Originally Posted by
sts603
Any tool other than calling to determine if space to upgrade full Y-J is available on BA?
I don't know if there's a different arrangement if you're using AA miles, but BA members can't upgrade Y -> J, only W -> J.
I believe the upgrade inventory on BA is the same as the J award inventory, ie if a J award is available you can get an upgrade, subject to the comment in the previous paragraph.