| 1 | POS | Porsche Air Service GmbH | Callsign: Porshce, | A | AVCODES |
| 2 | POS | PORT OF STOCKTON | | | PWRC |
| 3 | POSA | PEOSTA WAREHOUSING INC | | | SCAC4 |
| 4 | POSC | PROTECTOSEAL CO | | | SCAC3 |
| 5 | POSC | PADILLA M, OSCAR | | | SCAC4 |
| 6 | POSD | POSEIDON INC | | | SCAC4 |
| 7 | POSG | PAROS SHIPPING CORP | | | SCAC3 |
| 8 | POSH | PORTSMOUTH TRUCKING COMPANY, THE | | | SCAC3 |
| 9 | POSI | POST EXPRESS TRUCKING | | | SCAC3 |
| 10 | POSJ | POSEIDON LINES INC | | | SCAC4 |
| 11 | POSK | PALLETON OF SOUTH DAKOTA INC | | | SCAC4 |
| 12 | POSL | PIER ONE SERVICES LLC | | | SCAC4 |
| 13 | POSO | POSEIDON LINES | | | SCAC4 |
| 14 | POSQ | POSTMA EXPRESS INC | | | SCAC4 |
| 15 | POSR | PHOINIX | | | SCAC3 |
| 16 | POSS | PROMAR AGENCY INC | | | SCAC4 |
| 17 | POST | POST, R F INC | | | SCAC3 |
| 18 | POST | Deutsche Post | | D | TRAFFIC |
| 19 | POST | Die Schweizerische Post | | CH | VKM |
| 20 | POSTA | Česká Pošta, s.p., Odštěpný závod Střední Čechy | | CZ | VKM |
| 21 | POSU | POSEIDON SCHIFFAHRT | | | SCAC3 |
| 22 | POSV | PORTSMOUTH TRUCKING COMPANY | | | SCAC3 |
| 23 | POSW | PEGASUS OCEAN SERVICES LTD | | | SCAC3 |
| 24 | POSX | PORT OF SACRAMENTO | | | PWRC |
| 25 | POSY | POSTAL TRANSPORT INC | | | SCAC4 |
| 26 | POSZ | POST | | | PWRC |
