I tried to use my Airmiles for flights on Canjet for April/06 when the flights were first released by Canjet in July. I was told that Airmiles did not receive any seat allocations from them for that flight.
I laugh when I look at the Gold card benefits which include 2 day advance booking when you had your issue and I had mine. The seats are clearly long gone by then or were never available.
Obviously some people get the seats, but I am glad I didn't count on being able to use the points for flights. I used them for park tickets instead - I know there are people who will say you get less bang for the buck, but at least you can use them for this item.