Hmm, those security chaps still haven't worked out that a pilot doesn't need a knife to crash an aircraft.
I hear this stupid comment all the time. It's not the pilot highjacking his own aircraft that's the concern. The concern is that the pilot passes the knife off to another person in the terminal who then gets on another aircraft.
If any pilot is dense enough to think it's okay to bring a knife through security because he's a pilot, then he deserves whatever happens to him as a result. Hopefully this involves getting fired. We don't need any more stupidity in the cockpit than we already have.