But why is it not bookable on the new two-class routes? We have three different cases here:

Domestic flights: One-class cabin. For a pure domestic flight it's not possible to book I awards anymore, at least not online. But if you have an international connection you can get I-class award for the domestic segment.

Intra-Scandi flights: Two-class cabin, I and X awards. I gets seating in Economy Extra.

New two-class routes: Two-class cabin, only X awards -- so not possible to sit up front on an award ticket, not even if you have a connecting flight .