Someone asked what I thought about the lines at the TSA, here was my answer:
"I think the largest liability in airline security is the line. Terrorist can get in line waits til he's in the middle where there's a lot of people around and *boom*. Just like in Brussels. If the police, bomb sniffing dogs, TSA, etc begin to approach you while you are in line *boom*. But I spend 1/2 my life think of and finding vulnerabilities in websites, so I look at these things differently."
Many of my friends will tell you that for years I've felt the bottleneck in the security was the weak point. The attack in Brussels on the insecure side of the airport validated that thought.