<font face="Verdana, Arial, Helvetica, sans-serif" size="2">Why do you keep bringing up 9-11 as if anything a screener had done could have made a difference? Boxcutters were allowed at the time.</font>
I might also add that NOBODY knows...or ever will...what actually brought down those planes. For all we know, the hijackers were equipped with machetes, bandoliers, AK 47's, etc. A few cell phone reports about boxcutters being used does not fully explain what happened on all the planes.
At any rate, boxcutters, wallet knives and "other small pointy things" would have a very slim chance of bringing down a plane today. The key weapon the terrorists had on 9/11 was surprise and that weapon is now obsolete.