An Everglades-style airboat is due to appear in Grand Theft Auto VI, first revealed in the September 2022 leaks, where test footage showed it parked at Vice City International Airport with working fan and turning-fin animations. It was later seen gliding through the Grassrivers in the first trailer, and it appears to be based on various custom fanboats built by Panther Airboats.
Vehicle data via GTA Wiki (Fandom), CC BY-SA 3.0.