Julian - the dehumanising aspects of flying are many and varied and do not just concern security screening, but that's best left to another thread. Seems to me that very many passengers are doing exactly what you suggest and sticking to Eastenders and a mug of Horlicks.....and an awful lot of us are going to be without jobs before long.
Mr. Chips - sorry to offend your sensitivities, my point regarding the security people inside the WTC was made purely to show that even security people don't always know what's going to happen next or what's best for everyone else, albeit through no fault of their own. The essential point is that, however stringent security checking becomes, you cannot always prevent this kind of atrocity being committed by totally ruthless and uncompromising criminals.