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If you can't take a freaking shampoo bottle on the plane, what makes you think they'll let you pass with a KNIFE! Granted, they miss this stuff all the time, but come on, you really think a security guard will let you do that now?
In the completely rare case you did attack somebody with the knife on the plane, you think that security guard is going to have a job anymore? Even if they do have the exact same silverware on the plane, its that security guards ass on the line. Use whats on the plane just like everyone else.