I had heard of "concrete arrows", https://en.wikipedia.org/wiki/Transcontinental_Airway_System, that were used as navigational aids during the early years of the Transcontinental Airmail Service and found that was located at the airfield in Anthony Kansas. When I arrived at the airport the arrow wasn't readily apparent. The only aircraft on the field was a small helicopter with a two man crew that was going through the checklist prior to take-off. They waved me over and I asked the two young pilots if they knew about the arrow and they had no idea what I was talking about. It seems they were checking power lines in Kansas and were unaware of the old technology. As luck would have it an older gentleman had arrived to see what was going on with the helicopter. It turns out that he ran a cropdusting service and lived right next to the airport and showed me the arrow and the adjacent beacon. He also invited me to his house to meet his wife who knew all about both the beacon and the concrete arrow. After taking a few photos I dropped by and Mary Copenhaver gave me all the details about their arrow. Mrs. Copenhaver and several others had conducted a great deal of research and had collaborated on an article for the Kansas Magazine a few years ago. It seems the Postal Service hired Charles Lindbergh to chart airmail routes from Chicago to the West Coast. He determined locations for lighted beacons with a painted arrows pointing the way to the next beacon and arrow. These routes were to be flown both day and night. Mrs. Copenhaver gave me a copy of their article and a newspaper clipping from August 22, 1929. The article stated that electric power for the beacon light had just been turned on. However, the beacon would not be put into regular service until the runways were completed. There was also some local concern that the light would attract large numbers of insects and could be an issue. Most of the beacons throughout the country were decommisioned in the 1940s for the scrap metal during the war effort. There was also some worry that the beacons could be used by the Japanese or Germans to navigate the USA for bombing missions. Somehow the beacon at Anthony, Kansas escaped that fate and is still in operation. The arrow has seen better days as you can tell from the photos. Anyway, neat history, and nice people in the middle of America!