| Abbreviation | Definition |
|---|---|
| AASG | Automotive Appraisal Services Group |
| AASG | Avjets Aviation Services Group |
| AASI | Acadian Ambulance Service International |
| AASI | Advanced Aerodynamics and Structures Inc |
| AASI | Advanced Aerodynamics and Structures, Inc. |
| AASI | Aerosphere Aviation Services Inc |
| AASI | American Agency System, Inc., Topeka, Kansas |
| AASI | Applied Aeronautical Systems Inc |
| AASI | Asset Advisory Services, Inc. |
| AASP | Alliance of Automotive Service Providers |
| AATC | Actors Anonymous Theatre Company |
| AATC | American Avionic Technologies Corporation |
| AATC | Anglo-Argentine Tramways Company |
| AATC | Asian American Theater Company |
| AATI | Advanced Analogic Technologies Inc |
| AATI | Advanced Analogic Techs Inc |
| AATI | Advanced Analytical Technologies Inc |
| AATP | Alice And The Pirates |
| AATP | Australian Accounting & Taxation Professionals |
| AAU | American Athletic Uniforms |