Ok. Not that they were great at finding them anyway. On a flight a while back, I was going through my carry on/computer bag looking for fresh batteries for my noise canceling headset at 32,000 feet, and realized I had been carrying a medium sized Leatherman multi-tool with a 3 inch blade for months, and had transited at least 8-10 checkpoints at airports around the country. Guess they figured its better to allow em than get caught not catching them! Flight attendants might not like it, but I don't see an issue, the days of a plane being taken with a knife are over. Before, the game was to just comply, and wait during a plane takeover. They changed that in 2001, much fewer sheep now.