I mentioned the other day that we work on three things. One is to make sure we meet the highest possible standards in terms of aircraft noise, and we're part of the process. ICAO raises those standards periodically. We're certainly very much involved, and more changes are coming in the next few years. So it's making sure we have aircraft that clearly meet the latest standards--and those have always been applied consistently in Canada--and that applies not only to our aircraft but foreign aircraft coming in. That has an across-the-board impact when those standards get raised.
The noise abatement procedures—there are some standard solutions, if you like, in terms of noise abatement, depending on the circumstances. Those are used fairly consistently and they are meant to represent the best practices in terms of how you deal with noise abatement. They're subject to whether or not you're dealing with perhaps a residential community very close to the airport or further away. There are a couple of different profiles they'll typically use, but again—