There are many artifacts from the original air mail routes remaining in Wyoming. Watch Main Street Wyoming’s Cowboys of the Sky, produced in 2013.
It covers the brave aviation pioneers who connected the coasts by flying U.S. Airmail across the country. Pilots like Slim Lewis, James Murray, Hal Colleson, and Jack Knight were among the most notable, braving the rugged skies in Wyoming and across the Rocky Mountain Region.
In addition, 13 arrows and 10 beacons are listed on the DreamSmith Photos site: http://www.dreamsmithphotos.com/arrow/States/wy/wyoming.html