If Transport Canada were to give waivers to any particular airline in terms of current training, Transport Canada should notify ICAO of the fact. But again, if, for example, Air Canada decides to give proficiency checks every two years, it would be perfectly legal for those pilots to fly within Canada, but it would be like driving without a licence outside Canada. That would apply even to a flight from Montreal to Halifax, because you would fly over the U.S.
On March 21st, 2007. See this statement in context.