| 1 | PL | Airstars, Airways Company | ICAO: ASE, Callsign: Morozov, | RUS | AVCODES |
| 2 | PL | Plymouth Aero Club Ltd. | Callsign: Plyfly, | GB | AVCODES |
| 3 | PL | Southern Air Charters Co. Ltd. | ICAO: SOA, Callsign: South Aircharter, | BS | AVCODES |
| 4 | PL | PACIFIC LUMBER | | | PWRC |
| 5 | PL | Other | | PL | TRAFFIC |
| 6 | PL&W | The Pittsburgh, Lisbon & Western R.R. Co. | 7/1923-7/1936 | | NAKINA |
| 7 | PL&W | PL&W RAILROAD CO., INC. {PITTSBURGH, LISBON & WESTERN RAILROAD CO.] | | | PWRC |
| 8 | PLA | Polynesian Air-Ways | Callsign: Polyair, | USA | AVCODES |
| 9 | PLA | Polynesian Air-Ways | | | ICAO1 |
| 10 | PLA | NILES CANYON RAILWAY [PACIFIC LOCOMOTIVE ASSOCIATION] | | | PWRC |
| 11 | PLA | People's Liberation Army | | PRC | TRAFFIC |
| 12 | PLA | Franz Plasser Vermietung von Bahnbaumaschinen GmbH | | AT | VKM |
| 13 | PLAA | PLAISANT, A TRUCKING INC | | | SCAC3 |
| 14 | PLAAF | People's Liberation Army Air Force | | PRC | TRAFFIC |
| 15 | PLAB | PEARSON LOGISTICS CORPORATION | | | SCAC4 |
| 16 | PLAC | PLAZA TRUCKING CO | | | SCAC3 |
| 17 | PLAD | PRAIRIE LAND EXPRESS | | | SCAC3 |
| 18 | PLAD | PRAIRIE LAND EXPRESS | | | SCAC4 |
| 19 | PLAF | PLANTATION FOODS INC | | | SCAC3 |
| 20 | PLAG | PLATZ, GORDON | | | SCAC3 |
| 21 | PLAG | Panlog AG | | CH | VKM |
| 22 | PLAH | PLANTECH CONTROL SYSTEMS INC | | | SCAC4 |
| 23 | PLAI | PLAINS TRUCKING | | | SCAC4 |
| 24 | PLAJ | PENN, LAWRENCE A JR TRUCKING | | | SCAC3 |
| 25 | PLAK | PEMBINA COONY LTD | | | SCAC4 |
| 26 | PLAL | PLATTE TRUCK LINE | | | SCAC3 |
| 27 | PLAL | PEOPLE & LOGISTICS AMERICA INC | | | SCAC4 |
| 28 | PLAM | PLAMONDON TRANSPORT, INC | | | SCAC3 |
| 29 | PLAM | PLAMONDON TRANSPORT, INC | | | SCAC4 |
| 30 | PLAN | PLANTT BROTHERS TRUCKING | | | SCAC4 |
| 31 | PLAO | PLATO AGENCIES INC. | | | SCAC3 |
| 32 | PLAO | P & L LOGISTICS INC | | | SCAC4 |
| 33 | PLAP | PORTLAND PIPE LINE CORPORATION | | | SCAC3 |
| 34 | PLAP | PORTLAND PIPE LINE CORP | | | SCAC4 |
| 35 | PLAR | POLAR EXPRESS INC | | | SCAC3 |
| 36 | PLAS | PLAINS TRANSPORTATION INCORPORATED | | | SCAC4 |
| 37 | PLAS | Plasmor Ltd | | UK | VKM |
| 38 | PLAT | PLATTER, LEE C | | | SCAC3 |
| 39 | PLATA | P.H.U. Lokomotiv | | PL | VKM |
| 40 | PLAU | POLAR CONTAINER SPECIAL EQUIPMENT LIMITED | | PRC | BIC |
| 41 | PLAU | | City: Plauen | D | TRAFFIC |
| 42 | PLAV | PLATEAU VALLEY MOTOR FREIGHT | | | SCAC3 |
| 43 | PLAV | PINE LINE RACING | | | SCAC4 |
| 44 | PLAW | PLATIN ARROW MARINE LTD | | | SCAC3 |
| 45 | PLAX | PORT OF LOS ANGELES | | | PWRC |
| 46 | PLAXTON | Plaxton | | GB | TRAFFIC |
| 47 | PLB | Polls, Center For Parachute And Expeditionary Works | Callsign: Antex, | RUS | AVCODES |
| 48 | PLB | Polynesian Blue | IATA: DJ | | ICAO1 |
| 49 | PLB | PLYMOUTH & BROCKTON STREET RAILWAY | | | SCAC4 |
| 50 | PLBC | PIONEER LOG HOMES OF BRITISH COLUMB | | | SCAC4 |
| 51 | PLBD | PALMENTERE BROTHERS DISTRIBUTING CO | | | SCAC3 |
| 52 | PLBD | POLAR RUBBER PRODUCTS INC | | | SCAC4 |
| 53 | PLBE | PIONEER LOGISTICS SYSTEMS INC | | | SCAC4 |
| 54 | PLBF | PRIME LOGISTICS INT'L INC3225 SW 12 | | | SCAC4 |
