Full body scanning could be a great improvement, provided it replaces some other, more invasive measures. I would much rather be scanned by magic eyes (which seem to have no problematic radiation), rather than be patted down (especially as I will not have to look at images of myself). Of course this is security theatre, but we need a bit of security theatre so as not to make it too easy for loonies and opportunists. The more the Bad Guys have to plan, the more chance there is for intelligence services to pick up the information that will be really effective. Profiling would be good, too, as long as it's flexible. At the moment it's the Jihadis who are mostly threatening airlines, but lots of ideologies are capable of inspiring people to slaughter the innocent, not to mention the cases of aeroplanes that have been bombed to commit ordinary, old-fashioned murder. Profiling by itself won't stop everyone.