace. Other choices represent different signals: a steady green light indicates that an aircraft is cleared to land, while a flashing green light on the ground indicates taxi clearance. Additionally, giving way to other aircraft usually involves instructions communicated through different signals or air traffic directives, reinforcing the importance of recognizing and responding appropriately to visual cues during flight.