Cover franked with 1929 50c violet AIR issue (SG 307) tied by PORT AU PRINCE cancel dated 7 MAR 1930 with large circular 'PREMIER VOL N.Y.R.B.A.' cachet in blue on front. Flown on the Port-au-Prince - Georgetown, British Guiana flight by pilot W S Grooch. Addressed to BRITISH GUIANA with arrival cds on reverse. Uncommon. (Muller #48)