A
- AAA, Advanced Amphibious Aircraft – Germany/Italy, (1988–1994)
- AAC, Amphibian Airplanes of Canada – Canada, (1998–?)
- AAC, Advanced Aircraft Corporation – United States, (1983–?)
- Aachen Flugzeugbau – Germany, (1914–?)
- AAI, Aviation Association Ilyushin – Russia, (1992–present)
- AAMSA, Aeronautica Agrícola Mexicana SA – Mexico, (1971–1984)
- AASI, Advanced Aerodynamics and Structures Inc – United States, (1989–2002) > Mooney Aerospace Group
- AB Flygindustri (1), Malmö, Sweden, (1921–1935)
- AB Flygindustri (2), Halmstad, Sweden, (1937–?)
- ABHCO, Arab British Helicopter Company – Egypt
- Abrams, Abrams Air Craft Corporation – United States, (1937-1940)
- ABS Aerolight, Sérignan-du-Comtat, France
- ABS, ABS Aircraft – Germany, (1985–?)
- ABS, ABS Aircraft AG – Switzerland, (1985–?)
- AC Mobil 34, AC Mobil 34 – France
- ACAC, AVIC I Commercial Aircraft Company Ltd – Republic of China
- ACAZ, Ateliers de Construction Aéronautique de Zeebrugge – Belgium, (1923–1933)
- ACBA, Aéro Club de Bas Armagnac – France
- Ace, Ace Aircraft Manufacturing and Supply – United States
- Ace, Ace Aircraft Manufacturing Company – United States, (1929–1931) > Corben Aircraft Company
- Ace, Ace Aircraft Manufacturing Inc – United States
- Aceair, Aceair SA – Switzerland, (1999-2005)
- Aces High, Aces High Light Aircraft Ltd – Canada
- Acme (1), Acme Aircraft Company – United States, (?–1953) > Sierradyne
- Acme (2), Acme Aircraft Corporation – United States, (1928–1931)
- ACME, Air Craft Marine Engineering – United States, (1954–?)
- ACS, Advanced Composites Solutions – United States (2006-present)
- Acro Sport, Acro Sport Inc – United States, (1977–2014)
- ACT, Aviation Composite Technology – Philippines, (1990–?)
- AD Aerospace, AD Aerospace Ltd – United Kingdom
- ADA, Aeronautical Development Agency – India, (1984–present)
- Adam (1), Roger Adam – France, (1948–1955)
- Adam (2), Adam Aircraft Industries LLC – United States, (1998–2008)
- Adamoli-Cattani, Adamoli-Cattani – Italy
- Adams, Adams Industries Inc – United States
- Adams Aero, Adams Aeronautics Company – United States
- Adams-Wilson, Adams-Wilson Helicopters Inc – United States
- Adaro, Adaro – Spain
- ADC Aircraft, Aircraft Disposals Company – United Kingdom, (1920–1930)
- Adcox, Adcox Aviation Trade School – United States
- Adkisson, Earl and Jerry Adkisson – United States
- Ader, Clement, France, (1886–1897)
- Adler, Adler (Adlerwerke vorm Heinrich Kleyer) – Germany, (1934–?)
- Admiralty, British Admiralty Air Department (AD) – United Kingdom
- Advance, Advance Aircraft Company – United States, (1923–1928) > Waco Aircraft Company
- Advance Thun, Thun, Switzerland
- Advanced Aeromarine – United States > Keuthan Aircraft
- Advanced Aviation, Advanced Aviation Inc – United States
- Advanced Soaring Concepts, Advanced Soaring Concepts – United States
- Adventure Air – United States
- Adventure SA, Méré, Yonne, France
- A-DY, Antonov–Dniepropetrovsk Yuzhmash – Ukraine, (1991–?)
- AEA, Aeronautical Engineers Australia Research Pty Ltd – Australia, (1978–present)
- AEA, Aerial Experiment Association – Canada/United States, (1907–1909) > Curtiss Aeroplane and Motor Corp.
- AEC, Aircraft Engineering Corp – United States
- AEG, Allgemeine Elektrizitäts-Gesellschaft – Germany, (1910–1918) (General Electricity Company)
- AEKKEA-RAAB, AEKKEA – Greece (1935–1940)
- AER, Aer Aircraft Corp. – United States
- Aer Lualdi, Aer Lualdi & C SpA – Italy
- Aer Pegaso, Aer Pegaso – Argentina
- Aerauto, Aerauto – Italy, (1950–1953)
- Aereon, Aereon – United States, (1967–?)
