For J class ZED's I believe we still have agreements to do so on Swiss, Etihad, Austrian, and TAP.

ID90's are pretty rare. Most interline discounts are a ZED or just a flat per segment fare. I remember back in the day we could buy J class on NWA and it was a different cost scale than a Y ZED. Also some carriers don't allow certain travel groups such as parents to travel on a ZED or charge a HIGH ZED for them and medium or low for the employee/dependents.