As I indicated earlier, I believe it's a graduated process that we would follow with an operator. If we see a problem with their safety management system, the first thing we would like to do is talk to them about it, ask them for a corrective action plan. They would submit the plan. We would analyze it and see whether it's going to achieve the desired result. If we think it is, we give them time to implement it.
If that doesn't work, we step up the amount of surveillance we may do with that particular company. We may get to a point where we do administrative monetary penalties. Then as we move on we can go up to pulling the operating certificate of a particular company if they don't appear to be compliant. Or, at any point in time if we find the situation is so grave, we can and we have pulled operating certificates of companies that we feel just aren't up to snuff, and we don't hesitate to do so.
It's probably most mature in the aviation sector that we have these business practices, so I'll let Mr. Eley provide some colour in that regard.