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 Detroit, Michigan to Cleveland, Ohio and is listed in the Contract Air Mail Flights (CAM) Section of The American Air Mail Catalogue as 6E1.

The 15 cents postage paid for the contract air mail fee and the Cleveland to New York air mail fee.

This route was terminated on July 19, 1928, and superseded by Contract Air Mail Route 27, which was inaugurated July 17, 1928.