- Aerfer, Aerfer-Industrie Aerospaziali Meridionali SpA – Italy, (1955–1969) > Aeritalia
- Aerfer, Aerfer-Industrie Meccaniche Aeronautiche Meridionali SpA – Italy
- Aerfer-Aermacchi, see Aerfer and Aermacchi – Italy
- Aerial Distributors, Aerial Distributors – United States, (1967–?)
- Aerial Service Corporation, Aerial Service Corporation – United States, (1920–?) > Mercury Aircraft
- Aériane, Aériane – Belgium
- Aerion, Aerion Corporation – United States, (2002–?)
- Aeritalia, Aeritalia-Società Aerospaziale Italiana pA – Italy, (1969–1981) > Alenia Aeronautica
- Aeritalia-Aermacchi, see Aeritalia and Aermacchi – Italy
- Aermacchi, Aermacchi SpA – Italy, (1913–present)
- Aermacchi, Aeronautica Macchi SpA – Italy
- Aermatica, Aermatica Spa – Italy, (2008–present)
- Aero (1), Aero Design and Engineering Company – United States, (1944–1960) > Rockwell
- Aero (2), Aero Vodochody AS – Czech Republic, (1994–present)
- Aero (2), Aero Vodochody Národní Podnik – Czechoslovakia > Czech Republic, (1953–1994)
- Aero (2), Aero Továrna Létadel – Czechoslovakia, (1919–1953)
- Aero (3), Aero Sp.z o.o. – Poland
- Aero Adventure, Aero Adventure Inc – United States
- A.E.R.O. Aircraft Services, LLC, United States – manufacturer of Lake amphibian aircraft
- Aero Boero, Aero Boero SA – Argentina, (1959–present)
- Aero Boero, Aero Boero SRL – Argentina
- Aero Boero, Aero Talleres Boero SRL – Argentina
- Aero Commander, Aero Commander Inc – United States
- Aero Composites, Aero Composites – United States
- Aero Designs, Aero Designs Inc – United States
- Aerodyne Technologies, Talloires, France
- Aero East Europe, Kraljevo, Serbia
- Aero Gare – United States
- Aero Jaen, Aeronautica de Jaen – Spain
- Aero Kuhlmann – France
- Aero Mercantil, Aero Mercantil SA – Colombia, (1952-1991) > Gavilán
- Aero Mirage, Aero Mirage Inc – United States
- Aero Mod, Aero Mod General – United States
- Aero Nord, Lorgies, and later Bénifontaine, France
- Aero Resources – United States
- Aero Services, Aéro Services Guépard – France
- Aero Spacelines, Aero Spacelines Inc – United States, (1961–1974) > Tracor
- Aeroalcool, Aeroálcool Tecnologia Ltda – Brazil
- AeroAndina, Aerotechnologias Andinas SA – Colombia, (2002–?)
- Aero-Astra, Aviatsionnyi Nauchno-Tekhnicheskiy Tsentr Aero-Astra – Russia
- Aerobravo, Aerobravo Industria Aeronautica Ltda – Brazil, (1993–present)
- AeroCad, AeroCad Inc – United States
- Aero-Cam, Aero-Cam Pty Ltd – South Africa
- Aerocar, Aerocar Inc – United States
- Aerocar International, Aerocar International – United States, (1948–1961)
- Aérocentre, Société Nationale de Constructions Aéronautiques du Centre – France, (SNCAC)
- Aerochute International, Coburg North, Victoria, Australia
- Aero-Club, Aero-Club der Schweiz – Switzerland
- Aerocomp, Aerocomp Inc – United States
- Aero-Composites, Aero-Composites Technologies Inc – United States
- Aero-Craft, Aero-Craft – Unknown
- Aero-Difusión, Aero-Difusión SL – Spain, (1955–?)
- Aérodis, Aérodis SARL – France
- Aerodynos, Aerodynos de Colombia SA – Colombia
- Aero-Flight, Aero-Flight – United States
- Aerojames, Aérojames SARL – France, (2004–?)
- Aero-Jodel, Aero Flugzeugbau Hubert Zuerl – Germany
- Aerokopter, OOO Aerokopter – Ukraine, (1999–?)
- Aerolab, Aerolab Srl – Italy, (2001–?)
