This goes to answering one of Mr. Liepert's questions as well, in terms of the noise standards around aircraft. ICAO sets standards in terms of noise at the source. It's regulation for noise at the source, and maybe Transport Canada can best speak to it. We accept those standards. As time goes by, chapters of aircraft—older aircraft—get retired and are not permitted in airspace. Over time, we are seeing aircraft getting significantly quieter.
On October 30th, 2018. See this statement in context.