Keywords: 2-cent Aeronautics Conference 1928 U.S. stamp.1.jpg en Wright Brothers first powered flight was celebrated on its 25th anniversary on December 12 1928 with a 2-cent red stamp of the Wright Flyer and a 5-cent blue stamp of a contemporary monoplane The Washington Monument and U S Capitol flank each vignette showing where the Aeronautics Conference was held that year 2014-03-26 15 01 41 Arago people postage the post National Postal Museum online Bureau of Printing and Engraving left 264px PD-USGov Uploaded with UploadWizard Stamps of the United States 1921-1930 Aircraft on stamps of the United States Red stamps U S historical landmarks on stamps |