First of all, we really do not know how the hijackers got the knives, and my belief is that the public still does not know what really happened.

Secondly, employees should go through elaborate security checks also. I saw a show on TV where an El-Al security expert said the same thing. There was a case mentioned of how a disgruntled airline employee once bypassed security and caused an airline crash. The security expert also said that there must be a comprehensive approach to security, not just patches here and there. I believe that this is what UALover7 is saying, and I agree with him - whatever the age of UALover7.