Until you have seen it with your own eyes, walked past it and smelt it like I did this am at the Pentagon you don't appreciate what happened and I can't conceive of what the WTC looks like.
Sky marshalls, armed crew, mug shots of all paxs, and such are fine. The security aspect of the job should be with specialized crew, not half trained cabin crew (this isn't a slam on cabin crew, they didn't sign up to be police). Policy in dealing with hijackers must change too... shoot on sight, shoot to kill, shoot first and ask questions later.
appologies for the rant. I'm too close and this is too soon