I rely heavily on those J seats. They were consistantly avaliable on most days for at least the past year. Took J flights MEL-LAX and SFO-MEL earlier this year. We are heading that way in October and everything has dried up for months. I am dreading the 15hr flight at the back of the plane.
Looks like Air Canada has stepped up a little. They have released avalablity for the last two months but its not as consistent and often only 1 seat. I will have to move to Qantas FF if this doesnt improve, I'm only dedicated to Velocity for the Polaris seats (husband is from Canada so we travel that way a lot).