I appreciate what the background of your question is. We don't think that behavioural analysis will play a significant role. There is potentially a place for identification of clear signs to note, and there is a trial program under way today in Canada. We believe more strongly, though, in the technological solutions. Given our passenger volumes, we think that's the better route, the more efficient route to follow.
The testimony that John McKenna indicated was that what we should do is move away from using very old technology and move to the newer, more efficient model.