- AeroLites, Aerolites Inc – United States
- Aeromarine, Aeromarine Plane and Motor Co. – United States, (1908–1935) (Prior to 1914 was the Boland Aeroplane and Motor Co.) > Burnelli
- Aeromarine-LSA, South Lakeland Airport, Florida, United States
- Aeromere, Aeromere SpA – Italy, (1957–1964) > Laverda
- Aeromot, Aeromot Industria Mecanico-Metalurgica Ltda – Brazil
- Aeromot, Aeronaves e Motores SA – Brazil
- Aeronautical Engineering, Aeronautical Engineering Company – United States
- Aeroneering – United States
- Aeronca, Aeronautical Corporation of America – United States, (1928–1951)
- Aeronca, Aeronca Manufacturing Corporation – United States
- Aeronix, Aéronix SARL – France, (1999–?)
- Aeroplastika – Lithuania
- Aeropract (1), Aeropract JSC – Soviet Union > Russia, (1974–present)
- Aeropract (2), KB Aeropract – Russia, (1993–present)
- Aeropract (3), LM Aeropract Samara – Russia/Finland, (1991–?)
- Aeroprakt, Aeroprakt JSC – Soviet Union > Ukraine, (1986–present)
- Aeropro, Aeropro s.r.o – Slovakia
- Aeroprogress, Aeroprogress Corporation – Russia
- Aeroprogress/ROKS-Aero – Russia, (1990–?)
- Aeroric, Aeroric Nauchno-Proizvodstvennoye Predpriyatie OOO – Russia
- Aero-Service Jacek Skopiński, Warsaw, Poland
- Aeros, Aeros s.r.o – Czech Republic
- AeroSamara – Russia
- AeroSette, AeroSette s.r.o – Czech Republic
- Aerospace General – United States
- Aerospace Manufacturing Inc – United States
- Aérospatiale, Société Nationale Industrielle Aerospatiale – France, (1970–1999) (SONACA) > Aérospatiale-Matra
- Aérospatiale-Matra, Aérospatiale-Matra – France, (1999–2000) > EADS
- Aerospool, Aerospool spol. s.r.o – Slovakia
- Aerosport, Aerosport Inc – United States
- Aerosport OY, Keila, Estonia
- Aerostar (1), SC Aerostar SA – Romania, (1953–present)
- Aerostar (2), Aerostar Aircraft Corporation LLC – United States, (1991–present)
- Aerostatica, Aerostatica Scientific-Production Company – Russia
- Aerostructure, Aérostructure SARL – France
- Aerostyle, Aerostyle GmbH – Germany
- Aerosud, Aerosud – South Africa
- Aerotaller, Aerotaller – Argentina
- Aerotec (1), Aerotec SA Industria Aeronáutica – Brazil, (1962–1987)
- Aerotec (2), Aerotec - Tecnologías Aeronauticas SA – Colombia, (1998–2002) > AeroAndina
- Aerotechnik, Aerotechnik CZ s.r.o – Czech Republic
- Aerotécnica – Spain
- Aerotek (1), Aerotek Inc – United States
- Aerotek (2), Aeronautical Systems Technology – South Africa
- Aero-Volga, NPO Aero-Volga – Russia
- AESL, Aero Engine Services Ltd – New Zealand, (1954–1973) > Aerospace
- AFG, Allgemeine Flug-Gesellschaft – Lithuania, (1925–?)
- AFIC, AFIC Pty Ltd – South Africa, (1967–?)
- AFU – Switzerland, (1959–?)
- Ag-Cat, Ag-Cat Corporation – United States
- AGO, Ago Flugzeugwerke – Germany, (1911-1945)
- Agrocopteros, Agrocopteros Ltda – Colombia (1971-1998) > Aerotec > AeroAndina
- Agrolot, Fundacja Agrolot – Poland
- Agrolot, Wyposazen Agrolotniczych – Poland
- Agusta, Agusta SpA – Italy, (1907–present)
- Agusta, AgustaWestland SpA – Italy, (2000-2016) > Agusta, Division of Leonardo
- Agusta, Costruzioni Aeronautiche Giovanni Agusta SpA – Italy
- AgustaWestland, AgustaWestland Company – International, (2000-2016)
- AHA, Advanced Hybrid Aircraft Inc – United States
- Ahrens, Ahrens Aircraft Corp. – United States (1975–?)
