The largest airplane ever built is the Hughes H-4 Hercules flying boat. Its 97.5 m (hint: not height) wingspan is still the largest plane ever to be built. However, because it is made of birch, the mass of the H-4 is 185,000 kg, considerably lighter than any other giant plane. If the maximum gravitational potential energy associated with the H-4 was 37,000,000 J, how high did it fly?