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The seaplane industry expanded widely between the periods of World War I and World War II. Seaplanes were commonly used by military water rescue missions, reconnaissance and anti-submarine warfare7. However, with the introduction of new efficient aircraft designs and suitable landplane infrastructure, the use of the seaplanes declined. No new advanced designs have been created, and most seaplanes existing these days are approaching its final operating life. The purpose of this paper is to introduce a new advance concept design for a seaplane, in which costs caused by manufacturing and regulations will be reduce. In order to reduce these costs, existing aircrafts presented will be configured into a seaplane by adding a floating device. Many proposed ideas were analyzed, but due to the complexity and high costs of some of these, it was decided to use retractable floats to reduce drag and a trimaran boat hull to increase hydrodynamic performance of the seaplane.