Airmail cover franked with 1929 3c deep purple and 1929 15c on 15p black TRAIN issue with 'SERVICIO AEREO 1928' overprint plus 1927 1c olive green TAX issue (SG 230, 241 & 223) all tied by CORREO AEREO INTERNACIONAL GUATEAMALA cancels dated 30 OCT 1931. Addressed to EL SALVADOR with arrival cds on reverse.