Page 37 - Chinese International Airmail to 1949
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1.4.2 PAA Clipper from Manila to San Francisco
Rate 3: 1 Nov 1939 to 31 Oct 1941 (731 days). Surface first 20g $0.50 Air per 5g $3.75 Registration fee $0.50
15 Jun 1940 ‑ Shanghai to Wilmington, USA. By Honolulu Clipper, leaving Manila on 18 Jun 1940. Double rate $0.50 + 2 x $3.75 = $8.00.
18 Aug 1941 ‑ Shanghai to New York, USA. Backstamped at Honolulu (4 Sep) and New York (7 & 8 Sep). Carried by Philippine Clipper,
leaving Hong Kong on 28 Aug 1941. Single rate registered letter $0.50 + $3.75 + $0.50 = $4.75.