Unfamiliarity

How the Ships Harness Energy:
Through sun energy, by ‘catching’ lightning, and by wind. Fuel concepts are also a possibility through use of whale oil.

The Repair and Maintenance of Ships:
Getting materials to build and repair ships: There are GIANT ships that serve as their own biomes for growing trees and other rarer material to sell to other ships. Also by gathering material and bones from large creatures that live in the skies.