| 5601 | PLXI | PELLETROX INC | | | SCAC3 |
| 5602 | PLXI | PELLETROX INC | | | SCAC4 |
| 5603 | PLXL | PLG EXPEDITE LTD | | | SCAC4 |
| 5604 | PLXP | PLASTIC EXPRESS | | | SCAC3 |
| 5605 | PLXP | PLASTIC EXPRESS | | | SCAC4 |
| 5606 | PLXQ | PETROL TRANSPORT INC | | | SCAC4 |
| 5607 | PLXR | PALMETTO EXPRESS | | | SCAC3 |
| 5608 | PLXT | POLMAX TRANSPORTATION INC | | | SCAC4 |
| 5609 | PLXV | PURE LUXURY LIMOUSINE SERVICE INC | | | SCAC4 |
| 5610 | PLXW | PALMETTO EXPRESS | | | SCAC4 |
| 5611 | PLXZ | RETIRED 05-27-93 ATP | | | PWRC |
| 5612 | PLY | Puma Air Linhas Aereas | Name changed to Puma Linhas Aereas Ltda | BR | AVCODES |
| 5613 | PLY | Puma Linhas Aereas Ltda | IATA: Z4, Callsign: Puma Brasil, Founded in 2002. Ceased operations on 16 August 2011. Name changed from Puma Air Linhas Aereas | BR | AVCODES |
| 5614 | PLY | Puma Linhas Aereas | | | ICAO1 |
| 5615 | PLY | | | USA | TRAFFIC |
| 5616 | PLYH | PELY SHIPPING CORP | | | SCAC4 |
| 5617 | PLYK | POLYAK DISTRIBUTORS INC | | | SCAC4 |
| 5618 | PLYL | PLYCAR LLC | | | SCAC4 |
| 5619 | PLYO | PELAYO TRUCKING | | | SCAC3 |
| 5620 | PLYP | PLYMOUTH PIPE LINE COMPANY | | | SCAC3 |
| 5621 | PLYP | PLASTIQUES CELLULAIRES POLY FORM IN | | | SCAC4 |
| 5622 | PLYQ | PLY-CHAMP TRUCK LINES | | | SCAC3 |
| 5623 | PLYR | POLYMER TRANSPORT INC | | | SCAC3 |
| 5624 | PLYS | POLYS PRODUCT CARRIER CORPORATION | | | SCAC4 |
| 5625 | PLYT | PLYMOUTH TRANSPORT INC | | | SCAC3 |
| 5626 | PLYX | Champion International Corp. | added 10/1972; 1/1975; eliminated 7/1977 | | NAKINA |
| 5627 | PLYX | U.S. Plywood-Champion Papers, Inc. | added 7/1969; 4/1970; eliminated 10/1972 | | NAKINA |
| 5628 | PLYX | United States Plywood Corp. | added 4/1967; eliminated 7/1969 | | NAKINA |
| 5629 | PLYX | United States Plywood Corp. | added 4/67; eliminated 7/69 | | NRHS |
| 5630 | PLYX | U.S. Plywood-Champion Papers, Inc. | added 7/69; 4/70; eliminated 10/72 | | NRHS |
| 5631 | PLYX | Champion International Corp. | added 10/72; 1/75; eliminated 7/77 | | NRHS |
| 5632 | PLYX | CHAMPION INTERNATIONAL CORP. [U.S. PLYWOOD CORP.] | | | PWRC |
| 5633 | PLZ | Planet Airways | Callsign: Planet, | USA | AVCODES |
| 5634 | PLZ | Patient Airlift Services, Inc | Callsign: Pals Hopes, | USA | AVCODES |
| 5635 | PLZ | Planet Airways | | | ICAO1 |
| 5636 | PLZA | PLAZA IMPORTERS INC | | | SCAC4 |
| 5637 | PLZC | PETERSON & LATZIG CO INC | | | SCAC3 |
| 5638 | PLZI | POLZIN INC | | | SCAC3 |
| 5639 | PLZM | PLAZA MOTORS | | | SCAC3 |
| 5640 | PLZM | PLAZA MEXICO | | | SCAC4 |
| 5641 | PLZS | PULIZ MOVING & STORAGE CO INC | | | SCAC3 |
| 5642 | PLZS | PULIZ MOVING & STORAGE CO INC | | | SCAC4 |
| 5643 | PLZT | POLAZ TRANSPORT | | | SCAC4 |
| 5644 | PM | Tropic Air Limited | ICAO: TOS, Callsign: Tropiser, Designator PM recalled by IATA | BH | AVCODES |
| 5645 | PM | Brymon Aviation Ltd. d/b/a Brymon Airways | ICAO: BRY, Callsign: Brymon, IATA designator changed to BC | GB | AVCODES |
| 5646 | PM | POLUS Centre for Parachute and Expeditional Works | Designator PM* recalled by IATA | RUS | AVCODES |
| 5647 | PM | Compania Internacional de Aviacion, S.A. (COPISA) | | PE | AVCODES |
| 5648 | PM | Pamir Airways | ICAO: PIR, Callsign: Pamir, Ceased operations in 2011. | AFG | AVCODES |
