With the ease of travel and trade between China and the USA today, it's salutary to remember the years when such contacts were slow, laborious and very expensive. Pan Am's China Clipper air service flew between San Francisco and Canton - today known as Guangzhou - in the 1930's. The journey took a week (weather permitting), and stopped at Hawaii, Midway, Wake Island, Guam, Manila, Macao and Hong Kong.
Here's a 1930's dramatized film report about the journey. We've covered the China Clipper flying boats in these pages before, so those who remember that earlier article can see some of them in operation here. I recommend watching it in full-screen mode.
Note, too, how travelers dressed for their flights as if for the theater or for business. I think we've lost something with our overly casual approach, compared to what was, not so long ago, considered with awe as a miracle of modern engineering.