First Flight cover franked with 1928 15c on 15p black TRAIN issue with AIR overprint, 1929 3c deep purple and 1927 1c olive green TAX issue (SG 230, 241 & 223) tied by boxed CORREO AEREO INTERNACIONAL 16 MAR GUATEMALA, C.A. cancels. Flown on the GUATEMALA - MANAGUA, NICARAGUA First Flight by PAA with boxed PRIMER ENVIO POSTAL AEREO DE GUATEMALA A CENTRO, SUD - AMERICA Y ANTILLAS 16 DE MARZO DE 1930 'Airplane' cachet in red on front and boxed MANAGUA 'Airmail' arrival mark on reverse dated the same day. 275 covers flown. (Muller #20, Goodman #AM22d)