The limit was'nt on knives, but the size of the knife. Amazing how the corporate greaseballs have trimmed their budget over the years. Someone could get on board with an x-acto knife if it was the right size. American Airlines have been one of the airlines that have cut things over the years. See the movie "Wall Street" and it might make more sense. In Chicago, they started putting undercover police officers on the Rapid Transit Lines. Helped reduce crime, but there is always the looney who thinks they are smarter than the system.