i spent a 100 or so replacing the tiny 16$ keychain pocket knives for my fiance's keychain after 911, after 5 replacements, and loosing a gerber multitool, she learned to live w/o one... yea i know, why didn't she remember to take it off b4 flying? who remembers? especially something on your keychain, and none of those knives ever made it back to me... (sign a form they mail it i think, or pick it up after your flight)