The American Clipper, a Sikorsky S-40 flying boat built in 1931 by Sikorsky Aircraft for the Pan American Airways.
Fullsize image: https://s3-us-west-1.amazonaws.com/h...r_fullsize.jpg
Previously:
Hughes H-4 Hercules Spruce Goose - photos
Inside a 1930s passenger plane - photo
1923 Farman F.120 sesquiplane airliner - photos
Saunders-Roe Princess flying boat - photos
Caproni Ca.60 Transaereo flying boat - photo
1922 Nungesser canard seaplane - photos
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