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. However, the subsequent Jaegerist uprising overturns all plans for this test of the Founding Titan's power. At the end of Marley's counterattack in Shiganshina District, Eren begins a full-scale Rumbling to slaughter all life outside of Paradis Island.

Intending to put a stop to Eren's mass genocide, the Jaegerist-opposed members of the Scout Regiment join forces with Marley's surviving Warriors and head to Paradis's harbor where the flying boat is docked. However, upon reaching the harbor, they find out that it is overrun with Jaegerist forces who are ready to destroy the flying boat should anyone attempt to commandeer it. Armin Arlelt and Conny Springer initially attempt non-hostile coercion to take the flying boat from Samuel Linke-Jackson and Daz before they can detonate the explosives rigged to the plane. However, conflict escalates elsewhere in the harbor leading to an all-out battle for the flying boat. The Eldian-Marleyan alliance eventually drives off the Jaegerist force and escapes by ship, with the flying boat in tow. They head towards Odiha to service the craft, as by then, the Rumbling would have already reached Liberio.