 Carrying the nicknames "American Clipper", "Southern Clipper", and "Caribbean Clipper", they were the first of the series of 28 "Clipper"s that symbolized Pan Am between 1931 and 1946.During this time, Pan Am operated Clipper services to Latin America from the International Pan American Airport at Dinner Key in Miami, Florida.In 1937 Pan Am turned to Britain and France to begin seaplane service between the United States and Europe.