Sikorsky S-40 - Wikipedia
https://en.wikipedia.org/wiki/Sikorsky_S-40
The Sikorsky S-40 was an American amphibious flying boat built by Sikorsky in the early 1930s for Pan American Airways. Sikorsky designed the S-40 in response to a request from Juan Trippe, president of Pan American Airways, for a larger passenger carrying airplane.