Dragonsail flying from the book, Badass Twins By Kevin B. Leigh

The dragonsail flew on into the cloudy moonless night. Once in a while the captain could see openings to the stars above. Other than that and the twinkling lights from the other dragonsail, the night was pitch-black as they crossed the vastness of the Etmá Sea. After several hours, the lights of fishing villages came into view as sea subsided into land again.

Dragonsails are large dragonfly-like creatures that can carry passengers in a pilothouse attached to its back.