Page 41 - Chinese International Airmail to 1949
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1.6 Chinese Internal Airmail with International Surface Mail
22 Sep 1931 ‑ Hankow to Durban, South Africa. Air from Hankow to Shanghai (914 km) flown by CNAC daily.
Single rate registered letter $0.25 (surface) + $0.15 (internal air ≤1,000 km) + $0.25 (registration) = $0.65.
27 Aug 1931 ‑ Hankow to Adelaide, Australia. Flown from Hankow to Shanghai by CNAC. Boxed handstamp AIRMAIL SERVICE
IN CHINA ONLY applied at Shanghai (McQueen Type 4). Single rate letter $0.25 (surface) + $0.25 (internal air) = $0.50.