(CNN) — Nikki Stern lost her husband in the 9/11 terrorist attacks, and she doesn't understand why knives would be allowed in airplane cabins 12 years later.
Stern doesn't think box cutters killed her husband Jim Potorti, who was working at the World Trade Center when airliners crashed into the towers. "The planes flying into the buildings is what killed my husband," said Stern, an author and the first executive director of Families of September 11.
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