Flying boat (Anime)

The flying boat (飛行艇) is a multi-purpose airplane developed by the nation of Hizuru some time during the years 852 and 853.

Uses
As the name suggests, the flying boat can function as both a ship and an airplane depending on the users' needs.

The ship produced by Hizuru is fueled by Iceburst Stones found in Paradis Island.

War for Paradis arc
Shortly before the first meeting of the people of Hizuru and Paradis Island, Zeke Jaeger meets with Hizuru ambassador Kiyomi Azumabito in secret to encourage an alliance between Hizuru and Eldia. Hizuru quickly manages to fully realize the potential of the Iceburst Stone, integrating it as the primary fuel source for their newly developed flying boat.

After Eren's raid on Liberio, Kiyomi returns to Paradis Island with the newly developed flying boat, intending on using the ship to view a small-scale Rumbling from an aerial perspective.