This might help: flightstats.com/go/…flightAvailability.do The seat counters have been fairly accurate, in my experience, for flights with most airlines.
You could also try a one month subscription at www.expertflyer.com Award availability isn't listed for all airlines but I think AC is one that's included. If it isn't, you may still check the fare buckets for flights on your dates. The data provided is usually real time or near as can be. Could be worth the $US 5 for a one month subscription.
Many thanks, I found the above post very useful.
That is awesome. I am glad they have that. I have bookmarked that as well.