That is a good question. It is difficult to answer with respect to past incidents. However, we have seen incidents and other circumstances and we think this list, this program will provide another layer of safety and security for the aviation system. It will not answer all the questions or solve all the problems, but it will answer the question that came up with respect to the events that occurred on September 11, 2001 and more recent events regarding the activities that were suggested by others. In my opinion, this program will be very beneficial.
On June 7th, 2007. See this statement in context.