| Advanced Artificial Intelligence | Academic & Science |
| American Academy of Innovation | Academic & Science |
| Amino Acid Identity | Academic & Science |
| Asociación Internacional de Actuarios | Academic & Science |
| Asociación Argentina de Inventores | Academic & Science |
| Argentine Association of Inventors | Academic & Science |
| Asociación Argentina de Inventores | Academic & Science |
| Automatic Accounting Instructions | Accounts and Finance |
| Arraias | Airport Code |
| American Association of Immunologistsis | Associations & Organizations |
| Architectural Association of Ireland | Associations & Organizations |
| American Association of Immunologists | Business |
| Auburn Armature Inc | Business |
| Airtran Holdings, Inc. | Business |
| Assael Associates Inc | Business |
| American Atelier Incorporated | Business |
| All Asia Internet | Business |
| Amateur Astronomers Inc | Business |
| Accredited Advisor in Insurance | Business |
| All Agency Inventory | Business |
| American Athletic Incorporated | Business |
| Adam Aircraft Industries | Business |
| AirTran Holdings | Business |
| Altruistic Autonomous Individuals | Community |
| American Artists Incorporated | Community |
| Agribusiness Association of Iowa | Community |
| Africa-America Institute | Community |
| Arcata Arts Institute | Community |
| Animal Association International | Community |
| Arab American Institute | Community |
| ActionAid International | Community |
| Animal Artificial Intelligence | Computing |
| Authentication and Authorization Infrastructure | Computing |
| Augmented Artificial Intelligence | Computing |
| Artificial Artificial Intelligence | Computing |
| Applications Alarms Infrastructure | Computing |
| Applied Artificial Intelligence | Computing |
| Acuity Assessment Instrument | General |
| Authentication and Authorisation Infrastructure | General |
| Active and Available Inventory | General |
| Akron Ascent Innovations | General |
| Accountability Agility and Intrapreneurship | General |
| Adolescents Achieving Independence | General |
| Atlanto Axial Instability | General |
| Absorbing Aerosol Index | General |
| Ataxian Athlete Initiative | General |
| Authentication and Authorisation Infrastructures | General |
| All Appropriate Inquiries | General |
| Accuracy Agility Instrument | General |
| Animal Assisted Interventions | General |
| Aircraft Armament Inc | General |
| American Apprenticeship Initiative | General |
| Auto Alliance International | General |
| Automobile and Automotive Industries | General |
| Air Assist Injection | General |
| Asia Automobile Industries | General |
| Automotive Artificial Intelligence | General |
| Assessment Associates International | General |
| Aircraft Armaments Incorporated | General |
| Australian Automotive Intelligence | General |
| Asia Automotive Intelligence | General |
| Automobile Association of India | General |
| Automobiles Anciennes de l'Indre | General |
| Alliance for Automotive Innovation | General |
| Arrival Aircraft Interval | Governmental |
| All Appropriate Inquiry | Governmental |
| Airport Authority of India | Governmental |
| All Aspects of Industry | Governmental |
| Atheist Alliance International | Governmental |
| Académie d'Armes Internationale | Governmental |
| Achievement Assessment Institute | Governmental |
| American Avalanche Institute | Governmental |
| Airline Avionics Institute | Governmental |
| Arizona Automotive Institute | Governmental |
| American Alpine Institute | Governmental |
| American Antitrust Institute | Governmental |
| Accredited Adviser In Insurance | Insurance |
| Alianza Anticomunista Iberica | International |
| Asian Atlantic Industries | International |
| Asian Arts Initiative | International |
| Acute Alcohol Intoxication | Medical |
| Automatic Autodin Interface | Military and Defence |
| All-actor Integration | Military and Defence |
| Additional Authorized Items | Military and Defence |
| Army Analysis Intelligence | Military and Defence |
| Authorized Active Inventory | Military and Defence |
| Air-to-air Intercept | Military and Defence |
| Airports Authority of India | Miniratna Central Public Sector Enterprise |
| Acts Atm Internetwork | Networking |
| African Access Initiative | Regional |
| Africa Adaptation Initiative | Regional |
| American Athletic Inc | Sports |
