Thank you FlyerTalk member Bobato for posting this deal!
You can fly between Toronto YYZ and Hong Kong HKG for $596CAD, round-trip & taxes included, on American Airlines. This is a really good deal.
To find availability, use Google Flights. Although the availability looks sparse on Google Flights, I’m actually finding if you click through some of the higher fares, the lower fare pops up, and is more available than it originally shows.