Registered cover franked with 1924 2c red, 1929 25c on 35c olive green & rose AIR surcharge issue 1930 50c on 1col violet blue & green AIR surcharge issue with overprint in black (SG 751, 772B & Sanabria #11 only 400 were printed) all tied by boxed 'Correo Aereo' airplane cancels with CORREO AEREO 'Flag' cachet and boxed registration marking. Addressed to HONDURAS with various transit and arrival marks on reverse. Rare stamp on cover.