Cover franked with single 1931 20c brown AIR issue (SG 380) tied by HABANA machine cancel dated MAR 1 1931. Flown on the Camaguey - Port of Spain, Trinidad first flight by PAA F.A.M. 6 with CAMAGUEY cds dated 2 MAR 1931 on reverse and large boxed 'REPUBLICA DE CUBA ADMON. CORREOS HAVANA SERVICIO AEREO INTERNATIONAL PRIMER VUELO' first flight cachet in blue on front. Addressed to PORT OF SPAIN TRINIDAD with arrival cds dated MR 4 on reverse. Very scarce. (Muller #39, only 68 covers flown)