Illustrated 'Via Panair' airplane envelope franked with single 1920 1000rs turquoise blue 'Industry' issue (SG 410) tied by SERVICIO AEREO ARACAJU SERGIPE cds dated 21.1.1937. Addressed to RIO DE JANEIRO with good strike of 'Airmail Propaganda Aeropostale' airplane cachet in blue on front and arrival cds on reverse. Highly unusual as this cachet is the same design as the perforated Aeropostale CINDERELLA label issued earlier in the 1930's.