| 1 | PR | Philippine Airlines, Inc. | ICAO: PAL, Callsign: Philippine, IATA Prefix: 079, Name changed from Philippine Air Lines, Inc. (PAL). ICAO callsgin changed from Filairline | RP | AVCODES |
| 2 | PR | Philippine Air Lines, Inc. (PAL) | ICAO: PAL, Callsign: Filairline, IATA Prefix: 079, Name changed to Philippine Airlines, Inc. ICAO Callsign changed to Philippine | RP | AVCODES |
| 3 | PR | PANAMA RAILROAD | | | PWRC |
| 4 | PR | Preussische (KPEV) | Real: KPEV | D | TRAFFIC |
| 5 | PR | Pakistan Railways | | PK | VKM |
| 6 | PR&P | Portland Ry. Light & Power Co. (O.W.P. and Mt. Hood Div.) | 8/1920-7/1923 | | NAKINA |
| 7 | PR&P | PORTLAND RWY. LIGHT & POWER CO., O.W.P. & MT. HOOD DIV. | | | PWRC |
| 8 | PRA | Flyair | Callsign: Prima, | E | AVCODES |
| 9 | PRA | Provence Aero Service | Callsign: Airpass, | F | AVCODES |
| 10 | PRA | Pars Aviation Service | | | ICAO1 |
| 11 | PRA | Holcim (Česko) a.s., člen koncernu | | CZ | VKM |
| 12 | PRAA | PEARL REEF OYSTER CO | | | SCAC4 |
| 13 | PRAB | PRICE, ALBERT E, INC | | | SCAC3 |
| 14 | PRAB | Peterson Rail AB | 2007 - 2012 | S | svenska-lok.se |
| 15 | PRAB | Peterson Rail AB | 2007 - 2012 | S | TRAFFIC |
| 16 | PRAB | Peterson Rail AB | | SE | VKM |
| 17 | PRAC | PRAXAIR CANADA INC | | | SCAC4 |
| 18 | PRAD | PATS RADIATOR SERVICE LTD | | | SCAC4 |
| 19 | PRAF | PRECISION AIR FREIGHT | | | SCAC3 |
| 20 | PRAF | PRENDERGAST, RICK TRUCKING | | | SCAC4 |
| 21 | PRAG | PREMIER AG CO OP INC | | | SCAC4 |
| 22 | PRAG | Dopravní podnik hl. m. Prahy | Real: DPP, City: Praha | CZ | TRAFFIC |
| 23 | PRAGA | | | CZ | TRAFFIC |
| 24 | PRAH | PRESTIN, ALBERT E | | | SCAC3 |
| 25 | PRAH | PROSSER, ALBERT S TRANSPORT | | | SCAC4 |
| 26 | PRAI | PRESTERA TRUCKING CO INC | | | SCAC3 |
| 27 | PRAI | PRESTERA TRUCKING CO INC | | | SCAC4 |
| 28 | PRAIL | Port Rail OOD | | BG | VKM |
| 29 | PRAK | PROCKNAL & KATRA TRUCKING CO INC | | | SCAC3 |
| 30 | PRAL | PRICE, A L INC | | | SCAC3 |
| 31 | PRAN | PRANGE, LESTER M INC | | | SCAC3 |
| 32 | PRAO | PREVOST, ARLINGTON A | | | SCAC3 |
| 33 | PRAO | PREMIER MILLWORK | | | SCAC4 |
| 34 | PRAP | PRATER ENTERPRISES INC | | | SCAC3 |
| 35 | PRAQ | PRATT TRUCKING | | | SCAC3 |
| 36 | PRAQ | PRATT TRUCKING (ELLEN E PRATT D/B/A | | | SCAC4 |
| 37 | PRAR | PRATT TRANSPORTATION CO INC | | | SCAC3 |
| 38 | PRAS | PRINCETON ARMORED SERVICE INC | | | SCAC3 |
| 39 | PRAS | PROLINE AG SERVICE INC | | | SCAC4 |
| 40 | PRAU | PARATORI S.P.A. | | I | BIC |
| 41 | PRAU | PRADON | | | SCAC3 |
| 42 | PRAU | PRADA AMERICAS CUP S R L | | | SCAC4 |
| 43 | PRAW | PRIMO TRUCKING INC | | | SCAC4 |
| 44 | PRAX | First Union Rail | added 7/1996; 7/2000-7/2005 | | NAKINA |
| 45 | PRAX | Pacific Rail Leasing Corp. | added 7/1991; 1/1994; eliminated 7/1996 | | NAKINA |
| 46 | PRAX | Pacific Rail Leasing Corp. | added 7/91; 1/94; eliminated 7/96 | | NRHS |
| 47 | PRAX | First Union Rail | added 7/96; 7/2000 | | NRHS |
| 48 | PRAX | *PREMIER AG | | | PWRC |
| 49 | PRAX | +FIRST UNION RAIL [PACIFIC RAIL LEASING CORPORATION] | | | PWRC |
| 50 | PRAX | Pacific Rail Leasing Corp (First Union Rail) | | | RSRV |
