| 7701 | PQX | The PQ Corp | added 4/80; 1/94-7/2000 | | NRHS |
| 7702 | PQX | PQ CORPORATION [PHILADELPHIA QUARTZ CO.] | | | PWRC |
| 7703 | PQX | PQ Corporation | | | RSRV |
| 7704 | PQX | PQ CORPORATION | | | SCAC4 |
| 7705 | 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 |
| 7706 | 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 |
| 7707 | PR | PANAMA RAILROAD | | | PWRC |
| 7708 | PR | Preussische (KPEV) | Real: KPEV | D | TRAFFIC |
| 7709 | PR | Pakistan Railways | | PK | VKM |
| 7710 | PR&P | Portland Ry. Light & Power Co. (O.W.P. and Mt. Hood Div.) | 8/1920-7/1923 | | NAKINA |
| 7711 | PR&P | PORTLAND RWY. LIGHT & POWER CO., O.W.P. & MT. HOOD DIV. | | | PWRC |
| 7712 | PRA | Flyair | Callsign: Prima, | E | AVCODES |
| 7713 | PRA | Provence Aero Service | Callsign: Airpass, | F | AVCODES |
| 7714 | PRA | Pars Aviation Service | | | ICAO1 |
| 7715 | PRA | Holcim (Česko) a.s., člen koncernu | | CZ | VKM |
| 7716 | PRAA | PEARL REEF OYSTER CO | | | SCAC4 |
| 7717 | PRAB | PRICE, ALBERT E, INC | | | SCAC3 |
| 7718 | PRAB | Peterson Rail AB | 2007 - 2012 | S | svenska-lok.se |
| 7719 | PRAB | Peterson Rail AB | 2007 - 2012 | S | TRAFFIC |
| 7720 | PRAB | Peterson Rail AB | | SE | VKM |
| 7721 | PRAC | PRAXAIR CANADA INC | | | SCAC4 |
| 7722 | PRAD | PATS RADIATOR SERVICE LTD | | | SCAC4 |
| 7723 | PRAF | PRECISION AIR FREIGHT | | | SCAC3 |
| 7724 | PRAF | PRENDERGAST, RICK TRUCKING | | | SCAC4 |
| 7725 | PRAG | PREMIER AG CO OP INC | | | SCAC4 |
| 7726 | PRAG | Dopravní podnik hl. m. Prahy | Real: DPP, City: Praha | CZ | TRAFFIC |
| 7727 | PRAGA | | | CZ | TRAFFIC |
| 7728 | PRAH | PRESTIN, ALBERT E | | | SCAC3 |
| 7729 | PRAH | PROSSER, ALBERT S TRANSPORT | | | SCAC4 |
| 7730 | PRAI | PRESTERA TRUCKING CO INC | | | SCAC3 |
| 7731 | PRAI | PRESTERA TRUCKING CO INC | | | SCAC4 |
| 7732 | PRAIL | Port Rail OOD | | BG | VKM |
| 7733 | PRAK | PROCKNAL & KATRA TRUCKING CO INC | | | SCAC3 |
| 7734 | PRAL | PRICE, A L INC | | | SCAC3 |
| 7735 | PRAN | PRANGE, LESTER M INC | | | SCAC3 |
| 7736 | PRAO | PREVOST, ARLINGTON A | | | SCAC3 |
| 7737 | PRAO | PREMIER MILLWORK | | | SCAC4 |
| 7738 | PRAP | PRATER ENTERPRISES INC | | | SCAC3 |
| 7739 | PRAQ | PRATT TRUCKING | | | SCAC3 |
| 7740 | PRAQ | PRATT TRUCKING (ELLEN E PRATT D/B/A | | | SCAC4 |
| 7741 | PRAR | PRATT TRANSPORTATION CO INC | | | SCAC3 |
| 7742 | PRAS | PRINCETON ARMORED SERVICE INC | | | SCAC3 |
| 7743 | PRAS | PROLINE AG SERVICE INC | | | SCAC4 |
| 7744 | PRAU | PARATORI S.P.A. | | I | BIC |
| 7745 | PRAU | PRADON | | | SCAC3 |
| 7746 | PRAU | PRADA AMERICAS CUP S R L | | | SCAC4 |
| 7747 | PRAW | PRIMO TRUCKING INC | | | SCAC4 |
| 7748 | PRAX | First Union Rail | added 7/1996; 7/2000-7/2005 | | NAKINA |
| 7749 | PRAX | Pacific Rail Leasing Corp. | added 7/1991; 1/1994; eliminated 7/1996 | | NAKINA |
| 7750 | PRAX | Pacific Rail Leasing Corp. | added 7/91; 1/94; eliminated 7/96 | | NRHS |
| 7751 | PRAX | First Union Rail | added 7/96; 7/2000 | | NRHS |
| 7752 | PRAX | *PREMIER AG | | | PWRC |
