| 501 | PANK | PAN-LINK INTERNATIONAL CORP | | | SCAC4 |
| 502 | PANL | PANTHER LINES INC | | | SCAC3 |
| 503 | PANLOG | Panlog AG | | CH | TRAFFIC |
| 504 | PANN | PANHANDLE EXPRESS | | | SCAC3 |
| 505 | PANN | PANNU TRANSPORT SERVICES LTD | | | SCAC4 |
| 506 | PANO | PANCOST, ALLEN TRUCKING | | | SCAC3 |
| 507 | PANO | PANCOST, ALLEN TRUCKING INC | | | SCAC4 |
| 508 | PANP | PAN AMERICAN PIPE LINE COMPANY | | | SCAC3 |
| 509 | PANP | PETER PAN BUS LINES INC | | | SCAC4 |
| 510 | PANQ | PANAN CARTAGE CO INC | | | SCAC3 |
| 511 | PANS | P A & S SMALL COMPANY | | | SCAC3 |
| 512 | PANS | PRIMA TRANSPORT | | | SCAC4 |
| 513 | PANT | PANTHERS INTERNATIONAL INC | | | SCAC4 |
| 514 | PANU | PANGAS | | CH | BIC |
| 515 | PANU | PANTACOM N.V. | | | SCAC3 |
| 516 | PANU | PANGAS | | | SCAC4 |
| 517 | PANV | PAN PACIFIC EXPRESS CORPORATION | | | SCAC4 |
| 518 | PANW | PAN WESTERN CORPORATION | | | SCAC3 |
| 519 | PANW | PAN WESTERN CORPORATION | | | SCAC4 |
| 520 | PANX | Dorchester Gas Producing Co. | added 4/1962; 7/1965-4/1970; eliminated 4/1971 | | NAKINA |
| 521 | PANX | Dorchester Corp. | added 10/1954; 10/1957-4/1961; eliminated 4/1962 | | NAKINA |
| 522 | PANX | Panoma Corp. | 1/1950-7/1954; eliminated 10/1954 | | NAKINA |
| 523 | PANX | Panoma Corp. | Jan-52 | | NRHS |
| 524 | PANX | Dorchester Corp. | 10/57-4/61; eliminated 4/62 | | NRHS |
| 525 | PANX | Dorchester Gas Producing Co. | added 4/62; 7/65-4/70; eliminated 4/71 | | NRHS |
| 526 | PANX | DORCHESTER GAS PRODUCING CO. [PANOMA CORP.] | | | PWRC |
| 527 | PANYNJ | Port Authority of New York & New Jersey | | USA | TRAFFIC |
| 528 | PAO | Polynesian Limited | IATA: PH, Callsign: Polynesian, IATA Prefix: 162, | WS | AVCODES |
| 529 | PAO | Polynesian Airlines Ltd. | IATA: PH, Callsign: Polynesian, IATA Prefix: 162, | WS | AVCODES |
| 530 | PAO | Polynesian Limited | IATA: OL, Callsign: Polynesian, IATA Prefix: 162, Name changed to Samoa Airways in 2017. | WS | AVCODES |
| 531 | PAO | Samoa Airways | IATA: OL, Callsign: Polynesian, IATA Prefix: 162, Name changed from Polynesian Limited in 2017. | WS | AVCODES |
| 532 | PAO | Polynesian Airlines | IATA: PH | | ICAO1 |
| 533 | PAOB | PENNSYLVANIA ASSOCIATION OF COMMUNI | | | SCAC4 |
| 534 | PAOC | PANICO, C MOTOR SERVICE | | | SCAC3 |
| 535 | PAOC | PACIFIC OCEAN TRANSPORT INC | | | SCAC4 |
| 536 | PAOE | PALOMINO EXPRESS | | | SCAC3 |
| 537 | PAOI | PALMER OIL CO INC | | | SCAC3 |
| 538 | PAOI | PALMER OIL COMPANY INC | | | SCAC4 |
| 539 | PAOK | PATINO TRUCKING | | | SCAC4 |
| 540 | PAOL | PAULSON OIL COMPANY | | | SCAC4 |
| 541 | PAOM | PAROS MARINE COMPANY LIMITED | | | SCAC3 |
| 542 | PAON | PAONE TRUCKING INC | | | SCAC3 |
| 543 | PAOP | PASCO PRODUCTS INC | | | SCAC3 |
| 544 | PAOR | PROVINCIAL-AMERICAN TRUCK TRANSPORT | | | SCAC3 |
| 545 | PAOT | PARRINO TRUCKING | | | SCAC3 |
| 546 | PAOY | PASCOE | | | SCAC4 |
| 547 | PAP | Langtry Flying Group Ltd. | Callsign: Proflight, | GB | AVCODES |
| 548 | PAP | Angkasa Pura Perum | | RI | AVCODES |
