| 7501 | PPPT | PICO PETROLEUM PRODUCTS | | | SCAC4 |
| 7502 | PPPU | PEIPPO OY | | | SCAC3 |
| 7503 | PPPX | Pepin Pickling Co. | 7/1935-7/1954; eliminated 10/1956 | | NAKINA |
| 7504 | PPPX | Pepin Pickling Co. | 4/38-1/52 | | NRHS |
| 7505 | PPPX | PEPIN PICKLING CO. | | | PWRC |
| 7506 | PPPY | PEARCE PETROLEUM PRODUCTS | | | SCAC4 |
| 7507 | PPPZ | PLEASANT PRAIRIE POWER PLANT | | | PWRC |
| 7508 | PPQ | Personas Y Paquetes Por Aire, S.A. de C.V. | Callsign: Personaspaq, | MEX | AVCODES |
| 7509 | PPQ | Personas Y Pasquetes Por Air | | | ICAO1 |
| 7510 | PPR | Propstar Aviation Ltd | Callsign: Propstar, | GB | AVCODES |
| 7511 | PPRC | PAPER RECOVERY OF SAN DIEGO INC | | | SCAC3 |
| 7512 | PPRE | PLEASANT PAPER RECYCLING INC | | | SCAC4 |
| 7513 | PPRF | PORT IMPERIAL FERRY | | | SCAC3 |
| 7514 | PPRG | PULIDO, P TRUCKING | | | SCAC4 |
| 7515 | PPRI | PENN PRIDE INC | | | SCAC4 |
| 7516 | PPRK | P & P TRUCKING INC | | | SCAC4 |
| 7517 | PPRL | PHILPOT RELOCATION SYSTEMS | | | SCAC4 |
| 7518 | PPRQ | PAPER TRANSPORT COMPANY, THE | | | SCAC3 |
| 7519 | PPRR | PARADISE & PACIFIC RAILROAD | | | PWRC |
| 7520 | PPRS | PEPPERS TRANSPORT INC | | | SCAC4 |
| 7521 | PPRX | ConocoPhillips Co. | added 10/2003; 7/2005 | | NAKINA |
| 7522 | PPRX | Phillips Petroleum Co. | added 1/2001; eliminated 10/2003 | | NAKINA |
| 7523 | PPRX | Potash Reduction Co., Inc. | 8/1920-7/1923 | | NAKINA |
| 7524 | PPRX | Phillips Petroleum Co. | added 1/2001 | | NRHS |
| 7525 | PPRX | *POTASH REDUCTION CO., INC. | | | PWRC |
| 7526 | PPRX | +CONOCOPHILLIPS CO. [PHILLIPS PETROLEUM COMPANY] | | | PWRC |
| 7527 | PPRX | Phillips Petroleum | | | RSRV |
| 7528 | PPRX | CONOCOPHILLIPS COMPANY | | | SCAC4 |
| 7529 | PPRY | PORT OF PORT ROYAL INC | | | SCAC3 |
| 7530 | PPS | Butte Aviation, Inc. | Callsign: Pipestone, | USA | AVCODES |
| 7531 | PPS | Butte Aviation | | | ICAO1 |
| 7532 | PPSB | PREFERRED PINE STRAW INC | | | SCAC4 |
| 7533 | PPSC | PIEDMONT PAPER STOCK CO INC | | | SCAC3 |
| 7534 | PPSC | PAULSON PREMIUM SEED & CONDITIONING | | | SCAC4 |
| 7535 | PPSD | PARRA PONCE, SERGIO RICARDO | | | SCAC4 |
| 7536 | PPSE | POOL PRODUCTION SERVICES INC | | | SCAC3 |
| 7537 | PPSF | POST POINT SEAFOOD INC | | | SCAC4 |
| 7538 | PPSG | PARAPOLA SHIPPING CORP | | | SCAC3 |
| 7539 | PPSI | PIONEER PAPER STOCK | | | SCAC3 |
| 7540 | PPSI | PACIFIC PROSPECT SHIPPING INC | | | SCAC4 |
| 7541 | PPSJ | PAW PAW'S HAULING | | | SCAC4 |
| 7542 | PPSM | PIPE SUEZMAX CORPORATION | | | SCAC4 |
| 7543 | PPSP | PURPLESTAR EXPRESS CORP | | | SCAC4 |
| 7544 | PPSS | PLATAOU PACIFIC SHIPPING SERVICES | | | SCAC3 |
| 7545 | PPSS | PENINSULA PLASTICS LTD | | | SCAC4 |
| 7546 | PPSSK | Prvá prepravná spoločnosť, s.r.o. | | SK | VKM |
| 7547 | PPST | PAPPAS TRUCKING INC | | | SCAC3 |
| 7548 | PPST | PEPST TRUCKING INC | | | SCAC4 |
| 7549 | PPSU | NEPTUNE PACIFIC LINE PTE LTD | | NZ | BIC |
| 7550 | PPSU | POLYNESIAN SHIPPING LINE SAMOA LIMI | | | SCAC4 |
