There was an interesting article on this in the AFR about the security (or lack there of) in the US for air travel. The reason given is that airside staff generally do not work unattended and therefore someone would notice unusual activity. It was also claimed that it doesn't make sense to screen someone who drives a refuelling truck (as an example).
The article was saying the two biggest and therefore most significant changes to security were re-inforced cockpit doors and a change in sentiment from PAX and operating crew from following instructions to fight back.
I am sure there are more productive measures such as seperation of duties, mandatory 2 weeks of vacation and the use of security cameras which would be more effective than screening. Screening is of course only going to catch dumb terrorists. One would hope that more productive measures are in place and that screening is just there for appearance so we all feel safer.
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