The Sikorsky S-40 and Sikorsky S-42

The Sikorsky S-40 was placed in operation by Pan American World Airways in 1931. Igor Sikorsky and Charles Lindbergh then designed the larger Sikorsky S-42. The S-40s were the first four-engine aircraft to be regularly used in commercial air service.

Sikorsky S-42 plane flying over a sailing galleon - Miami, Florida
Interior view of Sikorsky S-40 plane with passengers - Miami, Florida
Passengers boarding a Sikorsky S-40 plane - Miami, Florida

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