During the period 1925-1928, what were the quickest commercial means of passenger travel from USA west coast to Tientsin-Peking or anywhere in Japan? For these means of travel, what were approximate travel times?

I'd like to say flying boat, but I am not sure they had 'em big enough to make the trip back then. When did the Boeing 314 hit the water? Answer: 1938. Out of service in 1946...

"In October 1936, Pan American finally inaugurated its first passenger flights across the Pacific by carrying nine travelers across the largest ocean in the world."

http://www.centennialofflight....na_clipper/Tran5.htm