1953 BRITISH OVERSEAS AIRWAYS CORPORATION
LONDON to TOKYO FIRST JET SERVICE
Via Rome - Cairo - Beirut - Bahrain - Karachi - Calcutta - Rangoon - Manila

RP-25F: KARACHI to MANILA
KARACHI R.M.S. / AIR / 4 APR. 53  1 A.M.
AIR MAIL RECEIVED * MANILA, PHILIPPINES / APR 8 A.M. 1953

RP-25G: CALCUTTA to MANILA
CALCUTTA G.P.O. / 4 APR 53
AIR MAIL RECEIVED * MANILA, PHILIPPINES / APR 5 A.M. 1953

RP-25H: RANGOON to MANILA
RANGOON / SORTING / 3.AP.53 4--P.M.
AIR MAIL RECEIVED * MANILA, PHILIPPINES / APR 7 A.M. 1953

RP-25I: TOKYO to MANILA
TOKYO AMF / JAPAN / 5.IV.53 16-18
AIR MAIL RECEIVED * MANILA, PHILIPPINES / APR 8 A.M. 1953
ALL FLIGHTS NOT RECORDED

Note:
There is a strong possibility that a LONDON to MANILA cover exist.