- AI(R), Aero International (Regional) – UK/France/Italy
- AIAA, Atelier Industriel de l'Aéronautique d'Alger – Algeria, (1948–1960)
- Aichi Kokuki, Aichi Kokuki KK – Japan, (1931–1945) (Aichi Aircraft Company)
- AICSA, Aero Industrial Colombiana SA – Colombia
- AIDC, Aero Industry Development Center – Republic of China (Taiwan)
- AIDC, Aerospace Industrial Development Corporation – Republic of China (Taiwan)
- AIEP, Aeronautical Industrial Engineering and Project Management Company Ltd – Nigeria
- AII, Aviation Industries of Iran – Iran, (1993–present)
- AIL, Aeronautics (India) Ltd – India
- AIM, Aerospace Industries of Malaysia – Malaysia, (1985–?)
- AIR, Aircraft Investor Resources LLC – United States
- Air & Space, Air & Space America Inc – United States
- Air & Space, Air & Space Manufacturing Inc – United States
- Air Command, Air Command International Inc – United States
- Air Parts, Air Parts (NZ) Ltd – New Zealand
- Air Products, Air Products Company Inc – United States
- Air Tractor, Air Tractor Inc – United States, (1972–present)
- Airbridge – Moscow, Russia
- Airbus, Airbus SAS – European Union, (1970–present)
- Airbus, Airbus Military SAS – European Union
- Airbus, GIE Airbus Industrie – European Union
- Airco, Aircraft Manufacturing Company – United Kingdom, (1912–1920) > de Havilland
- Airconcept, Airconcept Flugzeug und Gerätebau GmbH und Co KG – Germany
- Aircraft Armaments Incorporated (AAI) (US) – founded 1950, renamed to AAI Corporation 1985
- Aircraft Cooperative, Aircraft Cooperative – United States
- Aircraft Designs, Aircraft Designs Inc (ADI) – United States, (1986–present)
- Aircraft Hydro-Forming, Aircraft Hydro-Forming Inc – United States
- Aircraft Industries, Aircraft Industries AS – Czech Republic
- Aircraft Parts, Aircraft Parts and Development Corporation – United States
- Aircraft Spruce, Aircraft Spruce & Specialty Company – United States
- Aircraft Technologies, Aircraft Technologies Inc – United States
- Airdale, Airdale Flyer Company – United States, (1999-2017)
- Airfer, (Airfer Paramotores, Paramotores Air-Future, S.L.), Pontevedra, Spain
- Air-Fouga, Air-Fouga – France, (1956-1958)
- Airframes, Airframes Inc – United States
- Airframes-Dakota Cub, see Airframes and Dakota Cub
- Airframes Unlimited, Athens, Texas, United States
- Air-Light, Air-Light GmbH – Germany
- AirLony, AirLony Aircraft Company – Czech Republic
- Airmak, Capua, Italy
- Airmaster, Airmaster Inc – United States
- AirMax, AirMax Construções Aeronáuticas Ltda – Brazil, (1997-2017) > SeaMax
- Airo Aviation – United Arab Emirates, (2006-2019)
- Airplan, Airplan – France
- Airplane Factory, The, Tedderfield Airpark, Eikenhof, Johannesburg South, South Africa
- Air Plum, Fourilles, France
- Airspeed, Airspeed Ltd – United Kingdom, (1931–1951) > de Havilland
- Air-Sport, Zakopane, Poland
- Airsport, Airsport s.r.o – Czech Republic
- Air Sylphe, Villereau, Nord, France
- Airtech (1), Airtech Canada Aviation Services Ltd – Canada
- Airtech (2), Aircraft Technology Industries – Indonesia/Spain
- Airtime Products, Airlie Beach, Queensland, Australia
- Airwave Gliders, Fulpmes, Austria
- Airways International, United States
- AIS, Aviatsionnaya Ispitatelnaya Stantsiya – Russia, (1916-?)
- AISA, Aeronautica Industrial SA – Spain, (1923–1995)
- AJEP, AJEP Developments – United Kingdom
- AJI, American Jet Industries Inc – United States
- Akaflieg Berlin, Akademische Fliegergruppe Berlin eV – Germany
- Akaflieg Braunschweig, Akaflieg Braunschweig – Germany
- Akaflieg Darmstadt, Akademische Fliegergruppe Darmstadt eV – Germany
- Akaflieg Hannover, Akaflieg Hannover – Germany
- Akaflieg Karlsruhe, Akademische Fliegergruppe Karlsruhe eV – Germany
- Akaflieg Munchen, Akademische Fliegergruppe München eV – Germany
- Akaflieg Stuttgart, Akaflieg Stuttgart – Germany
- Akron, Akron Aircraft Company Inc – United States
- Akrotech, Akrotech Aviation Inc – United States
- Akrotech Europe, Akrotech Europe SA – France
- Alanne, Pentti Alanne – Finland
- Alaparma – Italy, (1945–?)
