The reason we are doing these types of pat downs and using the advanced imagery technology is trying to take the latest intelligence and how we know al Qaeda and affiliates want to hurt us, they want to bring down whether it is passenger air craft or cargo aircraft.

We save limited resources in terms of who we are physically screening. The approach will allow us to pay more attention to those potential terrorists.

I particularly recognize that reasonable people can disagree as to what that proper balance or blend is between privacy and security and safety.

The bottom line is, if somebody doesn't go through proper security screening, they're not going to go on the flight.

We put people of concern on the watch list or the no-fly list, so we have a number of layers of security beyond the airport checkpoint. We gather as much information about a passenger as the law allows without profiling.

I did not want to provide a blueprint or roadmap for the terrorists, saying 'Here are our new security procedures'.

The reason we are doing these types of pat downs and using the advanced imagery technology is trying to take the latest intelligence and how we know al Qaeda and affiliates want to hurt us, they want to bring down whether it is passenger air craft or cargo aircraft.