Thanks for the clarification, it has been a while since I played and the exact words over the Governor had escaped me. So let's assume he indeed means there wasn't any other spaceship. I can imagine there were wrecks or derelicts, they wouldn't classify as ships as anymore. I can't believe that the ships that collided over Dezoris were the very last ships, that somehow seems strange as space travel back then was still practiced and what self respecting space faring nation would keep only three ships? So it's quite possible the rest was shipped off as junk to Roron.
I can imagine that the knowledge of space ships, space faring etc was not completely lost, surely the library in Paseo had some documents. They couldn't have reactivated old derelicts, possibly with Motavian help, to create smaller shuttles to ferry between Motavia and Zelan/Kuran.
What I wonder, why did the Palmans have such a large fleet of World Ships at the ready? Did they expect Palma to get destroyed and foresaw the need for evacuation? Surely they couldn't have built 400 ships and evacuated their people after noticing Gaira on a collision course. In fact, starting the evacuation alone once they noted Gaira should have been an impossible task in my eyes. Perhaps this should go into a new topic, I feel it's worth exploring.