- Albastar Ltd, Zgornje Gorje, Slovenia
- Albatros, Fabrika aviona Albatros – Yugoslavia
- Albatros Flugzeugwerke, Albatros Flugzeugwerke GmbH – Germany, (1909–1931) > Focke-Wulf
- Albatros-Flugzeugwerke, Ostdeutsche Albatros Werke – Germany, (East German Albatros Works)
- Albatross, Albatross Scientific-Technical Works – Russia, (1990-present)
- Albaviation, Corropoli, Italy
- Albert, Avions Albert – France, (1926–?)
- Alenia, Alenia – Italy, (1981–present)
- Alenia, Alenia Aerospazio, Division of Leonardo – Italy
- Alexander, Alexander Aircraft Company – United States (1925–1931)
- Alfa-M, Alfa-M Nauchno-Proizvodstvennoye Predpriyatie AOOT – Russia
- Alisport, Alisport – Italy
- All American – US
- Alliance Aeroplane Company, Alliance Aeroplane Company Ltd, United Kingdom
- Alliant Aviation, Richland, Michigan, United States
- Alliant Techsystems, Alliant Techsystems – United States
- Allied Aerospace Industries – United States, (?-present)
- Allied Aviation – United States
- Allison, Allison Gas Turbine Division GMC – United States
- Alon, Alon Inc – United States, (1964–1967) > Mooney
- Alpavia, Alpavia SA – France, (1959–1966) > Sportavia-Putzer
- Alpha (1), Alpha – Poland
- Alpha (2), Alpha Aviation – United States, (1971–?)
- Alpha (3), Alpha Aviation Ltd – New Zealand, (2003–present)
- Alpi, Alpi Aviation Srl – Italy
- Alpla, Alpla-Werke Alwin Lechner OHG – Austria
- Altair Coelho, Eldorado do Sul, Brazil
- AltiGator, Amphios SPRL - Belgium, (2008–present)
- Alturair, Alturair – United States
- Alvarez, Joseph P. Alvarez – United States
- Amax, Amax Engineering – Australia
- Ambrosini, Societa Aeronautica Italiana Ing. A. Ambrosini & Companie – Italy, (1934–1958)
- Amc, Aircraft Manufacturing Company – United States, (1917–1920)
- Amd, Aircraft Manufacturing and Development Company Inc – United States
- Ameagle, AmEagle Corporation – United States
- American Aerolights, United States
- American, American Aviation Corporation – United States
- American Affordable, American Affordable Aircraft – United States, (AAA)
- American Aircraft, American Aircraft Inc – United States
- American Airmotive – United States
- Ameri-Cana Ultralights – Canada
- American Autogyro, American Autogyro Inc – United States
- American Champion, American Champion Aircraft Corporation – United States
- American Eagle, American Eagle Aircraft Corporation – United States, (1925–1932)
- American General, American General Aircraft Company – United States
- American Homebuilts, Hebron, Illinois, United States
- American Sportscopter, American Sportscopter Inc – United States
- American Utilicraft, American Utilicraft Corporation – United States
- Ameur Aviation SA (or simply "Ameur") – France
- Ameur Aviation Technologie (or simply "Ameur") – France
- Amiot, Amiot – France, (1915–1945) (Amiot-Peneau) > Ateliers Aeronautiques de Colombes, SNCAC
- Amoy, Amoy – Unknown, (1930–1935)
- AMS-Flight, AMS-Flight DOO – Slovenia
- AMX, AMX International Ltd – Italy/Brazil
- Anahuac, Fabrica de Aviones Anahuac SA – Mexico
- Anatra – Russia, (1913–1922)
- ANBO, Antanas Gustaitis at the Lithuanian Army Aviation Workshops – Lithuania, (1927–1939)
- Anderson, Anderson Aircraft Corporation – United States
- Anderson, Earl Anderson – United States
- Anderson-Greenwood, Anderson, Greenwood and Company – United States
- Andreasson, Björn Andreasson – Sweden
- ANF Mureaux – France, (1918–1937) > SNCAN
- Angel, Angel Aircraft Corporation – United States
- Anglin, Anglin Engineering – United States
- Anglin, Anglin Special Aero Planes Inc – United States
- Anglo Normandy, Anglo Normandy Aero Engineering – United Kingdom
- ANG Patriot Ukraine LLC, Brovary, Kyiv region, Ukraine > Аircraft New Generation Patriot UA (angpatriotua.com)
- Ansaldo – Italy, (1916–1925)
- Antoinette, Antoinette – France, (1900–1911)
- Antoniewski, Tomek Antoniewski – Poland
- Antonov, Antonov OKB – Soviet Union > Ukraine, (1947–present)
- Antonov, Aviatsionny Nauchno-Tekhnichesky Kompleks Imeni O.K. Antonova – Ukraine, (before 2010)
- AOI, Arab Organisation for Industrialisation, Aircraft Factory – Egypt, (1975–?)