| 51 | PRB | Proteus Airlines | IATA: YS, Callsign: Proteus, IATA Prefix: 977, Name changed to Regional Compagnie Aerienne Europeene on 30 March 2001. | F | AVCODES |
| 52 | PRB | Regional Compagnie Aerienne Europeene | IATA: YS, Callsign: Proteus, IATA Prefix: 977, Formed from merger of Proteus Airlines, Flandre Air, and Regional Airlines. | F | AVCODES |
| 53 | PRB | Puerto Rico Air Management Services, Inc | Callsign: Prams Air, | PRI | AVCODES |
| 54 | PRB | Peusse Baubetriebe GmbH | | DE | VKM |
| 55 | PRBA | PRO-ABRASIV | | | SCAC4 |
| 56 | PRBC | PERNO BUS CO INC | | | SCAC3 |
| 57 | PRBD | PARKERSBURG DELIVERY SERVICE | | | SCAC3 |
| 58 | PRBD | PRO BEL ENTERPRISES LTD | | | SCAC4 |
| 59 | PRBE | P R B ENTERPRISES INC | | | SCAC3 |
| 60 | PRBE | PARISIEN, ROBERT ERNEST OR JOAN ELI | | | SCAC4 |
| 61 | PRBG | PHOENIX REEDEREI BEREEDERUNGS GMBH | | | SCAC4 |
| 62 | PRBI | PRINCE BROS INC | | | SCAC3 |
| 63 | PRBL | PIONEER BUS LINES | | | SCAC3 |
| 64 | PRBM | PROFREIGHT CONTAINER LINES | | | SCAC4 |
| 65 | PRBN | PREMIUM BEST TRANSPORT | | | SCAC4 |
| 66 | PRBO | PARKE BROS TRUCKING INC | | | SCAC3 |
| 67 | PRBR | PRISCO MOVING AND STORAGE INC | | | SCAC3 |
| 68 | PRBT | PENSKE RACING INC | | | SCAC4 |
| 69 | PRBT | PREBET AIUD SA | | RO | VKM |
| 70 | PRBU | PRS PASSIVE REFRIGERATION SOLUTIONS S.A. | | CH | BIC |
| 71 | PRBV | PRICE BROTHERS TRANSPORTATION SERVI | | | SCAC3 |
| 72 | PRBX | Trinity Rail Management, Inc. | added 7/1997; 7/2000-7/2005 | | NAKINA |
| 73 | PRBX | Transcisco Leasing Co. | added 7/1994; eliminated 7/1997 | | NAKINA |
| 74 | PRBX | Producers & Refiners Corp. | 8/1920 | | NAKINA |
| 75 | PRBX | Transcisco Leasing Co. | added 7/94; eliminated 7/97 | | NRHS |
| 76 | PRBX | Trinity Rail Management, Inc. | added 7/97; 7/2000 | | NRHS |
| 77 | PRBX | *PRODUCERS & REFINERS CORP. | | | PWRC |
| 78 | PRBX | +TRINITY RAIL MANAGEMENT INCORPORATED [(MCHX) TRANSCISCO LEASING CO.] | | | PWRC |
| 79 | PRBX | Trinity Rail Management | | | RSRV |
| 80 | PRBX | TRINITY RAIL MANAGEMENT | | | SCAC4 |
| 81 | PRC | Pacific Air Charter, Inc. | Callsign: Pacific Charter, | USA | AVCODES |
| 82 | PRC | Pacific Air Charter | | | ICAO1 |
| 83 | PRC | Pakistan Rail Company | | PK | TRAFFIC |
| 84 | PRCA | PARISO, CARMEN M INC | | | SCAC3 |
| 85 | PRCA | PREMIER CARRIER INC | | | SCAC4 |
| 86 | PRCB | PRECISION BULK TRANSPORT INC | | | SCAC3 |
| 87 | PRCB | PEARCE, RICHARD TRUCKING LTD | | | SCAC4 |
| 88 | PRCC | PRICE, C E JR | | | SCAC3 |
| 89 | PRCF | PROCHNOW FARMS INC | | | SCAC3 |
| 90 | PRCF | PROCHNOW TRANSPORT INC | | | SCAC4 |
| 91 | PRCG | PEARCE CARTAGE LIMITED | | | SCAC3 |
| 92 | PRCG | PEARCE CARTAGE LIMITED | | | SCAC4 |
| 93 | PRCI | PRIDE TRANSPORTATION CO INC | | | SCAC3 |
| 94 | PRCJ | PRINCE, JOHN TRANSPORTATION INC | | | SCAC3 |
| 95 | PRCK | PORT TRUCKING COMPANY | | | SCAC3 |
| 96 | PRCK | PRESSEAULT, R TRUCKING | | | SCAC4 |
| 97 | PRCL | PIERCE TRUCKING | | | SCAC3 |
| 98 | PRCL | PRESIDENT CONTAINER LINE | | | SCAC4 |
| 99 | PRCM | PINE REST CHRISTIAN MENTAL HEALTH S | | | SCAC4 |
| 100 | PRCN | PRINTCO INC | | | SCAC3 |
