Cover franked with 1928 20c black & orange brown and strip of four 50c black & green 'Presidente' AIR overprint issue (SG 191 & 216) tied by CORREO AEREO ARICA cds's dated 22 JUL 1929 with black on red airmail label alongside. Flown on the Arica - Guayaquil first flight. Addressed to the US Consul in GUAYAQUIL, ECUADOR with arrival cds and consular cachet on reverse. Scarce. (Muller #30)