Originally Posted by
davidwu
I see whats going on after reading this. So A availability doesn't mean nothing for me booking economy class.
EF is showing 31 seats available in Business though, so I have high hope for getting upgraded, just not instantly
That is essentially what's going on. The website shows SWU available if Y>J (C) OR J>F (A) upgrades are available. Since 772 flights almost always have A inventory available, this is not terribly useful if you are upgrading Y>J.