Thurman Munson redux

Did the Yankees just lose another player piloting a small aircraft? There are reports that the plane that flew into the side of a Manhattan apartment building this afternoon was being piloted by Cory Lidle, who the Yankees acquired from the Phillies (with Bobby Abreu) at the trading deadline...

As to the people asking "where was homeland security?" short of closing the airspace over Manhattan entirely, and putting anti-aircraft batteries around the city's perimeter to shoot down anything approaching, what, exactly, would they sugggest is the proper way to defend against the accidental crash of a small plane?