This last Aug. I flew from my home in Maui over to Sacramento with a short stop in Honolulu to change planes. I didn’t have a good carry on so I borrowed one from a friend but did not know there was a hunting knife in one of the little zip pockets. (a fold up one like a buck knife) I found it after I got to my destination and called home to let the friend know that his knife made it through. He had missed the knife and didn’t know what had happened to it, he thought he lost it somewhere. Well, he has his knife back now. Security missed it throughout my flight.
A friend of mine in 2005 got on an airplane with 2 6-inch long locking blades in his carry-on. Went right through security with no problems.