Sikorsky S-43 was a scaled down version of the four-engine
S-42 and first flew in 1935.
The S-43 entered service with Pan American in 1936
on routes in the Caribbean and Brazil. Other operators flew
this aircraft in China, Hawaii, Norway, the Philippines, Russia and
West Africa. The S-43 was used by the U.S. Navy and Marine
Corps (JRS-1) and U.S. Army (OA-8 and OA-11).