Douglas Aircraft Company was created in 1921.
Douglas Theatre Company was created in 1952.
McDonnell aircraft merged with Douglas aircraft in 1967, forming "McDonnel-Douglas". They remained in business together until the company merged with Boeing in 1997.
Desoutter Aircraft Company was created in 1928.
Central Aircraft Company was created in 1916.
Spartan Aircraft Company was created in 1928.
Comper Aircraft Company was created in 1929.
Verville Aircraft Company was created in 1928.
Stinson Aircraft Company was created in 1920.
Waco Aircraft Company was created in 1919.
CSC Aircraft Company was created in 1924.
Culver Aircraft Company was created in 1939.
Gloster Aircraft Company was created in 1917.