An amphibian delta wing jet aircraft, which has a plurality of triangular folding wing panels, two of which are hingedly attached to a lifting shape body, which incorporates a W-shaped hull in it's cross section of a fuselage so that the craft operates efficiently as an aircraft when flying through the air with the wings in a fully unfolded extended position. The craft also performs well as a watercraft capable of relatively high speeds on the water surface when the wing are folded-up in a non extended position. The W-shape hull transverse cross section also provides excellent characteristics so that the craft can hydroplane over marshlands or waterlogged soil which may be covered with emersed rushes, or snow, cattails and other tall grasses. The craft is also provided with four retractably mounted mechanically extendable wheels, to be utilized when configured as a land vehicle.