| 1 | AOP | Aerospecservice, Aircompany | | RUS | AVCODES |
| 2 | AOP | Aeropiloto | | | ICAO1 |
| 3 | AOPC | AMERICAN OAK PRESERVING CO INC | | | SCAC4 |
| 4 | AOPE | A-1 PIONEER ENTERPRISES INC | | | SCAC4 |
| 5 | AOPI | ASSOCIATED TRANSPORT INC | | | SCAC3 |
| 6 | AOPI | ASSOCIATED TRANSPORT INC | | | SCAC4 |
| 7 | AOPK | A-ONE (A-1) PACKING & TRANSFER CO I | | | SCAC3 |
| 8 | AOPL | ACTION PLUS | | | SCAC3 |
| 9 | AOPL | ACTION PLUS | | | SCAC4 |
| 10 | AOPM | A-ONE (A-1) PIONEER MOVING & STORAG | | | SCAC3 |
| 11 | AOPM | A-ONE (A-1) PIONEER MOVING & STORAG | | | SCAC4 |
| 12 | AOPO | AERO TRANSPORTATION SERVICE INC | | | SCAC3 |
| 13 | AOPO | AUTOTRANSPRO | | | SCAC4 |
| 14 | AOPP | ASSOCIATED PETROLEUM PRODUCTS INC | | | SCAC4 |
| 15 | AOPQ | ALIAPOLLO SHIPPING CO., LTD. | | | SCAC3 |
| 16 | AOPR | ALLENS OIL & PROPANE INC | | | SCAC4 |
| 17 | AOPS | A-ONE (A-1) PUMPING SERVICE INC | | | SCAC3 |
| 18 | AOPT | ARNCO PETROLEUM TRANSPORTATION INC | | | SCAC4 |
