'Doolittle' First Flight cover franked with 1927 15c red (SG 209) tied by oval LA PAZ cancel dated 22 MAR 1928 with boxed 'CORREO AEREO' in blue and 'First Experimental Flight La Paz - Santiago' SHIELD cachet in purple. Flown on the 2nd leg of the South American Curtis Wright Feasibility Flight by Lt James Doolittle. Addressed to CHILE with arrival cds on reverse. (Muller #14)