National Geographic : 1936 Dec
BLAZING AN ALL-AMERICAN TRAIL ACROSS THE PACIFIC OCEAN Pioneer of the new route was the Pan American Clipper, called "The Flying Gas Tank" by those who knew her best. She made the first flight for solarge aship, 18 tons, from the mainland to Honolulu and back. Then she blazed the way to the island bases of Midway, Wake, and finally Guam, returning toSan Francisco each time and taking different officers so that crews might be trained. This veteran Sikorsky with its pontoons can be distinguished at aglance from the much larger 25' ton Martin-built ships being used in regular service-the China, Philippine, and Hawaii Clippers (pages 671, 673, 676, and 682).