| 1 | PC | Air Fiji Ltd. | ICAO: FAJ, Callsign: Fijiair, IATA Prefix: 677, Ceased operations. Name changed from Fiji Air Services Limited | FJI | AVCODES |
| 2 | PC | Joint Stock Company Continental Airways | ICAO: PVV, Callsign: Contair, IATA Prefix: 922, | RUS | AVCODES |
| 3 | PC | Fiji Air Services Limited | ICAO: FAJ, Callsign: Fijiair, IATA Prefix: 677, Designator PC recalled by IATA | FJI | AVCODES |
| 4 | PC | Pegasus Hava Tasimaciligi A.S. | ICAO: PGT, Callsign: Sunturk, IATA Prefix: 624, IATA designator changed from H9*. IATA designator previously changed from 1I | TR | AVCODES |
| 5 | PC | Envirotainer AB | Non-Airline Unit Load Devices (ULD) Companies | S | AVCODES |
| 6 | PC | Norfolk Southern Ry. Co. (Norfolk Southern) | 7/2000-7/2005 | | NAKINA |
| 7 | PC | Consolidated Rail Corp. | added 4/1976; 1/1980-1/1994; eliminated 7/1999 | | NAKINA |
| 8 | PC | Penn Central Transportation Co., Robert W. Blanchette, Richard C. Bond and John H. McArthur, Trustees | eliminated 4/1976 | | NAKINA |
| 9 | PC | Penn Central Transportation Co. | 1/1975 | | NAKINA |
| 10 | PC | Pacific Coast R.R. Co. | 7/1923-10/1966 | | NAKINA |
| 11 | PC | Pacific Coast R.R. Co. | 4/38-10/66 | | NRHS |
| 12 | PC | Penn Central Transportation Co. | Jan-75 | | NRHS |
| 13 | PC | Penn Central Transportation Co., Robert W. Blanchette, Richard C. Bond and John H. McArthur, Trustees | eliminated 4/76 | | NRHS |
| 14 | PC | Consolidated Rail Corp. | added 4/76; 1/80-1/94; eliminated 7/99 | | NRHS |
| 15 | PC | Norfolk Southern Ry. Co. (Norfolk Southern) | Jul-00 | | NRHS |
| 16 | PC | *PACIFIC COAST RAILROAD | | | PWRC |
| 17 | PC | +NORFOLK SOUTHERN RWY. [CONSOLIDATED RAIL CORP.; PENN CENTRAL TRANSPORTATION CO.] | | | PWRC |
| 18 | PC | Penn Central (Norfolk Southern) | | | RSRV |
| 19 | PC | Penn Central | | USA | TRAFFIC |
| 20 | PCA | Peace Air (Private) Limited | IATA: 6P, Callsign: Peace Air, | CL | AVCODES |
| 21 | PCA | P.C. Air Co., Ltd. | IATA: GT, Callsign: Piyo Air, Ceased operations. | T | AVCODES |
| 22 | PCA | Consolidated Rail Corp. | added 4/1976; 1/1980-1/1994; eliminated 7/1999 | | NAKINA |
| 23 | PCA | Penn Central Transportation Co., Robert W. Blanchette, Richard C. Bond and John H. McArthur, Trustees | eliminated 4/1976 | | NAKINA |
| 24 | PCA | Penn Central Transportation Co. | 1/1975 | | NAKINA |
| 25 | PCA | Penn Central Transportation Co. | Jan-75 | | NRHS |
| 26 | PCA | Penn Central Transportation Co., Robert W. Blanchette, Richard C. Bond and John H. McArthur, Trustees | eliminated 4/76 | | NRHS |
| 27 | PCA | Consolidated Rail Corp. | added 4/76; 1/80-1/94; eliminated 7/99 | | NRHS |
| 28 | PCA | *NORFOLK SOUTHERN RWY. [CONSOLIDATED RAIL CORP.; PENN CENTRAL TRANSPORTATION CO.] | | | PWRC |
| 29 | PCA | *PLANTERS COOP ASSOCIATION | | | PWRC |
| 30 | PCA | Penn Central (Norfolk Southern) | | | RSRV |
| 31 | PCAE | PACIFIC COASTAL EXPRESS | | | SCAC3 |
| 32 | PCAE | PASCAL LESSARD INC | | | SCAC4 |
| 33 | PCAF | PRECISIONAIRE INC | | | SCAC3 |
| 34 | PCAG | PENNY CARTAGE INC | | | SCAC3 |
| 35 | PCAG | PROMOTORA COMERCIAL DE LAS ARTES GR | | | SCAC4 |
| 36 | PCAI | PICARD, C A INTERNATIONAL | | | SCAC4 |
| 37 | PCAK | PAC ANCHOR TRANSPORTATION | | | SCAC4 |
| 38 | PCAL | PATRIOT CARRIERS LLC | | | SCAC4 |
| 39 | PCAM | PRICE AIRMOTIVE | | | SCAC4 |
| 40 | PCAN | PATERSON CANNING | | | SCAC3 |
| 41 | PCAO | PRO CARRIERS INC | | | SCAC4 |
| 42 | PCAP | PONCE TRANSPORT INC | | | SCAC4 |
| 43 | PCAR | PETES CUSTOM AUTO SERVICE | | | SCAC4 |
| 44 | PCAS | PACIFIC-ATLANTIC STEAMSHIP CO, | | | SCAC3 |
| 45 | PCAS | PACIFIC-ATLANTIC STEAMSHIP CO, | | | SCAC4 |