| 5649 | PM | Prescott Support Company | ICAO: PSK, Callsign: Support, | USA | AVCODES |
| 5650 | PM | Canaryfly S.L. | ICAO: CNF, Callsign: Canary, | E | AVCODES |
| 5651 | PM | Chesapeake and Ohio Ry. Co. | eliminated 10/1980 | | NAKINA |
| 5652 | PM | Chesapeake and Ohio Ry. Co. (Pere Marquette Dist.) | 1/1975-1/1980 | | NAKINA |
| 5653 | PM | Chesapeake and Ohio Ry. Co. | 10/1966 | | NAKINA |
| 5654 | PM | Chesapeake and Ohio Ry. Co. | Oct-66 | | NRHS |
| 5655 | PM | Chesapeake and Ohio Ry. Co. (Pere Marquette Dist.) | 1/75-1/80 | | NRHS |
| 5656 | PM | Chesapeake and Ohio Ry. Co. | eliminated 10/80 | | NRHS |
| 5657 | PM | CSX CORP. [CHESSIE SYSTEM; CHESAPEAKE & OHIO; PERE MARQUETTE RWY.] | | | PWRC |
| 5658 | PM | Pere Marquette Railway (CSX Transportation) | | | RSRV |
| 5659 | PM | Pere Marquette Railway | | USA | TRAFFIC |
| 5660 | PM | KGHM Polska Miedz SA | | PL | VKM |
| 5661 | PMA | Pan Malaysian Air Transport | Callsign: Pan Malaysia, | MAL | AVCODES |
| 5662 | PMA | Pan Malaysian Air Transport | | | ICAO1 |
| 5663 | PMAB | PRO MOTION LOGISTICS LLC | | | SCAC4 |
| 5664 | PMAH | PHILLIPS MOVING AND STORAGE | | | SCAC4 |
| 5665 | PMAI | PMA INC | | | SCAC3 |
| 5666 | PMAK | PRICE, MATT TRUCKING | | | SCAC4 |
| 5667 | PMAL | POTTSVILLE MOVING AND STORAGE COMPA | | | SCAC4 |
| 5668 | PMAM | PELCHAT, MARC & FAVREAU, MARIE-CLAU | | | SCAC4 |
| 5669 | PMAQ | PRECISE MESSENGER AND TRUCKING INC | | | SCAC4 |
| 5670 | PMAR | PARE, MARC | | | SCAC4 |
| 5671 | PMAS | PIONEER MOVING & STORAGE INC | | | SCAC3 |
| 5672 | PMAT | P M A TRANSPORT INC | | | SCAC3 |
| 5673 | PMAU | PETRO-TAINO TRANSPORT CORPORATION | | USA | BIC |
| 5674 | PMAV | POLA MARITIME LTD | | | SCAC4 |
| 5675 | PMAX | PMA Transportation Corp. | added 1/1979; 1/1980; eliminated 1/1994; 1/1994-7/2005 (not listed) | | NAKINA |
| 5676 | PMAX | PMA Transportation Corp. | added 1/79; 1/80; eliminated 1/94; 7/2000 | | NRHS |
| 5677 | PMAX | PMA TRANSPORTATION CORP. | | | PWRC |
| 5678 | PMAX | PMA Transportation Corporation | | | RSRV |
| 5679 | PMAX | PMA TRANSPORTATION CORP. | | | SCAC4 |
| 5680 | PMBA | POSADA MORALES, BLANCA ROSARIO | | | SCAC4 |
| 5681 | PMBAC | PAMBAC SA | | RO | VKM |
| 5682 | PMBC | PEMBINA COOP | | | SCAC4 |
| 5683 | PMBE | PETRA MARBLE & GRANITE INC | | | SCAC4 |
| 5684 | PMBH | PLUMMER MOBILE HOME MOVING | | | SCAC3 |
| 5685 | PMBJ | PETERSEN, M BJORN TRANSPORTATION | | | SCAC3 |
| 5686 | PMBJ | PETERSEN, M BJORN TRANSPORTATION IN | | | SCAC4 |
| 5687 | PMBN | PRODUITS MOBILICAB CANADA INC | | | SCAC4 |
| 5688 | PMBQ | PRITCHETTS, MOE BBQ SAUCE | | | SCAC4 |
| 5689 | PMBR | PEMBERTON TRUCK LINES INC | | | SCAC3 |
| 5690 | PMBR | PEMBERTON TRUCK LINES INC | | | SCAC4 |
| 5691 | PMBS | PEMBERTON TRANSPORT CO LTD | | | SCAC4 |
| 5692 | PMBU | PBM GAS LTD | | | SCAC4 |
| 5693 | PMBV | PT MERANTI BAHARI | | | SCAC4 |
| 5694 | PMBW | PRISM - BERLIE (WINDSOR) LTD (DIV O | | | SCAC4 |
| 5695 | PMBY | PRIORITY MOVING INC | | | SCAC4 |
| 5696 | PMBZ | PUERTO RICO MARINE BEARTH | | | PWRC |
| 5697 | PMC | Primac Courier, Inc. | Callsign: Primac, | USA | AVCODES |
| 5698 | PMC | Primas Courier | | | ICAO1 |
| 5699 | PMC | Philippine Marine Corps | | RP | TRAFFIC |
| 5700 | PMCA | PILCHER MACHINERY COMPANY | | | SCAC3 |
