I think that's a very valid question. Thank you.
I think the issue we all face at the moment is that because GTAA and NavCan are private companies, there is no freedom of information involved, and therefore we cannot see how decisions are made, so we cannot understand how they're trying to do things. In terms of the decibel levels, there has to be some clarity around that. There has to be some agreement among everyone on what that looks like.
More importantly, when we speak with pilots and when we do our research, we find there are two kinds of aircraft noise. There is the noise when you're coming down to land. There's not much you can do about that. You're coming in to land as an aircraft. But, there is a lot you can do about the downwind, which is the initial descent before you turn. I think within that, discussions about decibel levels can be had. Agreements can be made. Planes can fly more quietly and they can fly higher.
Some of that has been undertaken already, but the decibel issue itself is a massive problem worldwide, and I don't think you're going to find agreements anywhere in airports. Those are not happening.