(Deutsche Forschungsanstalt für Segelflug) see also: RRG (Deutsche Flugzeug-Werke G.m.b.H) (DG Flugzeugbau GmbHpreviously Gläser-Dirks) (Dirección General de Reparaciones y Construcciones Navales - Mexico) (Diablo Aircraft Co, Stockton, CA) (Amalio Díaz) (Shirl Dickey Enterprises, Phoenix, AZ) (Francheval, France) (Diehl Aero-Nautical, Jenks, OK) (Bob Diemert) (Dietrich-Gobiet Flugzeugwerke AG - 1922, Richard-Dietrich-Flugzeugbau-GmbH, Dietrich Flugzeugwerke AG, Mannheim) ((Conrad G) Dietz Laboratories, Cincinnati, OH, 1925: Dietz Aeroplane Co, 815 Herman Ave/33 Hess St, Dayton, OH) (Frits Diepens Ford Garage) (Dirección Nacional de Fabricación e Investigación Aeronáutica - Spanish language for "National Directorate of Aeronautical Manufacturing and Research").
(DirectFly sro, Hluk, Czech Republic) (Distar Air) (Charles W Lay, Cincinnati, OH) (Jess Dixon, Andalusia, AL) (Tom Dixon, Burlington, NC) (DJB Aeroplane Co (Harry Deuther, Junkin & Brukner), the basis for Weaver Aircraft Co. ) see:Działowskich (Deutsches Zentrum für Luft- und Raumfahrt e.V.
(DLR) - German Aerospace Center) (Dupperon, Niepce & Fetterer) (Doak Aircraft Co Inc, Torrance, CA ) ((Edward) Doak & (Woody) Deeds Aircraft Co, Culver City, CA) (Jurgis Dobkevičius - Lithuania) (Friedrich Baron von Doblhoff) (Leland Dockery and Ralph Barnecko, Valparaiso, IN) (Howard Doerflein, Milwaukee WI.)
(Aleksnadr Yakovlevich Dokuchayev) (Dornier-Werke AG) (1945: (Glidden S) Doman-(Clinton W) Frasier Helicopters Inc, New York, NY and Stamford, CT, 1949: Doman Helicopters Inc, Danbury, CT 195?
(Dominion Aircraft Corporation Ltd, Renton, WA) (Société des Établissements Donnet-Denhaut) (Georges Dopourdois) (Colonel Émile Dorand, director of the Section Technique de l'Aéronautique (STAé) at Chalais-Meudon / Société d`Études des Giravions Dorand) (Réne Dorand / Société d'Etudes des Giravions Dorand / Société Francaise Du Gyroplane) (L S Dorland, San Francisco, CA) (Etienne Dormoy, Detroit, MI and Dayton, OH) (H F Dorna Company) (Dornier Werke GmbH) (During World War 1, Dornier designed for Zeppelin-Lindau) see FFA (Charles M Ford, Al M Williams, and members of the Douglas Flying Club, Douglas, AZ) see also: Davis-Douglas, McDonnell-Douglas (see #Douglas) (Paskov, Czech Republic) (Robert W Dow, Flint, MI) (C L Downer, Salt Lake City, UT) (Downer Aircraft Industries Inc, Alexandria, MN) (Doyle Aero Corp, 3104 Elm Ave, Baltimore, MD) (Richard H Doyle, Franklin Park, IL) ( (Herbert Charles) Doyle, Rochester, NY) (Doyle-(R M) Brown Motorplane Co, New York, NY) (Doyn Aircraft, Wichita, KS) (Drachen Studio Kecur GmbH, Mettmann, Germany) (Dragon fly Aircraft Corporation) (Ramon Dreifke, St Louis, MO) (Maurice Drezet) (Willard A Driggers, 1530 Olive St, Washington, DC, and Willow Grove, PA) (Driggs Aircraft Corp/Michigan Screw Co, Lansing, MI) ( (Ivan) Driggs-(E A) Johnson Airplane & Supply Co, Dayton, OH) (Lebanon) (Delft Student Aeroclub (DSA)) (Duster Sailplane Kits) (DSK Airmotive, Ft Walton Beach, FL) (Montélimar, France) (Patrick Duane, Liberty, SC) (Aviation Normand Dube, Sainte-Anne-des-Plaines, Quebec, Canada) (Dubna Machine-Building Plant Production Technical Complex Co. Ltd,) (Jean-Marc Ducournau) (Vittorio Ducrot) (Stan Dudek, Somerville, NJ) (Albert Dudek, Cleveland, OH) (Bydgoszcz, Poland) (Dufaux, Armand and Henri, Switzerland) (Ioan Dumbravă) (Dumod Corp, Opa-Locka, FL) (Erwin J Dunham, Hamburg, NY) ((William G) Dunn Mfg Co, Clarinda, IA) (Harry & Frank Dunn, Anderson, IN) (J. W. Dunne) see also: Burgess-Dunne (Marcel Dupau) (Dupont Aerospace) (Roger Dupuy) (William H Durand, 84 St & McKinley Ave) (Claude Durand and Delaville) (Durandeaux) ( (Rex C "Cliff") Durant Aircraft Corp, Durant Field, 82 Ave at E 14 St, Oakland, CA) (Durban Aircraft, South Africa) (René Durenleau, Franklin, VT) (Bill Durley) (Roland Duruble) (Jerzy Dabrowski and Antoni Uszacki) (Duverne & Saran) (George J. Dvorak, Redding, CA) ((Charles F & Edward A) Dycer Airport Corp, 136 St & Western Ave, Los Angeles, CA) (Elmer F Dye, Encanto, CA) (Elmer F Dye & Ed Morrow, Encanto and San Diego, CA) (Stephen E Dyer, Aurora, CO) ((John W) Dyke Aircraft, Fairborn, OH) (Société Dyle et Bacalan à Bordeaux / Société Anonyme de Travaux Dyle et Bacalan) (Dynali Helicopter Company) (Kielce, Poland) (G.M.