- Apco Aviation, Caesarea, Israel
- Apex Aircraft – France
- Apollo Ultralight Aircraft, Eger, Hungary
- Applebay Sailplanes, Albuquerque, New Mexico, United States
- Applegate & Weyant, Applegate & Weyant – United States
- Aquila, Aquila Technische Entwicklungen GmbH – Germany
- Arado, Arado Flugzeugwerke GmbH – Germany, (1925–1945)
- Arc Atlantique, Arc Atlantique Aviation – France
- Arctic, Arctic Aircraft Company – United States
- Arey, Krasnoyarsk, Russia
- ARDC, Air Force Research and Development Center – Philippines
- Arkhangelski, Arkhangelski OKB – Soviet Union (1937–1942) > Tupolev
- Armstrong Whitworth, Sir W. G. Armstrong Whitworth Aircraft Ltd – United Kingdom, (1913–1958) > Hawker Siddeley
- Arnet Pereyra, Arnet Pereyra Aero Design – United States
- Arocet – United States
- Arpin, M. B. Arpin & Co. – United Kingdom
- Arrow (1), Arrow Airplane & Motors Corporation – United States
- Arrow (2), Arrow Aircraft Company – Canada
- Arrow Aircraft, Arrow Airplane Company – United States, (1931–1935)
- Arrow Aircraft Ltd. – United Kingdom
- Arsenal de l'Aeronautique, Arsenal de l'Aeronautique – France, (1936–1953) > SFECMAS
- Arsenyev, Arsenyev Aviation Production Enterprise ‘Progress’ named for N.I. Sazykin – Russia, (1936–present)
- ARV, ARV Aviation Ltd – United Kingdom
- ASAP, Aircraft Sales & Parts – Canada
- ASJA, AB Svenska Järnvägsverkstädernas Aeroplanavdelning – Sweden
- ASL, ASL Hagfors Aero AB – Sweden
- Asso Aerei, Asso Aerei Srl – Italy
- Associated Air, Associated Air – United States
- ASTA, Aerospace Technologies of Australia Pty Ltd – Australia, (1986–present)
- Astra, Astra Societe de Constructions Aeronautiques – France, (1909–1921) > Nieuport
- ATB, First Naval Air Technical Bureau (abbreviated Kugisho) – Japan, (1969–1996) > Aeronautical Development Agency
- ATEC, ATEC v.o.s. – Czech Republic, (1992–present)
- Ateliers Aeronautiques de Colombes, Ateliers Aeronautiques de Colombes – France, −1945
- Ateliers Aéronautiques de Suresnes (AAS) (France) – founded 1945, now defunct
- Atlantic-Fokker, Atlantic Fokker Corporation (American Fokker) – United States
- Atlas, Atlas Aircraft Company – United States, (1948)
- Atlas, Atlas Aircraft Corporation of South Africa (Pty) Ltd – South Africa, (1965–present)
- Atlas, Atlas Aviation (Pty) Ltd – (South Africa)
- Atlas, Atlas Aviation, Division of Denel (Pty) Ltd – South Africa
- ATR, GIE Avions de Transport Régional – France/Italy, (1981–present)
- Aubert, Aubert Aviation – France, (1932–1940, 1945–1959)
- Aurora Flight Sciences, Aurora Flight Sciences Corp. – United States (1989–present)
- Aurore Sarl, Sauvagnon, France
- Auster, Auster Aircraft Ltd – United Kingdom, (1946–1961)
- Austflight, Austflight ULA Pty Ltd – Australia
- Austin, Austin Motor Company – United Kingdom
- Australian Aircraft & Engineering, Australian Aircraft & Engineering – Australia, (1910–1923)
- Australian Aircraft Consortium, Australian Aircraft Consortium – Australia, (1982–1985) (A joint venture between the Government Aircraft Factories, the Commonwealth Aircraft Corporation and Hawker de Havilland.) > Hawker de Havilland
- Australian Aircraft Kits, Taree, New South Wales, Australia
- Australian Autogyro – Australia (1984–?)
