Only a few options for taking care of this character and other Wildfowl.
1. Habitat Management, stop the lovies building ponds & lakes within you Bird Circle, also at your airport to keep planners happy.
2. Avoid building airports near lakes rivers and the sea. (recent new London airport proposal
3. Biological control of the population removing eggs treating eggs with chemicals, etc.
4. Plot movement of flocks, roosting sites, warn aircraft via BIRDTAM / NOTAM.
5. If encountered on your airfield and they won't move Shoot the
things.