Hey - now that whole gun control debate is starting to make sense! There sure is no way you can get rid of every possible offensive weapon on an aircraft (ladies hair pin, compact mirror, steel pens, disabled crutches), so why the hell not give everyone a 12 inch survival knife??? Crazy as it sounds, you can bet that not one of those planes would have been taken over and brought down, and If I ever found myself in such a dreadful situation, I would be cursing the fact that I had nothing to defend myself with since all the sharp objects had been removed from around me... So the answer is (in all seriousness) - arm the flight crew.