Bugsmasher :
ElAl also have excellent security processes on the ground - that's how they caught a bomb given to a pregnant woman by her "boyfriend". Better trained, well motivated security staff would go a fair way towards the reduction of the risk, but it appears that governments and airlines have balked at the cost of this in the past.
What's the choice - forgetting the costs involved ? Something which requires NO engineering and can be done very rapidly, or a placebo solution which is only there until it's defeated again ?