| http://www.w3.org/ns/prov#value | - Although knives with blades less than four inches (about 10 cm) in length were allowed in the passenger cabin prior to 9/11, knives of any length have since joined a long list of items banned from the passenger cabin.The TSA, which was formed after 9/11, has numerous procedures in place to prevent knives, box cutters, and other contraband from entering the secure area of the airport.
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