1948 PHILIPPINE AIR LINES DC-6 INAUGURAL FLIGHT

Postmarked MANILA * PHILIPPINES / JUL 23 P.M. 1948

RP-15: MANILA to LONDON 

No backstamp was applied in London. 
However, a rubber handstamp "Insufficiently addressed, F.B." was applied by the London authorities.
1948 PHILIPPINE AIR LINES DC-6 INAUGURAL FLIGHTS

Postmarked MANILA * PHILIPPINES / DEC 20 A.M. 1947

RP-16: MANILA to BAGUIO
BAGUIO CITY, P.I. / RECEIVED / DEC 21 1948 / PM

RP-17: MANILA to CEBU CITY
CEBU CITY * PHILIPPINES / DEC 21 1948 P.M.

RP-16 Unaddressed cover, receiver on verso