From the Howard Cannon Photograph Collection (PH-00192). Stamped on verso: "Photo by: Ankers Capitol Photographers 316 F Street, N.E. Wash., D.C. 20002 Phone (202)543-2484", possibly members of the Aero Club of Washington, D.C.
Description printed on photograph's accompanying strip of paper: "Howard Hughes' plane heavily guarded leaves hangar at Le Bourget Field, Paris, for the hop to Moscow."