It carried letters from the Mayor and Postmaster of Petaluma to their counterparts in Santa Rosa. It took two days and one forced landing to cover the approx. 15 mile distance. It featured a pilot's seat taken from a tractor and a "dead man's switch" which was a button on the control wheel which had to remain depressed in order for the engine to run. If the pilot fell out of the plane in a rough landing it would cut the engine. This aircraft is now in the US Postal museum, Washington DC.