The first aircraft of Inter Island Airways. Flown from the factory in Delaware to San Francisco and shipped to Hawaii where it first flew on 6 October 1929. Carried 12,000 people on $3 sightseeing flights. Sold to Alaska in 1933. Survives. Photo from: San Diego Air & Space Museum

The first two S-43s of Inter Island Airways and three older S-38s, the nearest of which is NC4V Molokai. We gather that only two S-38s remained in service by 1939. Photo from: Smithsonian Institution

This twin-finned S-43 was added to the Inter Island Airways of Hawaii fleet in 1938. It was sold to KNILM in 1941, becoming PK-AFX. Photo from: State of Hawaii Department of Transportation

The prototype of the S-43, first flown as NX15061 on 5 June 1935 from the Houstatonic River, Connecticut. As we can see here, the 'Baby Clipper' reached Hawaii per ship to become Inter Island Airways fleet number 5. Photo from: State of Hawaii Department of Transportation

This was the third S-43 for Inter Island Airways. Many sources claim that this aircraft became N326 at some point, but this is not correct (N326 was c/n 4342). This airframe was later preserved at the Pima Air & Space Museum, falsely marked as US Marines 1061. Photo from: Dan Shumaker collection

Inter Island Airways of Hawaii was the first airline to fly the S-43, with the prototype NC15061 entering service in December 1935 and NC15062 in February 1936. The company became Hawaiian Airlines on 1 October 1941. NC15062 later acquired by Reeve Aleutian Airways as a spares source. Forward fuselage survives at the Alaska Aviation Museum, Lake Hood. Photo from: State of Hawaii Department of Transportation