| A4O | označenie lietadiel Ománu, Omán (označenie lietadiel) |
|---|---|
| A9C | označenie lietadiel Bahrajnu |
| AAB | Adaptive Angle Bias |
| AAB | Advertising Association of Baltimore |
| AAB | Airport Advisory Board |
| AAC | Academic Advisory Center |
| AAD | American Academy of Denturity |
| AAD | American Academy of Dermatology |
| AAF | American Advertising Federation |
| AAK | čln na Rýne, riečny nákladný čln |