| 46 | PCAT | PACA TRANSPORT INC | | | SCAC3 |
| 47 | PCAU | GENERAL SERVICING AND TRADING LTD | | VAN | BIC |
| 48 | PCAV | PHILLIPS, J A TRUCKING LLC | | | SCAC4 |
| 49 | PCAX | Pioneer Chlor Alkali Co., Inc. | added 1/1991; 1/1994; eliminated 7/1994; added 10/1996; 7/2000; eliminated 4/2001; 7/2005 (not listed) | | NAKINA |
| 50 | PCAX | Pioneer Chlor Alkali Co., Inc. | added 1/91; 1/94; eliminated 7/94; added 10/96; 7/2000; eliminated 4/2001 | | NRHS |
| 51 | PCAX | PIONEER CHLOR ALKALI COMPANY, INC. | | | PWRC |
| 52 | PCAX | Pioneer Chlor Alkali | | | RSRV |
| 53 | PCAX | PIONEER CHLOR ALKALI COMPANY, INC. | | | SCAC4 |
| 54 | PCAY | POIRIER, CHRISTIAN TRANSPORT | | | SCAC4 |
| 55 | PCAZ | PCA INDUSTRY | | | PWRC |
| 56 | PCB | Consolidated Rail Corp. | added 4/1976; 1/1980-1/1994; eliminated 7/1999 | | NAKINA |
| 57 | PCB | Penn Central Transportation Co., Robert W. Blanchette, Richard C. Bond and John H. McArthur, Trustees | eliminated 4/1976 | | NAKINA |
| 58 | PCB | Penn Central Transportation Co. | 1/1975 | | NAKINA |
| 59 | PCB | Penn Central Transportation Co. | Jan-75 | | NRHS |
| 60 | PCB | Penn Central Transportation Co., Robert W. Blanchette, Richard C. Bond and John H. McArthur, Trustees | eliminated 4/76 | | NRHS |
| 61 | PCB | Consolidated Rail Corp. | added 4/76; 1/80-1/94; eliminated 7/99 | | NRHS |
| 62 | PCB | CONSOLIDATED RAIL CORP. [PENN CENTRAL TRANSPORTATION] | | | PWRC |
| 63 | PCB | Penn Central (Norfolk Southern) | | | RSRV |
| 64 | PCBA | PELLA CARRIER SERVICES INC | | | SCAC4 |
| 65 | PCBC | PACIFIC BASIN CARBON TRANSPORT COMP | | | SCAC3 |
| 66 | PCBC | PRINCE ALBERT TRUCKING INC | | | SCAC4 |
| 67 | PCBD | P C B DISPOSAL SYSTEMS | | | SCAC3 |
| 68 | PCBD | PACIFIC BLASTING AND DEMOLITION LTD | | | SCAC4 |
| 69 | PCBG | PEPSI-COLA METROPOLITAN BOTTLING CO | | | SCAC3 |
| 70 | PCBG | PACIFIC BULK SHIPPING LTD | | | SCAC4 |
| 71 | PCBJ | PROCTER, CLAYTON | | | SCAC4 |
| 72 | PCBK | PACIFIC OVERSEAS NO 1 BULK CARRIERS | | | SCAC3 |
| 73 | PCBN | PRITCHARD TRUCKING | | | SCAC4 |
| 74 | PCBO | PACIFIC CUSTOMS BROKERS LTD | | | SCAC4 |
| 75 | PCBP | PARAGON CARTAGE LLC | | | SCAC4 |
| 76 | PCBQ | PACIFIC BEACH TRANSFER | | | SCAC3 |
| 77 | PCBS | PACIFIC COAST BUS SERVICE INC | | | SCAC3 |
| 78 | PCBW | PEARLCOAT INC | | | SCAC4 |
| 79 | PCC | Perforadora Central, S.A. de C.V. | Callsign: Perforadora Central, | MEX | AVCODES |
| 80 | PCC | Perforadora Central | | | ICAO1 |
| 81 | PCC | Palouse River & Coulee City R.R. Inc. | 7/2000; added 4/2005; 7/2005 | | NAKINA |
| 82 | PCC | Palouse River & Coulee City R.R. Inc. | Jul-00 | | NRHS |
| 83 | PCC | PALOUSE RIVER & COULEE CITY RAILROAD | | | PWRC |
| 84 | PCC | Palouse River and Coulee City Railroad | | | RSRV |
| 85 | PCC | PALOUSE RIVER & COULEE CITY RAILROA | | | SCAC4 |
| 86 | PCC | Pittsburgh, Cincinnati, Chicago & St Louis Railroad | | USA | TRAFFIC |
| 87 | PCC | PCC Cargo GmbH | | DE | VKM |
| 88 | PCCA | PACIFIC CORRUGATED TRUCK LINES INC | | | SCAC4 |
| 89 | PCCA | | Real: PCC | PL | TRAFFIC |
| 90 | PCCB | PHOENIX CIVIL CONTRACTORS LLC | | | SCAC4 |
| 91 | PCCC | PORT CLYDE CABBUBG COMPANY | | | SCAC3 |
| 92 | PCCC | PACIFIC CENTRAL CARRIERS LTD | | | SCAC4 |
| 93 | PCCC | PCC Intermodal S.A. | | PL | VKM |
| 94 | PCCCT | DB SCHENKER RAIL COALTRAN Sp. z o.o. | | PL | VKM |
| 95 | PCCD | PACIFIC CONTAINER CARRIERS INC | | | SCAC4 |
| 96 | PCCE | PACOS CARRIER INC | | | SCAC3 |
| 97 | PCCE | PACOS CARRIER INC | | | SCAC4 |
| 98 | PCCF | PARAMOUNT COFFEE CO | | | SCAC4 |
| 99 | PCCH | PACIFIC COACHWAYS CHARTER SERVICES | | | SCAC3 |
| 100 | PCCH | PACIFIC COACHWAYS CHARTER SERVICES | | | SCAC4 |
