1925 FIRST INTER-ISLAND AIRMAIL SERVICE
50th ANNIVERSARY FLIGHTS
MANILA to TWELVE DIFFERENT PHILIPPINE CITIES

Flown on different dates with commemorative covers
all postmarked MANILA / PHILIPPINES / DEC 1 1975


RP-78: MANILA to CAGAYAN DE ORO CITY
CAGAYAN DE ORO CITY / PHILIPPINES / RECEIVED / DEC 4 1975

RP-79: MANILA to CEBU CITY
CEBU CITY / PHILIPPINES / RECEIVED / DEC 3 1975

RP-80: MANILA to ILOILO CITY
ILOILO CITY (REGIONAL CENTER) * PHILIPPINES / DEC 3 1975

RP-81: MANILA to KALIBO, AKLAN
KALIBO, AKLAN * PHILIPPINES / RECEIVED / DEC 4 1975

RP-82: MANILA to MARAWI CITY
MARAWI CITY * PHILIPPINES / RECEIVED / DEC 8 1975

RP-83: MANILA to MASBATE, MASBATE
MASBATE, MASBATE * PHILIPPINES / RECEIVED / DEC 3 1975