Finally, our airship unlocked Sector 8 and was able to visit it on its last journey! I confirm that visiting Sector 08 is definitely the way to unlock second airship, though nothing seems to show up in the voyage log indicating this, you'll see it in FC activity log. Too bad it took us until rank 30 for RNG sector unlock to kick in. Airship is full Enterprise by now and has been aptly renamed enDERPrise

By the way... our FC is moving to a large house this weekend. we'll have info about what happens when you dismantle an airship, destroy the workshop and rebuild it in a new house. This would be good stuff to add to the guide, once we know what's preserved and what's lost in such cases.