| AAI | American Alpine Institute (skr.) |
|---|---|
| AAI | American Alpine Institution |
| ABI | American Butter Institute |
| ACI | American Concrete Institute |
| ADI | American Defense Institute |
| ADI | American Documentation Institute (skr.) |
| AEI | American Enterprise Institute |
| AHI | Animal Health Institute (skr.) |
| AI | Aquinas Institute |
| AI | Asphalt Institute |