| 7601 | PPU | Peoria & Pekin Union Ry. Co. | 7/65-7/2000 | | NRHS |
| 7602 | PPU | TAZEWELL & PEORIA RAILROAD [PEORIA & PEKIN UNION RAILWAY CO.] | | | PWRC |
| 7603 | PPU | Peoria and Pekin Union Railway | | | RSRV |
| 7604 | PPU | Peoria and Pekin Union | | USA | TRAFFIC |
| 7605 | PPUD | PAPPYS PICKUP & DELIVERY | | | SCAC3 |
| 7606 | PPUP | PEGASUS PICK-UP AND DELIVERY SERVIC | | | SCAC3 |
| 7607 | PPUQ | PERSONALIZED PICK-UP SERVICE, INC | | | SCAC3 |
| 7608 | PPUQ | PERSONALIZED PICK-UP SERVICE | | | SCAC4 |
| 7609 | PPV | Petropavlovsk, CJSC | Callsign: Pavlovsk, | RUS | AVCODES |
| 7610 | PPVL | PARK PLACE VAN LINES LLC | | | SCAC4 |
| 7611 | PPVT | PIEDMONT PROVISIONS TRUCKING INC | | | SCAC4 |
| 7612 | PPW | Royal Phnom Penh Airways | IATA: RL, Callsign: Phnom-Penh Air, | K | AVCODES |
| 7613 | PPW | Royal Phnom Penh Airways | IATA: RL | | ICAO1 |
| 7614 | PPWC | POWELLCO INC | | | SCAC3 |
| 7615 | PPWX | Pacific Wholesale Poultry Co. | 7/1954; eliminated 10/1954 | | NAKINA |
| 7616 | PPWX | PACIFIC WHOLESALE POULTRY CO. | | | PWRC |
| 7617 | PPX | Pioneer Products Co. | 4/1947-1/1952; eliminated 7/1953 | | NAKINA |
| 7618 | PPX | Pittsburg Provision & Packing Co. | 8/1920-7/1932 | | NAKINA |
| 7619 | PPX | Pioneer Products Co. | Jan-52 | | NRHS |
| 7620 | PPX | *PITTSBURG PROVISION & PACKING CO. | | | PWRC |
| 7621 | PPX | *PIONEER PRODUCTS CO. | | | PWRC |
| 7622 | PPX | Pelham Parkway Express | | US-NY | TRAFFIC |
| 7623 | PPXA | P P X | | | SCAC4 |
| 7624 | PPXC | PIPER TRANS LLC | | | SCAC4 |
| 7625 | PPXN | PROMP TRANS INC | | | SCAC4 |
| 7626 | PPXO | PROPACE TRANSPORT INC | | | SCAC4 |
| 7627 | PPXR | PIPER TRANSPORTATION | | | SCAC4 |
| 7628 | PPYG | PREKOOKEANSKA PLOVIDA | | | SCAC3 |
| 7629 | PQ | PTL Luftfahrtunternehmen GmbH. | ICAO: KST, Callsign: King Star, Designator PQ recalled by IATA | D | AVCODES |
| 7630 | PQ | Air Transafrik Limited | ICAO: TRF, Callsign: Transafrik, Designator PQ recalled by IATA | GH | AVCODES |
| 7631 | PQ | Tashkent Aircraft Production Corporation | ICAO: CTP, Callsign: Cortas, IATA designator changed to 4C* | UZ | AVCODES |
| 7632 | PQ | Bogazici Hava Tasimacilik A.S. | ICAO: BHT, Callsign: Basfir, | TR | AVCODES |
| 7633 | PQ | Tropical International Airways Ltd. | ICAO: TKX, Callsign: Tropexpress, Designator PQ recalled by IATA | SKN | AVCODES |
| 7634 | PQ | Panafrican Airways | ICAO: PNF, Callsign: Panways, | CI | AVCODES |
| 7635 | PQ | Puerto Rico International Airlines, Inc. | Callsign: Prinair, | PRI | AVCODES |
| 7636 | PQ | Aerosur Paraguay S.A. | ICAO: AES, Callsign: Aeroparaguay, IATA Prefix: 682, Ceased operations on 01 July 2012. Name changed from Aero Regional Paraguaya S.A. | PY | AVCODES |
| 7637 | PQ | AirAsia, Inc. Philippines | ICAO: APG, Callsign: Cool Red, IATA Prefix: 062, Merged with Philippines AirAsia Inc. (Z2/EZD) in January 2016. | RP | AVCODES |
| 7638 | PQ | SkyUp Airlines | ICAO: SQP, Callsign: Skyup, IATA Prefix: 010, ICAO code changed from KUP w.e.f. 17 August 2018. | UA | AVCODES |
| 7639 | PQA | Pacific Coast Airlines | Callsign: Sage Brush, | USA | AVCODES |
| 7640 | PQA | Pacific Coast Airlines | IATA: ID, Callsign: Sage Brush, | USA | AVCODES |
| 7641 | PQA | Pacific Coast Airlines | | | ICAO1 |
| 7642 | PQAR | PAQUETTE, A R & CO | | | SCAC3 |
| 7643 | PQAR | PAQUETTE, A R & CO | | | SCAC4 |
| 7644 | PQBK | PRO QUO BOOKS | | | SCAC4 |
| 7645 | PQC | Chieftain Airways plc | Callsign: Chieftain, | GB | AVCODES |
