Cover franked with 1924 50c black & orange (SG 302) tied by CAP HAITIEN cds dated 19 APR 1926 with second strike alongside and also by two strikes of the 'AVION' airplane cachet in black. Flown on the Cap Haitien - Port-au-Prince first flight by the U.S Marine corp. Addressed to PORT AU PRINCE with arrival cds on reverse. (Muller #Unlisted, but listed in Haiti's First Flights by B Levine)