We have significant cargo operations at Calgary airport. Some of the major freighter carriers have new jets that are quieter, but many of the cargo planes are previous-generation jets. They will be older 767s, some 777s, which are noisier than, say, the 787. Effectively, you have passenger jets and when that generation of jets is done, some of those jets are reconditioned and repurposed as cargo, so they are louder planes.
On October 30th, 2018. See this statement in context.