Pan American Airways began in 1927 with a borrowed seaplane and a USPS contract to deliver mail to Cuba. Within a decade, Pan Am had become the United States’ premier international commercial airline. Using a combination of land and amphibian aircraft, Pan Am built an extensive service that covered the Caribbean islands and South America. When founder Juan Trippe set his sights on spanning the oceans in the mid-1930s, he turned to massive flying boats as the solution because few all-weather runways existed that could handle the weight of giant long-range aircraft. Follow the evolution of Pan Am’s luxurious amphibian “Clipper Ships” as they first conquered the Americas and then both oceans in this golden period of commercial aviation that ended with the start of World War II.