Posted : July 12, 1940 at Rangoon

Probable Route : BOAC Horseshoe Route Flight NE4 from Rangoon to Bangkok, July 19; BOAC Feeder Service Flight BH255 from Bangkok to Hong Kong on July 22; Pan American Airways FAM 14 California Clipper arrived Hong Kong July 22, departed July 23 for San Francisco, arriving on July 30; USA domestic airlines to Miami; FAM 6-10 to Panama; Panama arrival marking Aug 3, 1940 on reverse.

Notes : In June and July of 1940, the BOAC Horseshoe route flew once a week from Durban to Sydney. After this initial period, the number of flights increased to twice weekly. Panama is a rare destination for Pacific Clipper mail, especially noteworthy from Burma.

Rate : 3 Rupees 15 1/2 Annas

Posted : Jan 15, 1941 at Rangoon

Probable Route : CNAC from Rangoon to Hong Kong; FAM 14 Honolulu Clipper departed Hong Kong on Jan 23, arriving in San Francisco on Jan 29; USA domestic airlines to New York; backstamped New York Jan 30 and 31.

Notes : The BOAC Bangkok to Hong Kong feeder service route flew over French Indo China air space. Due to pressure from the Japanese on the French government, this route was suspended in October of 1940. A new route was needed to connect Hong Kong to the BOAC Horseshoe route. In late October of 1940, the Hong Kong Post Office petitioned to use the China National Aviation Corporation (CNAC) route to connect the BOAC Horseshoe route to Hong Kong and the Pacific Clipper Service. The CNAC route flew from Rangoon, Burma to Chungking, China and then on to Hong Kong and back the same route.

Rate : 8 Rupees 13 Annas. Scarce use of the 5 Rupee India overprinted stamp with new issues of Burma.

Posted : June 24, 1941 at Rangoon

Probable Route : CNAC from Rangoon to Hong Kong; FAM 14 from Hong Kong to San Francisco; USA domestic airlines to New York.

Notes : 7-color franking includes the 5 Rupee high value.

Rate : 12 Rupees 15 Annas

Posted : November 16, 1941 at Shwebo

Route : Domestic surface transport from Shwebo to Rangoon; BOAC Horseshoe Route Flight NE 140 from Rangoon to Singapore; Pan American Airways FAM 14 China Clipper from Singapore to San Francisco; USA domestic airlines to New York; Pan Am FAM 18 Atlantic Clipper to Lisbon; BOAC/KLM to England.

Notes : On Nov 19, 1941 the China Clipper departed San Francisco on what would be it's Last Pre-war Flight. After crossing the International Dateline, the Clipper arrived in Singapore on Nov 29. It departed the next day, Nov 30, for the return trip to the USA, arriving in San Francisco on Dec 6. This two-ocean airmail cover was carried on the this flight, and upon arrival in San Francisco, continued on it's journey to England. Upon arrival in London, the cover was assessed postage due, and a 5p Due stamp was affixed and canceled Dec 17, 1941, confirming that it was on the last flight of the China Clipper.

Rate : 3 Rupees 13 Annas - Short Paid, assessed 5p Postage Due

Posted : November 26, 1941 at Rangoon

Route : BOAC Horseshoe Route Flight NE 140 from Rangoon to Singapore; Pan American Airways FAM 14 China Clipper from Singapore to San Francisco; USA domestic transport to Modesto, CA

Notes : On Nov 19, 1941 the China Clipper departed San Francisco on what would be it's Last Pre-war Flight. After crossing the International Dateline, the Clipper arrived in Singapore on Nov 29. It departed the next day, Nov 30, for the return trip to the USA, arriving in San Francisco on Dec 6. This Registered cover is backstamped San Francisco Dec 6, 1941, verifying that it was carried on this flight. Due to the Japanese attack on Pearl Harbor on Dec 7, and the US entry into World War II, this was the Last Flight of the China Clipper.

Rate : 3 Rupees 15 Annas 3 Pies