The Airgator Airboat 09 is a flat-bottomed airboat due to appear in Grand Theft Auto VI. It has been seen in two official screenshots of the Grassrivers, where it supports alligator hunting and fishing, and one is pursued by a Buzzard Attack Chopper in the second trailer. Judging by its design and naming scheme, it appears to be based on recreational hunting and fishing models from Diamondback Airboats.
Vehicle data via GTA Wiki (Fandom), CC BY-SA 3.0.