First Flight cover franked with 1929 3c purple, 1930 6c red AIR issue & 1927 1c olive green TAX issue (SG 230, 223 & 254) tied by GUATEMALA CITY cds's dated 9 JUN 1930. Flown on the inaugural flight for the GUATEMALA CITY - ZACAPA domestic route with boxed 'INAUGURACION DEL CORREO AEREO DE GUATEMALA A ZACAPA' cachet in purple originally with a 'PUERTO BARRIOS' handstamp as the destination then with two strikes of large 'ZACAPA' handstamp over the top. Various transit marks and ZACAPA arrival cds on reverse. (Muller #33, Goodman #AM26a)