Cover with typed 'Por avion via Cuba' at top franked with 1920 25c blue and 1928 35c green (SG 298 & 304) tied by two strikes of PORT-AU-PRINCE cds dated 28 FEB 1928 with circular 'AVION' Airplane cachet in blue alongside. Flown on the Port-au-Prince - Santiago de Cuba first flight by pilot Basil Rowe with three line 'WEST INDIAN AERIAL EXPRESS INAUGURATION REP. DOMINICAINE.. CUBA.. PTO RICO.. HAITI' first flight cachet in blue on front. Addressed to USA with SANTIAGO DE CUBA transit cds on reverse. (Muller #15, 2392 covers carried)