| 549 | PAP | Langtry Flying Group | | | ICAO1 |
| 550 | PAPAS | Zarneni hrani 99 /\"Зърнени храни 99\" ЕАД | | BG | VKM |
| 551 | PAPB | PAPER BOARD TRUCKING CORP | | | SCAC3 |
| 552 | PAPC | PAPACHRISTIDIS (CANADA) LIMITED | | | SCAC3 |
| 553 | PAPC | PAPCO INC | | | SCAC4 |
| 554 | PAPD | P & A TRANSPORTATION INC | | | SCAC4 |
| 555 | PAPF | PAPER FIBRES CORPORATION | | | SCAC4 |
| 556 | PAPG | POINT ADAMS PACKING CO | | | SCAC3 |
| 557 | PAPI | PAPILLION TRANSFER | | | SCAC3 |
| 558 | PAPI | PAPINEAU INT S E C | | | SCAC4 |
| 559 | PAPM | PARAPORTI MARITIME CORPORATION | | | SCAC3 |
| 560 | PAPN | PICHE ALAIN TRANSPORT INC | | | SCAC3 |
| 561 | PAPO | PAPARATTO, LOUIS A | | | SCAC3 |
| 562 | PAPP | PAPP PLASTICS & DIST LTD | | | SCAC4 |
| 563 | PAPQ | PAPPAS CARTAGE CO | | | SCAC3 |
| 564 | PAPQ | PENINSULA ASPHALT PAVING INC | | | SCAC4 |
| 565 | PAPR | PAPER RECLAIM | | | SCAC3 |
| 566 | PAPR | PACIFIC ALLIED PRODUCTS LTD | | | SCAC4 |
| 567 | PAPS | PAPS TRUCKING INC | | | SCAC3 |
| 568 | PAPT | PAPER TRANSP | | | SCAC4 |
| 569 | PAPU | PASTRELLO AUTOTRASPORTI SRL | | | SCAC4 |
| 570 | PAPV | PAP SERVICES INC | | | SCAC3 |
| 571 | PAPX | Pennsylvania Pullmans Inc. | 7/2000-7/2005 (not listed) | | NAKINA |
| 572 | PAPX | Pennsylvania Pullmans Inc. | Jul-00 | | NRHS |
| 573 | PAPX | PENNSYLVANIA PULLMANS INC. | | | PWRC |
| 574 | PAPX | Pennsylvania Pullmans | | | RSRV |
| 575 | PAPX | PENNSYLVA | | | SCAC4 |
| 576 | PAQ | Pacific Air Express (Solomon Islands) Limited | Callsign: Solpac, | SOL | AVCODES |
| 577 | PAQI | PORT ALLIANCE LOGISTICS INTERNATION | | | SCAC4 |
| 578 | PAQK | P A R TRUCKING INC | | | SCAC3 |
| 579 | PAQK | P A R TRUCKING INC | | | SCAC4 |
| 580 | PAQL | PACER FUELS TRANSPORT LLC | | | SCAC4 |
| 581 | PAQO | PARKSIDE OIL CO | | | SCAC4 |
| 582 | PAQQ | PASQUAKE QUALITY FOODS INC | | | SCAC3 |
| 583 | PAQS | PAUS | | | SCAC4 |
| 584 | PAQT | PAQUETTE, R L INC | | | SCAC3 |
| 585 | PAQW | PAQUETTE WHITE INC | | | SCAC4 |
| 586 | PAR | Spair Air Transport Corporation | Callsign: Spair, | RUS | AVCODES |
| 587 | PAR | Pacific Rim Airways PTY Ltd. | Callsign: Pacrim, | AUS | AVCODES |
| 588 | PAR | Partner Air Services A/S | Callsign: Partnerair, Name changed to Partnair A/S | N | AVCODES |
| 589 | PAR | Partnair A/S | Callsign: Partnerair, Name changed from Partner Air Services A/S | N | AVCODES |
| 590 | PAR | Pacific Rim Airways | | | ICAO1 |
| 591 | PAR | PACIFIC RAILWAY SOCIETY INC | | | PWRC |
| 592 | PAR | | City: Paris | F | TRAFFIC |
| 593 | PARA | PARAMOUNT EXPRESS OF PATERSON INC | | | SCAC3 |
| 594 | PARAC | Parachini SA (Sersa Group) | | CH | VKM |
| 595 | PARB | PARKER BROTHERS, INC | | | SCAC3 |
| 596 | PARC | CONSOLIDATED RAIL CORP. [PENNSYLVANIA & ATLANTIC RAILROAD CO.] | | | PWRC |
| 597 | PARC | PARCEL DELIVERY, INC | | | SCAC3 |
| 598 | PARD | PARADISE TRUCKING INC | | | SCAC3 |
| 599 | PARD | Pardubice | | CZ | TRAFFIC |
| 600 | PARE | PARE TRANSPORT CO, INC | | | SCAC3 |
