There will be those amongst us who will belong to 'the horse has bolted' brigade, others who will only become believers when the apparition which appeared in the cockpit is only too unpleasantly real, and yet others who however reluctantly, acknowledge that once more we are faced with trying to look for ways to cope with yet one more additional problem in our chosen profession.
I am prepared to bet that had Wilbur turned to Orville and said ' now we have to start working on airspeed indicator/altimeter/ wheels/brakes' Orville may well have been a tad sceptical but also that he may well even have asked him why? and then followed that with how shall we begin? rather than telling him 'we probably won't ever need them!.
Terrorists in todays world pose us a multitude of questions moral, ethical and practical, it is up to us to find the answers, and saying it probably will not happen again won't hack it. These people are lethal, death is their aim, that is the point of their being what they are. Yes guns are dangerous, so is flying and so are the new fanatical hijackers.