There's still a lot to learn. We feel that the crux of the problem, though, is that we have noise and that noise isn't going away. We have people who are being impacted negatively by this noise, but as we said, the intermediate is the annoyance associated with this. That's where we need to have a better understanding. It's the annoyance from the aircraft and the expectations that people have of the noise that are generating the complaints and some of the health impacts.
Statistically, when you look at the number of people actually impacted through annoyance, it's not nearly as high as we think. However, they're also a very vocal group with a very valid concern. This is the approach that we need to take, to tie in the subjective with the real physical aspects of the noise that's being generated.
We should look to Australia and some of the things they're doing, because this is a more holistic approach that has been very effective so far, even though it's also in the early stages.