This stamp honored the 50th anniversary of the first contract airmail flights from Dearborn, MI, to Cleveland, OH, and from Pasco, WA, to Elko, NV. Also, in 1926, Western Air Express began to fly passengers. Commercial aviation in the United States received a large boost the same year, with the establishment of the Daniel Guggenheim Fund for the Promotion of Aeronautics. The Guggenheim Model Air Line, with its weather-reporting network and radio communications, was the prototype for both airline management and airways development.