Contract Air Mail Routes 6 and 7 were the first U.S. domestic air mail routes to be flown under private contract, both routes being inaugurated on February 15, 1926. W. Irving Glover, Second Assistant Postmaster General in charge of Air Mail Service, came from Washington, DC to present the first air mail pouch to Henry Ford for dispatch aboard the plane.

Initial service along this 155-mile route was one daily trip each way, except Sunday.

This cover was carried on the inaugural Contract Air Mail Route 6 flight from Cleveland, Ohio to Detroit, Michigan (where it was backstamped) and is listed in the Contract Air Mail Flights (CAM) Section of The American Air Mail Catalogue as 6W3.

This route was terminated on July 19, 1928, and superseded by Contract Air Mail Route 27, which was inaugurated July 17, 1928.