By May 17 all but one mail route, CAM 9 (Chicago to Fargo, North DakotaThis route had been last operated by Northwest Airways, Lewis H. Brittin's company. When the three-month temporary contract was awarded, it again went to Northwest, now doing business as Northwest Airlines.), had been restored to civil carriers. AACMO relinquished this last route on June 1, 1934.Shiner (1983), p. 148
