I did YYZ to YQM last week and was Star alliance in coming and joining AC for the domestic sector. Bags were thru checked for YQM and I had a night layover I had to go to immigration and customs and also collect my bag and come back the next morning and put it on the automatic belts. Then go thru security for my domestic flight. I also did hear something about AC sending the bags directly to some destinations on the domestic route but since I do not fly AC on the international route now I do not know about it.