Under the plan, knives with blades that are 2.36 inches or shorter and less than a half-inch wide will be allowed in airline cabins so long as the blade is not fixed or does not lock into place.

CNN: U.S. to keep restriction on small knives on planes for now

Under the new rules, which go into effect April 25, knives with blades that are 2.36 inches (6 centimeters) or shorter and less than a half-inch wide will be allowed in airline cabins so long as the blade is not fixed or does not lock into place.

CNN: TSA chief faces critics, says new knife policy will stand

Under the new rules outlined this week, knives with blades no longer than 2.36 inches (6 centimeters) and less than a half-inch wide will be allowed in airline cabins as long as the blade is retractable and does not lock into place.

CNN: March 10, 2013 -- Updated 0334 GMT (1134 HKT)