| 55 | PLBH | PIONEER LOGISTICS SOLUTIONS LLC | | | SCAC4 |
| 56 | PLBJ | PHARMALOGIC LTD | | | SCAC4 |
| 57 | PLBK | PETROKIM LLC | | | SCAC4 |
| 58 | PLBL | PALMER BARGE LINES | | | SCAC3 |
| 59 | PLBP | PROMPT LOGISTICS | | | SCAC4 |
| 60 | PLBQ | PEOPLE & LOGISTICS TRANSPORT INC | | | SCAC4 |
| 61 | PLBW | PROMISED LAND LOGISTICS LLC | | | SCAC4 |
| 62 | PLC | Police Aviation Services Ltd. | Callsign: Police, Founded on 17 September 1984. Name changed to Specialist Aviation Services Ltd. w.e.f. 01 June 2015. Police Aviation Services Ltd. | GB | AVCODES |
| 63 | PLC | Specialist Aviation Services Ltd. | Callsign: Special, Name changed from Police Aviation Services Ltd. w.e.f. 01 June 2015. | GB | AVCODES |
| 64 | PLC | Police Aviation Services | | | ICAO1 |
| 65 | PLCA | PIGGY-BACK SHIPPERS ASSOCIATION | | | SCAC3 |
| 66 | PLCA | PALM COAST | | | SCAC4 |
| 67 | PLCB | PEARL INC | | | SCAC3 |
| 68 | PLCC | PAULS CARTAGE INC | | | SCAC3 |
| 69 | PLCE | PALACE TANKERS INC. | | | SCAC3 |
| 70 | PLCF | PRIME LOGISTICS CORP | | | SCAC4 |
| 71 | PLCH | PAYLESS CASHWAY INC | | | SCAC3 |
| 72 | PLCI | PELLCO TRUCKING INC | | | SCAC3 |
| 73 | PLCK | PALCO TRUCKING INC | | | SCAC3 |
| 74 | PLCL | PALMER, C L TRUCKING INC | | | SCAC3 |
| 75 | PLCL | P L C TRANSPORTATION LLC | | | SCAC4 |
| 76 | PLCM | PLACE MACHINE CORP | | | SCAC3 |
| 77 | PLCN | PELICAN TRUCK LINE INC | | | SCAC3 |
| 78 | PLCO | PINSPOTTER LEASING CORP | | | SCAC3 |
| 79 | PLCO | POIRIER, LUC TRANSPORT ENR | | | SCAC4 |
| 80 | PLCP | PILCHS PETROLEUM CORPORATION | | | SCAC3 |
| 81 | PLCQ | PREFERRED LOAD CARRIERS LC | | | SCAC4 |
| 82 | PLCR | PLACER TRUCKING | | | SCAC3 |
| 83 | PLCR | PLANE CARGO INC | | | SCAC4 |
| 84 | PLCS | PALLET CONSULTANTS CORP | | | SCAC4 |
| 85 | PLCU | PLCS INTERNATIONAL | | NL | BIC |
| 86 | PLCV | PANTOS LOGISTICS CANADA INC | | | SCAC4 |
| 87 | PLCW | PLUNKARD, C W INC | | | SCAC3 |
| 88 | PLCW | PROVINCIAL SIGN SYSTEMS | | | SCAC4 |
| 89 | PLCX | General Electric Rail Services Corp. | added 1/2000; 7/2000-7/2005 | | NAKINA |
| 90 | PLCX | General Electric Railcar Services Corp. | added 10/1992; 1/1994; eliminated 1/2000 | | NAKINA |
| 91 | PLCX | Pullman Leasing Co. | added 4/1981; eliminated 1/1990 | | NAKINA |
| 92 | PLCX | Itel Rail Corp. | added 1/1990; eliminated 10/1992 | | NAKINA |
| 93 | PLCX | Pullman Leasing Co., a Subsidiary of Pullman Inc. | added 1/1976; 1/1980; eliminated 4/1981 | | NAKINA |
| 94 | PLCX | Plastics Division, Allied Chemical Corp. | added 4/1961; 4/1961; eliminated 7/1964 | | NAKINA |
| 95 | PLCX | Plastics and Coal Chemicals Division, Allied Chemical Corp. | added 10/1958; eliminated 4/1961 | | NAKINA |
| 96 | PLCX | Plastics and Coal Chemicals Division, Allied Chemical Corp. | added 10/58; eliminated 4/61 | | NRHS |
| 97 | PLCX | Plastics Division, Allied Chemical Corp. | added 4/61; 4/61; eliminated 7/64 | | NRHS |
| 98 | PLCX | Pullman Leasing Co., a Subsidiary of Pullman Inc. | 1/80; eliminated 4/81 | | NRHS |
| 99 | PLCX | Pullman Leasing Co. | added 4/81; eliminated 1/90 | | NRHS |
| 100 | PLCX | Itel Rail Corp. | added 1/90; eliminated 10/92 | | NRHS |
