Registered cover franked with 1930 15c scarlet and 20c green AIR issue (SG 775/776) tied by two different SAN SALVADOR cds's dated JUL 1 1931 with large boxed registration marking alongside. Flown on the San Salvador - St. John's, Antigua first flight with boxed 'PRIMER CORREO AEREO EL SALVADOR A ANTIGUA (B.W.I.) 1o JULIO DE 1931 SAN SALVADOR C.A.' cachet in red on front. Addressed to ST. JOHN'S with transit and arrival marks on reverse. A scarce flight. (Muller #40, rated 1000pts)