sentences:  The Detroit corporation owned the entire capital stock of the Ryan Aircraft Corp., Aircraft Development Corp., Aviation Tool Co., Grosse Ile Airport, Inc., Marine Aircraft Corp., Park's Air College and Affiliated Companies, Detroit Aircraft Export Co., Gliders, Inc., and Eastman Aircraft Corp.It also owned a 90% interest in the Blackburn Aeroplane and Motor Company, practically all of the capital stock of the Lockheed Aircraft Company and a 40% interest in Winton Aviation Engine Co. During the Great Depression the Detroit Aircraft holding company found that rising losses from other operations were draining the company coffers.On October 27, 1931, the Detroit Aircraft Corporation went into receivership.