Originally Posted by Daniel_

........The problem with stories about terrorists catastrophically bringing down dozens of flights is that bringing down just one is bloody hard....

.....To imagine that they could do this multiple times, on the same day, without anyone finding out about their plan, without one of then blowing themselves up on the way to the airport, or chickening out and confessing, or haivng their bomb fail to work, is to my mind (as a qualified and highly experienced Chemistry researcher and Project Manager) unlikely in the extreme. The cemistry and logistics are both insurmountable obstacles - it's just James Bond territory.

That doesn't mean we can be complacent, but it does mean that most of the security measures are heavilly overblown, and disproportionate.