Airmail cover franked with pair 1934 2c bright blue 'AEREO INTERIOR' overprint issue plus 1927 1c olive green TAX issue (SG 279 & 223) tied by LA TINTA cancels dated 18 JUN 1935. Flown on the LA TINTA - GUATEMALA CITY return flight with boxed 'PRIMER VUELO POSTAL LA TINTA A.V. - GUATEMALA' cachet in purple on front. GUATEMALA CITY arrival mark dated the same day on reverse. A scarce flight. (Muller #54 rated 1000pts, Goodman #AM34b)