Originally Posted by YYT82

Earlier this year I had the same experience with AC810 (YYZ-IST), when all classes were zeroed out. This happened a couple of weeks before AC officially cancelled the scheduled flight. Due to load issues and finalizing the winter schedule, AC may be considering reduction in frequency and your flight might be affected. You don't need to do anything right now, but start searching for alternate routings/options. When/If AC does indeed cancel your flight, you can then call in and demand basically anything you want, provided routing rules allow it.