At the time, there was no significant no-fly list.
There are many responsibilities of government. One basic one is to protect the citizens, to protect people, and one basic human right is security of the person. So what you do is work very hard, using the lawful investigative powers of your law enforcement, to try to prevent certain things from happening. And you do that with all your systems. And in the course of that, you have to design them carefully, you have to protect privacy, and you have to have a system that is efficient so people can travel, which is what they really want to do. But you get all the information you can in a lawful manner to try to stop exactly these sorts of individuals from getting on the planes in the first place.