I think a really good example of trying to identify an unknown risk would be some of the proactive exercises that we conduct, and when I say we, I mean collectively conduct.
One example would be something referred to as LOSA. LOSA is a line operations safety audit. Essentially, what it involves is taking trained observers, generally pilots, putting them in the flight deck and observing various behaviours of the flight crew in order to determine how those individuals manage various threats, various situations on board the airplane. That's a proactive activity that sometimes will uncover threats to the organization, but also the resiliency of the organization, behaviours that you want to manage.
Part of the safety management system is taking all of these elements that I think David mentioned earlier, the LOSA, the audit, which are the proactive, the investigations, the reports that come from flight attendants, pilots, and maintenance organizations.... All of that goes in, in order to give you a lens about what is going on within the organizations—where those hazards are; where those risks are—and feeding them back through the organizations so that they can manage those risks and then monitoring for the effectiveness of those solutions. It's an iterative process.
That would be an example of one that you will uncover because you don't know about it. It needs to be a proactive exercise. You just don't wait for it to happen.