1941 Belgian Congo, Airmail cover, The first flight from Belgian Congo to the United States of America via Brazil, Leopoldville - Natal - Norristown, franked by Mi. 2x 175, 200 (Image)

1929 (10 Feb) Canal Zone, Airmail cover from Cristobal to New York via Miami, 1st flight Canal Zone - USA (Image)

1929 Canal Zone, United States, First Flight Canal Zone to Nicaragua - Honduras - Cuba, Airmail cover, Cristobal - Managua, franked by Mi. 80 (Image)

1929 Canal Zone, United States, First Flight Canal Zone to Peru, Airmail cover, Cristobal - Mollendon, franked by Mi. 2x 80 (Image)

1940 New Zealand - USA Flight via New Caledonia, Canton and Hawaii, Airmail cover, Auckland - New York, franked by Mi. 197, 202 (Image)

1928 United States, Airmail cover, Springfield - Canton, franked by Mi. 5x 303 (Image)

1929 United States, National Air Races, Airmail cover with Pilot Signature, Clevland - Buffalo (Image)

1928 United States, First Flight New York - Montreal, Airmail cover, franked by Mi. 310 (Image)

1928 United States, Airmail cover, Chicago - Sant Louis, franked by Mi. 2x 300 (Image)

1928 (11 May) United States, Airmail Registered cover from Milwaukee to Munich (Germany) via New York, Special flight Milwaukee - Chicago with red airmail handstamp (Image)

1929 United States, First Flight San Juan - Paramaribo, Airmail cover, Miami - Georgetown (British Guiana) franked by Mi. 279, 2x 300 (Image)

1929 United States, First Sunday Flight Miami - Atlanta, Airmail cover, franked by Mi. 310 (Image)

1930 United States, Airmail cover, Watertown - Oklahoma, franked by Mi. 321 (Image)

1931 United States, Airmail cover, Decatur - Brooklyn, franked by Mi. 321 (Image)

1933 (24 Jun) United States, Airmail by Catapult cover from New York to Kiel (Germany) via Bremen with special Bremen handstamp and red airmail handstamp (Image)

1934 (27 Jun) United States, Airmail cover from Bridgeport to Hannover (Germany) via Paris, flight on S.S. Bremen with red airmail handstamp (Image)

1934 (1 Oct) United States, Airmail cover from Elmira to Chicago, 1st flight Elmira - New York (Image)

1934 (1 Oct) United States, Airmail cover from Scranton to New York, 1st flight (Image)

1939 (20 May) United States, Airmail cover from New York to Germany via Marseille, 1st Trans-Atlantic flight Fam 18 (Image)

1935 United States, First Flight Airmail cover, San Francisco - Daytona Beach, franked by Mi. 3x 380 (Image)

1937 United States, First Flight to Asia, Airmail cover, Honolulu - Hong Kong - Portland, franked by Mi. 401 (Image)

1937 United States, Trans-Pacific Airmail cover, San Francisco - Honolulu - St. Luis, franked by Mi. 400 (Image)

1937 United States, Trans-Pacific Airmail cover, San Francisco - Manila - St. Luis, franked by Mi. 401 (Image)

1937 United States, First Flight to Asia Guam - Hong Kong, Airmail cover, Guam - Hong Kong - Portland, franked by Mi. 300, 400 (Image)

1937 United States, First Flight Trans-Pacific, Airmail cover, San Francisco - Guam - Sant Louis, franked by Mi. 2x 400 (Image)