| 7753 | PRAX | +FIRST UNION RAIL [PACIFIC RAIL LEASING CORPORATION] | | | PWRC |
| 7754 | PRAX | Pacific Rail Leasing Corp (First Union Rail) | | | RSRV |
| 7755 | PRB | Proteus Airlines | IATA: YS, Callsign: Proteus, IATA Prefix: 977, Name changed to Regional Compagnie Aerienne Europeene on 30 March 2001. | F | AVCODES |
| 7756 | 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 |
| 7757 | PRB | Puerto Rico Air Management Services, Inc | Callsign: Prams Air, | PRI | AVCODES |
| 7758 | PRB | Peusse Baubetriebe GmbH | | DE | VKM |
| 7759 | PRBA | PRO-ABRASIV | | | SCAC4 |
| 7760 | PRBC | PERNO BUS CO INC | | | SCAC3 |
| 7761 | PRBD | PARKERSBURG DELIVERY SERVICE | | | SCAC3 |
| 7762 | PRBD | PRO BEL ENTERPRISES LTD | | | SCAC4 |
| 7763 | PRBE | P R B ENTERPRISES INC | | | SCAC3 |
| 7764 | PRBE | PARISIEN, ROBERT ERNEST OR JOAN ELI | | | SCAC4 |
| 7765 | PRBG | PHOENIX REEDEREI BEREEDERUNGS GMBH | | | SCAC4 |
| 7766 | PRBI | PRINCE BROS INC | | | SCAC3 |
| 7767 | PRBL | PIONEER BUS LINES | | | SCAC3 |
| 7768 | PRBM | PROFREIGHT CONTAINER LINES | | | SCAC4 |
| 7769 | PRBN | PREMIUM BEST TRANSPORT | | | SCAC4 |
| 7770 | PRBO | PARKE BROS TRUCKING INC | | | SCAC3 |
| 7771 | PRBR | PRISCO MOVING AND STORAGE INC | | | SCAC3 |
| 7772 | PRBT | PENSKE RACING INC | | | SCAC4 |
| 7773 | PRBT | PREBET AIUD SA | | RO | VKM |
| 7774 | PRBU | PRS PASSIVE REFRIGERATION SOLUTIONS S.A. | | CH | BIC |
| 7775 | PRBV | PRICE BROTHERS TRANSPORTATION SERVI | | | SCAC3 |
| 7776 | PRBX | Trinity Rail Management, Inc. | added 7/1997; 7/2000-7/2005 | | NAKINA |
| 7777 | PRBX | Transcisco Leasing Co. | added 7/1994; eliminated 7/1997 | | NAKINA |
| 7778 | PRBX | Producers & Refiners Corp. | 8/1920 | | NAKINA |
| 7779 | PRBX | Transcisco Leasing Co. | added 7/94; eliminated 7/97 | | NRHS |
| 7780 | PRBX | Trinity Rail Management, Inc. | added 7/97; 7/2000 | | NRHS |
| 7781 | PRBX | *PRODUCERS & REFINERS CORP. | | | PWRC |
| 7782 | PRBX | +TRINITY RAIL MANAGEMENT INCORPORATED [(MCHX) TRANSCISCO LEASING CO.] | | | PWRC |
| 7783 | PRBX | Trinity Rail Management | | | RSRV |
| 7784 | PRBX | TRINITY RAIL MANAGEMENT | | | SCAC4 |
| 7785 | PRC | Pacific Air Charter, Inc. | Callsign: Pacific Charter, | USA | AVCODES |
| 7786 | PRC | Pacific Air Charter | | | ICAO1 |
| 7787 | PRC | Pakistan Rail Company | | PK | TRAFFIC |
| 7788 | PRCA | PARISO, CARMEN M INC | | | SCAC3 |
| 7789 | PRCA | PREMIER CARRIER INC | | | SCAC4 |
| 7790 | PRCB | PRECISION BULK TRANSPORT INC | | | SCAC3 |
| 7791 | PRCB | PEARCE, RICHARD TRUCKING LTD | | | SCAC4 |
| 7792 | PRCC | PRICE, C E JR | | | SCAC3 |
| 7793 | PRCF | PROCHNOW FARMS INC | | | SCAC3 |
| 7794 | PRCF | PROCHNOW TRANSPORT INC | | | SCAC4 |
| 7795 | PRCG | PEARCE CARTAGE LIMITED | | | SCAC3 |
| 7796 | PRCG | PEARCE CARTAGE LIMITED | | | SCAC4 |
| 7797 | PRCI | PRIDE TRANSPORTATION CO INC | | | SCAC3 |
| 7798 | PRCJ | PRINCE, JOHN TRANSPORTATION INC | | | SCAC3 |
| 7799 | PRCK | PORT TRUCKING COMPANY | | | SCAC3 |
| 7800 | PRCK | PRESSEAULT, R TRUCKING | | | SCAC4 |
