What does a flashing green light indicate when airborne?

When airborne, a flashing green light indicates that the pilot should turn back for landing. This signal is a communication from air traffic control that identifies a need for the aircraft to return to the airport, typically because of a change in status or an issue that requires attention. The flashing green light is a crucial signal in maintaining safe communication between pilots and air traffic services, ensuring that pilots are aware of when to adjust their flight paths.

Understanding this signal is essential for pilots for maintaining situational awareness and adherence to air traffic control instructions. It helps in safely managing the aircraft's return, especially when there might be other operations or emergencies to consider at the airport.