I do not know AY's procedures. As far as AA's, it is just from my repeated experience that I deduced what seemed obvious to me after a few years of doing this. I assume that is the case with AA, but I have no difinitive doumentation indicating so. AA may well have an acutal physical limitation of releasing a seasonal schedule prior to a year before the end of the seasonal schedule for all I know. It would actaully make sense if that were the case and would explain why early dates of a seasonal schedule were not available at the 320/330 day window.