Pan Am had only 3 of theese great aircraft, the famous China Clipper, the Philippine Clipper and the Hawaiian Clipper. None of theese aircraft survieved the heavy duty over the Pacific. The China Clipper sank in Port of Spainin January 1945, the Hawaiian Clipper was lost near Manila in 1938 after only two years of service. The last one hit a mountain in California in 1943.