Costa Rica 1930, Airmail cover franked with 1929 13c on 40c green and strip of 3 1930 20c on 1cor deep lilac 'Airmail' SURCHARGE issue (SG 173 & 178) tied by CORREO AEREO COSTA RICA cds's dated MAR 11 1930. Flown on the San Jose - Panama first flight with boxed first flight cachet on front and boxed 'AGENCIA POSTAL DE PANAMA SERVICIO DE CORREO AEREO PANAMA' boxed first flight cachet applied on arrival on front with PANAMA arrival cds on reverse. Numbered #_____ also on reverse. A rare flight only 255 covers were carried. (Muller #24)