| 3C | Rovníková Guinea (označenie lietadiel) |
|---|---|
| A-CHE | rieka v Číne |
| AAB | Agence Africaine de Biotechnologie |
| AAE | American Association of Engineers (skr.) |
| AAI | American Alpine Institute (skr.) |
| AAI | American Alpine Institution |
| AAM | Anti Aging Medicine |
| AAN | american Alpine News (skr.) |
| ABA | Accredited Business Accountant |
| ABAGNALE | americký zločinec - falšovateľ (Frank, *1948) |