SeaMax amphibious light sport aircraft from SeaMax America. Dan Johnson and the Light Sport and Ultralight Flyer take a look at the SeaMax amphibious light sport aircraft. SeaMax is a Brazilian design that has sold well in Europe. After U.S. partner SeaMax USA helped earn SLSA approval, Americans became aware of this lovely little seaplane. It seems little and looks small, but holds two occupants in comfort and flies with great enthusiasm.