Keywords: First transcontinental flight cover from Boeing Field.jpg en The first transcontinental flight cover from Boeing Field 1929 On display at the passenger terminal of Boeing Field I took a photo then did some manipulation with GIMP to get it neatly rectilinear and to crop out possibly copyrighted museum text Photo by Joe Mabel Cover 1929 Photo 2010-04-06 Joe Mabel Photo GFDL CC-BY-SA-3 0 granted by photographer<br /> U S postage stamps from that era are public domain The envelope etc are probably PD-ineligible but if not would have had to have a copyright notice to be copyrighted at that time and don't PD-USGov Boeing Field Stamps of the United States 1921-1930 Postal covers of the United States First flight covers |