This cover was in the first airmail flight between Hong Kong and San Francisco. A Martin M-130, the Pan Am China Clipper, carried the mail. The aircraft left Hong Kong on April 28th, 1937 and arrived in San Francisco on May 4th, 1937. Many stopovers were part of the route and are indicated on the cover.
The China Clipper was destroyed in 1945 when its double hull ruptured due to a collision with an obstacle in the waters of Port-of-Spain, Trininad. The aircraft sank and 23 people were killed. There was only 7 survivors.
