 Aeronautical Information Publication | Technology |
| American Institute of Physics | Science |
| Airguard | Organizations |
| Allied Intelligence Publication | Military |
| Approval in Principle | Technology |
| Arc Ion Plating | Science |
| Auto-Ignition Point | Science |
| Acute Intermittent Porphyria | Science |
| Aerothermal Instrumentation Package | Science |
| Agreement in Principle | Science |
| Air-Independent Propulsion | Military |
| Airport Improvement Program | Technology |
| Annual Implementation Plan | Business |
| Association of Internet Professionals | Technology |
| Assurance Implementation Plan | Science |
| Astrophysikalisches Institut Potsdam | Common |
| Abandoned in Place | Military |
| Acoustical Information Processing | Common |
| Acquisition Improvement Program | Military |
| Acute Infectious Polyneuritis | Common |