| 7646 | PQCC | PETROLEUM CARRIERS LLC | | | SCAC4 |
| 7647 | PQCG | PETROEAST COMPRESSED GASSES LLC | | | SCAC4 |
| 7648 | PQCL | PRINCIPAL CONTAINER LINE | | | SCAC3 |
| 7649 | PQCX | The PQ Corp. | added 4/1980; 1/1994; eliminated 1/1995; 7/2000-7/2005 (not listed) | | NAKINA |
| 7650 | PQCX | PQ Corp. | added 4/1978; 1/1980; eliminated 4/1980 | | NAKINA |
| 7651 | PQCX | Philadelphia Quartz Co. | added 1/1971; 1/1975; eliminated 4/1978 | | NAKINA |
| 7652 | PQCX | Philadelphia Quartz Co. of California | 8/1920-7/1923 | | NAKINA |
| 7653 | PQCX | Philadelphia Quartz Co. of California, Ltd. | 7/1930-4/1970; eliminated 1/1971 | | NAKINA |
| 7654 | PQCX | Philadelphia Quartz Co. of California, Ltd. | 4/38-4/70; eliminated 1/71 | | NRHS |
| 7655 | PQCX | Philadelphia Quartz Co. | added 1/71; 1/75; eliminated 4/78 | | NRHS |
| 7656 | PQCX | PQ Corp. | added 4/78; 1/80; eliminated 4/80; 7/2000 | | NRHS |
| 7657 | PQCX | The PQ Corp. | added 4/80; 1/94; eliminated 1/95; 7/2000 | | NRHS |
| 7658 | PQCX | (PQX) PQ CORPORATION [PHILADELPHIA QUARTZ CO.] | | | PWRC |
| 7659 | PQCX | PQ Corporation | | | RSRV |
| 7660 | PQCX | PHILADELPHIA QUARTZ COMPANY OF CALI | | | SCAC3 |
| 7661 | PQCX | PQ CORPORATION | | | SCAC4 |
| 7662 | PQEL | PETROFIL TANK LINES | | | SCAC4 |
| 7663 | PQEN | PENA TRUCKING SERVICES INC | | | SCAC4 |
| 7664 | PQFC | PAQUET & FAUCHER | | | SCAC4 |
| 7665 | PQFD | PENQUITO FOODS | | | SCAC4 |
| 7666 | PQIS | PRESQUE ISLE TRUCKING CO INC | | | SCAC3 |
| 7667 | PQIU | UNITAS CONTAINERS LIMITED | | BM | BIC |
| 7668 | PQKA | PETKA SHIPPING COMPANY LIMITED | | | SCAC3 |
| 7669 | PQKA | PRESSLINE EQUIPMENT | | | SCAC4 |
| 7670 | PQKL | PATROKLOS SHIPPING COMPANY LIMITED | | | SCAC3 |
| 7671 | PQKR | PARKER, MIKE TRUCKING CO | | | SCAC4 |
| 7672 | PQLI | PARLI TRUCKING | | | SCAC3 |
| 7673 | PQLV | PLITVICE SHIPPING COMPANY LIMITED | | | SCAC3 |
| 7674 | PQMR | PREMIER TRANSPORTATION LLC | | | SCAC4 |
| 7675 | PQNQ | PIQUNIQ MANAGEMENT CORPORATION | | | SCAC3 |
| 7676 | PQOL | PHILI-ORIENT LINES LTD | | | SCAC3 |
| 7677 | PQON | PRO OIL INC | | | SCAC4 |
| 7678 | PQOS | PARENTES OIL SERVICE INC | | | SCAC4 |
| 7679 | PQOT | PRICE, O L TRUCKING INC | | | SCAC4 |
| 7680 | PQRE | PRECISION GROUP | | | SCAC4 |
| 7681 | PQRL | PEQUIGNOT, R & L TRUCKING | | | SCAC3 |
| 7682 | PQRQ | P R S TRANSIT | | | SCAC4 |
| 7683 | PQRR | PORRONE TRANSPORT | | | SCAC4 |
| 7684 | PQRY | PROACTIVE RECYCLING INC | | | SCAC4 |
| 7685 | PQSC | PELJESAC SHIPPING COMPANY LIMITED | | | SCAC3 |
| 7686 | PQSH | PROSE SHIPPING LIMITED | | | SCAC3 |
| 7687 | PQSI | PRESTRESSED SYSTEMS INC | | | SCAC4 |
| 7688 | PQSS | PRO-SPEED SHIPPING INC MONTEREY PAR | | | SCAC3 |
| 7689 | PQTC | PTC | | | SCAC4 |
| 7690 | PQTE | PAQUET ET FILS LTEE | | | SCAC4 |
| 7691 | PQTI | PDQ TRANSPORT INC | | | SCAC3 |
| 7692 | PQTK | PARMER TRUCKING CO LLC | | | SCAC4 |
| 7693 | PQTR | PRO TRANSPORT INC | | | SCAC4 |
| 7694 | PQTS | PORT TRANSPORT INC | | | SCAC4 |
| 7695 | PQUN | PETROQUIN TRANSPORT INC | | | SCAC4 |
| 7696 | PQX | The PQ Corp | added 4/1980; 1/1994-7/2005 | | NAKINA |
| 7697 | PQX | PQ Corp | added 4/1978; 1/1980; eliminated 4/1980 | | NAKINA |
| 7698 | PQX | Philadelphia Quartz Co. | 8/1920; 7/1930-1/1975; eliminated 4/1978 | | NAKINA |
| 7699 | PQX | Philadelphia Quartz Co. | 4/38-1/75; eliminated 4/78 | | NRHS |
| 7700 | PQX | PQ Corp | added 4/78; 1/80; eliminated 4/80 | | NRHS |
