How would the terrorists get guns aboard? They didn’t even have drivers licenses let alone concealed carry permits, which do an extensive background.
No, with one CCW aboard, with courage, it would be “Drop the boxcutters or you all die!”
I think it may well be that way next time anyway. While I have no present plans to fly, neither do I plan to sit mouselike in such a case. Crap will happen, if I have only my hands with which to bring it.