The University of Southern California reported in a study funded by the Federal Emergency Management Agency that “the capability of MANPADS to reach targets at altitudes of up to or beyond 15,000 feet allow these weapons to be used at a radius of 50 miles or more from most airports, making perimeter facility control largely ineffective.” Northrop Grumman has also estimated that "the zone of vulnerability around the airport is 300 square miles."
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