| AAA | amateur athletic association (skr.) |
|---|---|
| AAB | Advertising Association of Baltimore |
| AAB | American Association for Bronchology |
| AAB | American Association of Bioanalytics |
| AAB | Application Architecture Blueprint |
| AAB | Association of Aircraft Brokers, Združenie sprostredkovateľov v leteckej doprave (angl.skr.) |
| AAB | Association of Applied Biologists |
| AACO | American Association of Certified Orthoptists |
| AACO | Arab Air Carriers Organization |
| AACO | Arab Air Carries Organization, Arabská organizácia leteckých dopravcov (angl.skr.) |