- Australite, Australite Inc – United States
- AUT, Aeronautica Umbra Trojani – Italy, (1935–?)
- Auto-Aero, Auto-Aero – Hungary
- AutoGyro GmbH, Hildesheim, Germany
- Av8er Limited, Woodford Halse, Northamptonshire, United Kingdom
- Avantage, Advantage Aircraft Building Company Ltd – Russia, (2000–present)
- Avcraft, AvCraft Aerospace GmbH – Germany
- Avcraft, AvCraft Aviation LLC – United States
- AVE, Advanced Vehicle Engineers – United States, (1971–1973)
- Avgur, Augur Aeronautical Centre – Russia, (1991–present)
- Avia (1), Azionari Vercellese Industrie Aeronautiche – Italy
- Avia (2), Avia-Zavody Jirího Dimitrova – Czechoslovakia, (1919–1958)
- Avia (3), Nauchno-Proizvodstvennoe Obedinenie Avia – Russia
- Avia Baltika, Avia Baltika Aviation Ltd – Lithuania
- Aviabellanca, AviaBellanca Aircraft Corporation – United States, (1983–present)
- Aviafiber – Switzerland
- Aviaimpex, Aviaimpex JSC – Ukraine
- Aviamilano, Aviamilano Costruzioni Aeronautiche SRL – Italy, (1955–1968)
- Aviant, Kiev State Aviation Plant – Ukraine
- Aviastar, Ulyanovsk Aviation Industrial Complex ‘Aviastar’ JSC – Russia, (1976–present)
- Aviastroitel, AviaStroitel Ltd – Russia
- Aviasud, Aviasud Engineering SA – France
- Aviat, Aviat Aircraft Inc – United States, (1991–present)
- Aviat, Aviat Inc – United States
- Aviatik, Österreichische-Ungarische Flugzeugfabrik Aviatik – Austria, (1910–1918) (Automobil und Aviatik)
- Aviatika, Aviatika JSC – Russia
- Aviatika, Kontsern Aviatika – Russia
- Aviation, Aviaton Nauchno-Proizvodstvennaya Aviatsionnaya Firma – Russia
- Aviation Development, Aviation Development International Ltd – United States
- Aviation Farm, Aviation Farm Ltd – Poland
- Aviation Industries of Iran, Iran
- Aviation Normand Dube, Sainte-Anne-des-Plaines, Quebec, Canada
- Aviation Scotland, Aviation Scotland Ltd – United Kingdom
- Aviation Traders, Aviation Traders (Engineering) Ltd – United Kingdom, (1949–1962)
- Avibras, Avribras Aeroespacial SA – Brazil, (1963–1967) (Aviation Brazil)
- Avid, Avid Aircraft Inc – United States
- Avioane Craiova, SC Avioane Craiova SA – Romania
- Aviones de Colombia, Aviones de Colombia SA – Colombia
- Avions Fairey, Avions Fairey SA – Belgium, (1931–1978) > Aêrospatiale
- Avions Fairey, Fairey SA – Belgium
- Avions JDM – France
- Aviotechnica, Aviotechnica Ltd – Bulgaria/Russia
- Avipro, AviPro Aircraft Ltd – United States
- AVIS, AVIS Aircraft – Hungary, (1933–1936)
- AVPK Sukhoi, Aviation Military-Industrial Complex Sukhoi – Russia, (1996–present)
- Avro, A. V. Roe & Company – United Kingdom, (1910–1963) > Hawker Siddeley
- Avro, A. V. Roe & Company Ltd – United Kingdom
- Avro, Avro International Aerospace Ltd – United Kingdom
- Avro Canada, Avro Aircraft Canada – Canada, (1945–1962) > Hawker Siddeley
- Avtek, Avtek Corporation – United States, (1982–?)
- Ayres, Ayres Corporation – United States, (?-2001) > Thrush Aircraft
- Azalea, Azalea Aviation – United States