Balance of Air Post Collection. 1924-51, six Pioneer Flight covers, arranged on album pages, including Around the World Flight of 1924 (1st landing in Boston), US Catapult 1924-51, six Pioneer Flight covers, arranged on album pages, including Around the World Flight of 1924 (1st landing in Boston), US Catapult Flight to Bremen of 1931, Hungarian FFC from Szeged to Budapest of 1932, New York - Rome Flight of 1935 with Notary Public Seal, unused envelope for Amelia Earhart 2nd Take Off Around the World Flight of 1937, air mail cover from Midway Island, HI to Berkley CA of 1941, in addition two stationery postcards with FD cancel, including color error #UXC1a (C.v. $250), occasional conveyance flaws, F/VF, Est. $500-$600 (Image)