Army Air Corps ordered several under the designations C-21, C-26, and C-29. Subsequent examples were ordered by the United States Navy and US Coast Guard for use as transports and search and rescue craft. The first two were purchased by Wilmington-Catalina Airlines to fly passengers between Los Angeles and Santa Catalina Island, becoming the first successful Douglas airliners. There were a total of 58 aircraft over the life of its production run. The improved aircraft was named "Dolphin". Undaunted by the lack of demand, Douglas improved the Sinbad in 1931 so that it was amphibious, and could land on water or land. The Great Depression had curtailed demand for such extravagance, but Douglas managed to interest the United States Coast Guard who not only bought the Sinbad, but 12 Dolphins. The Sinbad was intended as a luxurious flying yacht. The Dolphin originated in 1930 as the "Sinbad," a pure flying boat without wheels.
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