High-rise structures today are expected to be made safer, but there's no guarantee that they can survive a direct hit from a Boeing 767 airliner like the ones that struck the World Trade Center towers on Sept. 11, 2001. Builders can learn from the towers' collapse, however, and take steps to construct safer buildings and minimize the number of casualties in the event of a disaster, New York City architect Barbara Nadel said. "A really comprehensive security plan integrates design, technology and operation," she said.

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