How long are bird activity advisories valid?

Bird activity advisories are specifically designed to provide real-time information about bird movements that could pose a hazard to aircraft operations. The correct answer indicates that these advisories remain valid for 15 minutes or until visual observation reports confirm that the birds are no longer in the vicinity.

This time frame is crucial because bird activity can change rapidly, and maintaining up-to-date information helps ensure that pilots and air traffic controllers can make informed decisions regarding safety. By specifying a 15-minute validity, the advisory emphasizes the need for timely updates, as it recognizes that visual reports may indicate a quick change in the presence or absence of birds.

Other options mention different durations or conditions that don't align with the operational need for immediate updates inherent in managing bird activity. The focus is on providing the most current information to mitigate risks effectively.