D
- DAC, Dutch Aeroplane Company VOF - Netherlands
- Damoure-Fabre, Damoure et Fabre - France
- D'Apuzzo, Nicholas E. D'Apuzzo - United States
- DAR, Darjawna Aeroplanna Rabotilniza - Bulgaria, (Dargeavna Aeroplanna Rabotilnitsa - Country Airplane Factory)
- Darracq, Automobiles Darracq S. A. - France, (Darracq Motor Engineering)
- Dart, Dart Aircraft Company - United States
- Dart Aircraft Limited - United Kingdom
- DASA, Daimler-Benz Aerospace AG - Germany, (1989-2000) > EADS
- DASA, Deutsche Aerospace AG - Germany
- DASA-Rockwell, see DASA and ROCKWELL - Germany/United States
- Dassault, Avions Marcel Dassault - France, (1945-1969) > Dassault-Breguet
- Dassault-Breguet, Avions Marcel Dassault-Bréguet Aviation - France, (1969-1990) > Dassault Aviation
- Dassault, Dassault Aviation (1990-present) - France
- Dassault-Breguet/dornier, see DASSAULT-BREGUET and DORNIER - France/Switzerland
- Dätwyler, MDC Max Dätwyler AG - Switzerland
- Davis, Leeon D. Davis - United States
- Dayton-Wright, Dayton-Wright Airplane Co. - United States, (?-1923) > Consolidated Aircraft
- De Havilland, The De Havilland Aircraft Company Ltd - United Kingdom, (1920-1958) (DH) > Hawker Siddeley
- De Havilland Australia, The De Havilland Aircraft Company Pty Ltd - Australia, (DHA) > Boeing
- De Havilland Canada, Bombardier Aerospace De Havilland - Canada, (1928-1989) (DHC) > Bombardier Aerospace
- De Havilland Canada, De Havilland Division of Boeing of Canada Ltd - Canada
- De Havilland Canada, De Havilland Inc - Canada
- De Havilland Canada, The De Havilland Aircraft of Canada Ltd - Canada
- De Schelde, Koninklijke Maatschappij De Schelde - Netherlands
- Deborde-Rolland, Yves Deborde et Jean-Louis Rolland - France
- Delisle, Club Aeronautique Delisle Inc - Canada
- Denel Aerospace Systems, Denel Aerospace Systems, Denel Aviation - South Africa
- Denize, Robert Denize - France
- Denney, Denney Aerocraft Company - United States
- Department of Aircraft Production, Australian government, Australia, (1939-1941) later known as Government Aircraft Factory
- Derazona, PT Derazona Aviation Industry - Indonesia
- Derringer, Derringer Aircraft Company LLC - United States
- Detroit Aircraft Corporation, Detroit Aircraft Corporation - United States, (July 10, 1922-October 27, 1931)
- Deutsche Airbus, Deutsche Airbus GmbH - Germany
- DFS, Deutsche Forschungsanstalt für Segelflug - Germany, (1925-1945) (Deutsches Forschungsinstitut fur Segelflug - German Research Institute for Sailplane Flight)
- Dewoitine, Constructions Aéronautiques Emile Dewoitine - France
- Dewoitine, Société Aéronautique Française, Avions Dewoitine - France
- DF Helicopters, DF Helicopters SRL - Italy
- DFW, Deutsche Flugzeugwerke - Germany
- DG Flugzeugbau, DG Flugzeugbau GmbH - Germany
- Diamond, Diamond Aircraft Industries GmbH - Austria
- Diamond, Diamond Aircraft Industries Inc - Canada
- Dickey, Shirl Dickey Enterprises - United States
- Dijkman-Dulkes, Cor Dijkman-Dulkes - Netherlands
- DINFIA, Dirección Nacional de Investigaciones y Fabricaciones Aeronáuticas - Argentina, (1957-?)
- DKBA FGUP, Federal Unitary State Enterprise, "Dolgoprudniy Design
Bureau of Automatics" ("DIRIZHABLESTROI USSR ENTERPRISE" in 1932-1940) - key state Russian manufacturer of airships, balloons, aerostats, blimps. - Russian Federation
- Dirgantara, PT Dirgantara Indonesia - Indonesia
- DM Aerospace, DM Aerospace Ltd - United Kingdom
- Doak, Doak Aircraft Company - United States
- Donnet - France
- Donnet-Denhaut - France
- Dorna, H F Dorna Company - Iran
- Dornier, AG für Dornier-Flugzeuge - Switzerland
- Dornier, Dornier GmbH - Germany, (?-1959) > FUS
- Dornier, Dornier Luftfahrt GmbH - Germany, (?-1989) > DASA
- Dornier, Dornier-Werke GmbH - Germany
- Douglas, Douglas Aircraft Company Inc - United States, (1920-1967) > McDonnell-Douglas
- Downer, Downer Aircraft Industries Inc - United States
- Dragon Fly, Dragon Fly Srl - Italy
- Dream, Dream Aircraft Inc - Canada
- Driggs, Driggs Aircraft Corporation - United States
- Druine, Avions Roger Druine - France
- DSK, DSK Aircraft - United States
- DSK Airmotive, DSK Airmotive - United States
- Dubna, Proizvodstvenno-Tekhnichesky Kompleks Dubnenskogo Mashinostroitelnogo Zavod AO - Russia
- Dufaux, Armand and Henri Dufaux - Switzerland
- Duigan, John Duigan - Australia
- Dumod, Dumod Corp. - United States
- Durand, William H. Durand - United States
- Duruble, Roland Duruble - France
- du Temple, Félix du Temple - France
- Dyke, John W. Dyke - United States
- Dyn'aero, Société Dyn'Aero - France
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