Other experimental units were the 1st and 2nd Airboat Platoons, which operated Hurricane Aircat airboats. Anderson is also seen riding an airboat through the swamp in some scenes. Hydrocopters are powered by a fixed bladed aircraft propeller, the same as an airboat. Meanwhile, Penny and the mice commandeer Medusa's swamp-mobile, a makeshift airboat. The accident site was only accessible via airboat and helicopter. Their airboat had no seat, so the skipper was forced to kneel in the boat. Modern airboat designs are significantly quieter thanks to mufflers and multi-blade carbon-fiber propellers. Airboat manufacturers tend to be small, family run businesses that assemble built-to-order boats. The first passenger-carrying airline flight happened in 1913 with the St. Petersburg-Tampa Airboat Line. Modern, commercially manufactured airboat hulls are made of aluminum or fiberglass. Airboat operators, pilots, or drivers in Florida must be 14 or older. The island is reached by a ferry in summer and an airboat in winter. The earliest ancestors of the airboat were waterborne vehicles for testing aircraft engines. The most efficient way to travel on this part of the river is by airboat. The Cadillac itself has the ability to transform into an airboat and a camper.