Some security consultants say last week's police chase that ended on a runway at Love Field highlights the need for stronger perimeter security. "Hitting the perimeter defenses is the easiest way to breach airport [security] in the U.S.," says consultant Rafi Sela -- especially for urban airports surrounded by busy streets. The job can be huge: Dallas/Fort Worth International Airport has more than 35 miles of perimeter to monitor, and security there has been enhanced since a similar police chase four years ago. Surveillance cameras, vehicle immobilizing technologies and even nets have been added to keep unauthorized cars away from aircraft, says a DFW spokesman.

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