Lisunov Li-2 XT-111 & Convair CV240 XT-610
From The Dragon's Wings by William M. Leary, Jr. (Copyright © 1976):
"American business enterprise took the lead in advancing a program to inaugurate commercial air service in China. Curtiss-Wright, the leading aeronautical corporation in the United States at the time, founded the China National Aviation Corporation (CNAC) in partnership with the Chinese government in 1929. Subsequently taken over by Pan American Airways in 1933, CNAC pioneered commercial air service throughout the Middle Kingdom until the airline's demise in 1949."

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