What indicates that an aircraft is maneuvering in the air?

Flashing anti-collision lights are specifically designed to enhance the visibility of an aircraft to other pilots and ground personnel. These lights are activated during flight and serve the purpose of signaling that the aircraft is in motion or maneuvering. Their bright and intermittent nature draws attention and indicates that the aircraft is actively engaged in flight operations, which could include various types of maneuvers.

While flashing landing lights may also be seen as a visual cue, they are primarily used to signal the intent to land or to enhance visibility during approach, rather than to indicate general maneuvering. Solid green lights, which are typically used as navigation lights, provide information about the aircraft's orientation but do not convey any active maneuvering status. Lastly, no visible lights would imply that the aircraft is likely in a non-operational state, thus not providing any clear indication of movement or activity.