| 1 | PAS | P.T. Pelita Air Service | IATA: 6D, Callsign: Pelita, IATA Prefix: 019, IATA designator changed to 6D. Designator 6D* reinstated by IATA | RI | AVCODES |
| 2 | PAS | P.T. Pelita Air Service | IATA: 6D, Callsign: Pelita, IATA Prefix: 019, IATA designator changed from 6D*. Designator 6D* reinstated by IATA | RI | AVCODES |
| 3 | PAS | P.T. Pelita Air Service | IATA: IP, Callsign: Pelita, IATA Prefix: 019, Designator 6D recalled by IATA. IATA designator changed from 6D*. Designator 6D* reinstated by IATA | RI | AVCODES |
| 4 | PAS | Pelita Air Service | | | ICAO1 |
| 5 | PAS | Pan Am Southern | | | RSRV |
| 6 | PAS | PAN AM SOUTHERN LLC | | | SCAC4 |
| 7 | PASB | PUTMAN & SONS BUS SERVICE | | | SCAC3 |
| 8 | PASB | POLSTON, ALLEN S | | | SCAC4 |
| 9 | PASC | PORT AUTHORITY OF SHELBY COUNTY | | | PWRC |
| 10 | PASC | PASCHALL TRUCK LINES INC | | | SCAC3 |
| 11 | PASC | PASCHALL TRUCK LINES INC (KY-CORP) | | | SCAC4 |
| 12 | PASG | PALM SPRINGS MOVING & STORAGE | | | SCAC3 |
| 13 | PASI | PACIFIC AIR SHIPPERS ASSN INC | | | SCAC3 |
| 14 | PASI | PATRON SING, FAUSTO | | | SCAC4 |
| 15 | PASJ | PASHA TRUCKING LLC | | | SCAC4 |
| 16 | PASK | PASCAL ENTERPRISE | | | SCAC3 |
| 17 | PASK | PASK FARMS LTD | | | SCAC4 |
| 18 | PASL | PASILLAS GUEVARA, MARISELA | | | SCAC4 |
| 19 | PASM | PASCALE, M TRUCKING, INC | | | SCAC3 |
| 20 | PASM | PASMEL EXPRESS INC | | | SCAC4 |
| 21 | PASN | PARSONS COAL COMPANY, INC | | | SCAC3 |
| 22 | PASN | PARSONS COAL COMPANY, INC | | | SCAC4 |
| 23 | PASO | PASCO PIPELINE COMPANY | | | SCAC3 |
| 24 | PASOLINI | Pasolini VCB | | I | TRAFFIC |
| 25 | PASP | PASCUZZO, M SAND & STONE SUPPLY INC | | | SCAC3 |
| 26 | PASQ | PASQUALE TRUCKING COMPANY INC | | | SCAC3 |
| 27 | PASQ | PASQUALE TRUCKING COMPANY INC | | | SCAC4 |
| 28 | PASR | PATRIOT TRANSPORT SOLUTIONS INC | | | SCAC4 |
| 29 | PASS | PROVINCIAL-AMERICAN TRUCK TRANSPORT | | | SCAC3 |
| 30 | PASS | PaSS spol s.r.o | | SK | VKM |
| 31 | PASSAT | Passic-Athenia Bus Company | | US-NJ | TRAFFIC |
| 32 | PASSV | Passaic Valley | | US-NJ | TRAFFIC |
| 33 | PAST | PARSONS TRANS, INC | | | SCAC3 |
| 34 | PAST | PARSONS TRANS INC | | | SCAC4 |
| 35 | PASU | PACIFIC LINES | | VN | BIC |
| 36 | PASU | PITT & SCOTT LTD | | | SCAC3 |
| 37 | PASV | PARK SERVICE CO INC | | | SCAC3 |
| 38 | PASV | PACART | | | SCAC4 |
| 39 | PASW | PASZKOWSKI TRANSPORT INC | | | SCAC4 |
| 40 | PASX | Pacer International d/b/a Pace Stacktrain | added 4/2000; 7/2000 (not listed); 7/2005 | | NAKINA |
| 41 | PASX | American Oil Co. | added 4/1957; 10/1957-10/1966; eliminated 4/1968 | | NAKINA |
| 42 | PASX | Pan-Am Southern Corp. | 1/1950-7/1954; eliminated 4/1957 | | NAKINA |
| 43 | PASX | Pan-Am Southern Corp. | 1/52; eliminated 4/57 | | NRHS |
| 44 | PASX | American Oil Co. | added 4/57; 10/57-10/66; eliminated 4/68 | | NRHS |
| 45 | PASX | Pacer International d/b/a Pace Stacktrain | added 4/2000; 7/2000 | | NRHS |
| 46 | PASX | *AMERICAN OIL CO. [PAN-AM SOUTHERN CORP.] | | | PWRC |
| 47 | PASX | *PASSUMPSIC RAILROAD | | | PWRC |
| 48 | PASX | +PACER INTERNATIONAL d/b/a PACER STACKTRAIN | | | PWRC |
| 49 | PASX | Pacer Stacktrain | | | RSRV |
| 50 | PASX | PACER INTERNATIONAL INC | | | SCAC4 |
| 51 | PASY | PENNSYLVANIA SECURITY CORPORATION | | | SCAC3 |
| 52 | PASY | PASCON | | | SCAC4 |