| 7551 | PPSV | PREFERRRED PETROLEUM SERVICES INC | | | SCAC4 |
| 7552 | PPSX | Pioneer Pipe & Supply Co., Inc. | 7/2000-7/2005 (not listed) | | NAKINA |
| 7553 | PPSX | Pacific Portland Cement Co. | 4/1938-1/1941; 1/1943 (not listed) | | NAKINA |
| 7554 | PPSX | Pacific Portland Cement Co. | Apr-38 | | NRHS |
| 7555 | PPSX | Pioneer Pipe & Supply Co., Inc. | Jul-00 | | NRHS |
| 7556 | PPSX | *PACIFIC PORTLAND CEMENT CO. | | | PWRC |
| 7557 | PPSX | *PIONEER PIPE AND SUPPLY COMPANY | | | PWRC |
| 7558 | PPSX | Pioneer Pipe and Supply | | | RSRV |
| 7559 | PPSZCZ | PKS Pszczyna | | PL | TRAFFIC |
| 7560 | PPT | Pro Patria Air Ltd. | Callsign: Propatria, | H | AVCODES |
| 7561 | PPT | Patria Pilot Training Oy | | FIN | AVCODES |
| 7562 | PPTA | P & P TRANSPORTATION SERVICES INC | | | SCAC3 |
| 7563 | PPTB | PIED PIPER TOURS INC | | | SCAC3 |
| 7564 | PPTB | PEPPERTHORNE BOOKS | | | SCAC4 |
| 7565 | PPTC | PAPER TRANSPORT CO | | | SCAC3 |
| 7566 | PPTC | PEAK PERFORMANCE TRANSPORTATION LLC | | | SCAC4 |
| 7567 | PPTD | PASADENA PETROLEUM TRANSPORT CORP | | | SCAC3 |
| 7568 | PPTE | PEPPERS TRUCKING SOUTHERN STYLE LLC | | | SCAC4 |
| 7569 | PPTH | PREMIER PRO TRANS S A DE C V (MX-45 | | | SCAC4 |
| 7570 | PPTI | PETROLEUM PRODUCTS TRANSPORTATION | | | SCAC3 |
| 7571 | PPTI | PIPER TRUCKING | | | SCAC4 |
| 7572 | PPTJ | PALMETTO PETROLEUM TRANSPORTS INC | | | SCAC3 |
| 7573 | PPTK | PAPAS TRUCKING | | | SCAC3 |
| 7574 | PPTK | PIPHER TRUCKING LTD | | | SCAC4 |
| 7575 | PPTL | PPT INC | | | SCAC3 |
| 7576 | PPTM | PRIME PETROLEUM CORP | | | SCAC4 |
| 7577 | PPTN | POPE TRANSPORT COMPANY | | | SCAC3 |
| 7578 | PPTN | POPE TRANSPORT COMPANY | | | SCAC4 |
| 7579 | PPTO | PAW PAW TRUCKING CO | | | SCAC3 |
| 7580 | PPTO | PENN PALLET TRUCKING LLC | | | SCAC4 |
| 7581 | PPTP | P & P TRANSPORT | | | SCAC3 |
| 7582 | PPTQ | PIN-POINT TRANSPORT LLC | | | SCAC4 |
| 7583 | PPTR | P & P TRUCKING CORPORATION | | | SCAC3 |
| 7584 | PPTS | PRODUCERS PRODUCE TRANSIT CO | | | SCAC3 |
| 7585 | PPTT | P & P TRUCKING | | | SCAC3 |
| 7586 | PPTU | TANKGUARD B.V. | | NL | BIC |
| 7587 | PPTU | SNOEK & VAN TIGGELEN HOLDING BV | | | SCAC4 |
| 7588 | PPTV | P & P TRANSPORT | | | SCAC3 |
| 7589 | PPTW | PIPES TOW | | | SCAC3 |
| 7590 | PPTW | PRAIRIE PROMISE 4TH | | | SCAC4 |
| 7591 | PPTX | PCS Phosphate Co., Inc. | added 10/1997; 7/2000-7/2005 | | NAKINA |
| 7592 | PPTX | PCS Phosphate Co., Inc. | added 10/97; 7/2000 | | NRHS |
| 7593 | PPTX | PCS PHOSPHATE COMPANY | | | PWRC |
| 7594 | PPTX | PCS Phosphate | | | RSRV |
| 7595 | PPTX | PCS PHOSPHATE COMPANY, INC. | | | SCAC4 |
| 7596 | PPTY | PPT TRANSPORTATION SERVICE | | | SCAC3 |
| 7597 | PPU | Polish Air Navigation Services Agency | Callsign: Papuga, | PL | AVCODES |
| 7598 | PPU | Tazewell & Peoria R.R. | added 4/2005; 7/2005 | | NAKINA |
| 7599 | PPU | Tazewell & Pekin R.R. | added 1/2005 | | NAKINA |
| 7600 | PPU | Peoria & Pekin Union Ry. Co. | 7/1965-7/2000; eliminated 1/2005; eliminated 4/2005 | | NAKINA |
