First Flight cover franked with 1931 15c ultramarine 'Primer Vuelo Postal BARRIOS MIAMI 1931' overprint issue, pair 1927 1c olive green TAX issue and 1929 4c orange yellow (SG 266, 223 & 231) Addressed to BELIZE, BRITISH HONDURAS and flown on the PUERTO BARRIOS - BELIZE leg of the flight with stamps tied by large boxed 'VUELO INAUGURAL DE LA RUTA BARRIOS - MIAMI 5 DICIEMBRE 1931' cachet with PUERTO BARRIOS cds alongside dated 5 DIC 1931. BELIZE arrival cds on reverse. A rare flight it is thought that only 45 covers were carried. (Muller #51, Goodman #AM32b)