| AAAL | american academy of arts and letters |
|---|---|
| AACO | Amaryllis Avakian Clinica Oftalmologica |
| AACO | American Association of Certified Orthoptists |
| AACO | Arab Air Carriers Organization |
| AACO | Arab Air Carries Organization, Arabská organizácia leteckých dopravcov (angl.skr.) |
| AACO | Armenian American Christian Outreach |
| AACO | Asian Americans for Community Outreach |
| AAPA | American Association of Port Authorities, Americké združenie prístavných úradov (angl.skr.) |
| AAVA | American Academy of Veterinary Acupuncture (skr.) |
| AAVA | American Association of Veterinary Anatomists |