Flew down to Calgary on AC Saturday afternoon at 4 pm. Pretty empty DC9 in both classes, as you experienced. Maple Leaf Lounge had meagre supply of ice cream bars in Edmonton (no Hagen Daz, as advertised!) and plenty of cheese. Flew back Monday at 5:15 on a full DC9. Calgary MLL had lots of Hagen Daz bars, and Guiness in the cooler. The later weekday flight is used to feed connections from London and Frankfurt up to Edmonton I suspect, and is always full.