Adding an airport will SHRINK a polygon.  A bigger polygon means a greater distance to the nearest airport.  Edit: Never mind, on thinking about your comment some more, you probably know that.<p>Where you will see larger polygons is across the United States, as corrupt local governments get paid by land developers to close airports and sell off the land.  Often these kangaroo councils operate under the guise of pandering to local residents, who moved next door to an airport and then started bitching about it in hopes of having it closed and boosting their property values once.<p>Make no mistake: These people are stealing from all of us.  Once an airport is closed, we&#x27;ll never get it back, and part of our national transportation infrastructure is destroyed.  Not to mention the damage to the future of aviation, which can&#x27;t fund innovation and invention if there&#x27;s no place to land.  See the current scam that&#x27;s threatening the Santa Monica airport for an example.<p>This is what happens when clowns and criminals run a city government: We can laugh at them, but they cause real and permanent damage.