1929. USA. FIRST FLIGHT US.A. Air Mail ROUTE PAM 9 CANAL ZONE CHILE cancelled MIAMI MAY 14 1929. Beautiful franking with 10 CENTS + 4-block 15 CENTS AIR MAIL. Reverse arrival cancels CHRISTOBAL CANAL ZONE MAY 16 1929 + SANTIAGO CHILE 28 MAY 29. Impressive cover.