| 1 | PA | Florida Coastal Airlines, Inc. | ICAO: FCL, Callsign: Florida Coastal, | USA | AVCODES |
| 2 | PA | Pan American World Airways (Pan-Am) | ICAO: PAA, Callsign: Clipper, Name changed from Pan American Airways in January 1950. Ceased operations on 04 December 1991. | USA | AVCODES |
| 3 | PA | Pan Am II | ICAO: PXA, Callsign: Clipper, Ceased operations on 26 February 1998. | USA | AVCODES |
| 4 | PA | M/S Airblue (PVT) Ltd | ICAO: ABQ, Callsign: Pakblue, IATA Prefix: 084, | PK | AVCODES |
| 5 | PA | Pan American | | USA | TRAFFIC |
| 6 | PA&M | Pittsburgh, Allegheny & McKees Rocks R.R. (Co.) | 7/1923-10/1966 | | NAKINA |
| 7 | PA&M | Pittsburgh, Allegheny & McKees Rocks R.R. | 4/38-10/66 | | NRHS |
| 8 | PA&M | PITTSBURGH, ALLEGHENY & MCKEES ROCKS RAILROAD CO. | | | PWRC |
| 9 | PAA | Pan American Airways Corp. | IATA: PN, Callsign: Clipper, | USA | AVCODES |
| 10 | PAA | Pan American World Airways (Pan-Am) | IATA: PA, Callsign: Clipper, Name changed from Pan American Airways in January 1950. Ceased operations on 04 December 1991. | USA | AVCODES |
| 11 | PAA | Pan American World Airways | IATA: PA | | ICAO1 |
| 12 | PAA | Pan American Airways | IATA: PA | | ICAO1 |
| 13 | PAA | CONSOLIDATED RAIL CORP. [PENNSYLVANIA & ATLANTIC RAILROAD CO.] | | | PWRC |
| 14 | PAA | PORR-ALPINE Austriarail GmbH | | AT | VKM |
| 15 | PAAA | PARRA, ALFONSO | | | SCAC3 |
| 16 | PAAB | P & A TRANSPORT LLC | | | SCAC4 |
| 17 | PAAC | PORT AUTHORITY OF ALLEGHENY COUNTY (PENNSYLVANIA) | | | PWRC |
| 18 | PAAC | PAN AMERICAN CLIPPER PACKAGE SERVIC | | | SCAC4 |
| 19 | PAAE | PALMER, ARTHUR E | | | SCAC4 |
| 20 | PAAF | PILOT AIR FREIGHT CORP | | | SCAC4 |
| 21 | PAAM | PARCEL TANKERS SERVICES INC | | | SCAC3 |
| 22 | PAAM | PARCEL TANKERS SERVICES INC | | | SCAC4 |
| 23 | PAAN | P & A TRANSPORTATION | | | SCAC3 |
| 24 | PAAN | PAYNE, ANTHONY | | | SCAC4 |
| 25 | PAAP | PARR LUMBER CO | | | SCAC4 |
| 26 | PAAQ | PLANTS AND ANIMALS | | | SCAC4 |
| 27 | PAAU | PT JASATAMA KEMASINDO | | | SCAC4 |
| 28 | PAAV | PAN AMERICAN VAN LINES INC | | | SCAC3 |
| 29 | PAAW | PATTON & ASSOCIATES | | | SCAC3 |
| 30 | PAB | Pacific Air Boats Ltd. | Callsign: Air Boats, | CDN | AVCODES |
| 31 | PAB | Silkline Air | Name changed to Parair | TJ | AVCODES |
| 32 | PAB | Parair | Callsign: Parair, Name changed from Silkline Air | TJ | AVCODES |
| 33 | PAB | Pacific Air Boats | | | ICAO1 |
| 34 | PABA | PATS BAGGAGE TRANSFER | | | SCAC3 |
| 35 | PABA | PACIFIC LOG RECOVERY SYSTEMS LTD | | | SCAC4 |
| 36 | PABB | PETERS & BARBARA | | | SCAC3 |
| 37 | PABC | P & B TRUCKING COMPANY | | | SCAC3 |
| 38 | PABC | PACIFIC VOYAGES INC | | | SCAC4 |
| 39 | PABCO | PABCO Transit Inc. | | USA | TRAFFIC |
| 40 | PABF | PAC TRUCKING CO INC | | | SCAC4 |
| 41 | PABH | PATLEE TRANSPORT | | | SCAC4 |
| 42 | PABI | PRECISION AUTOMATION CO INC | | | SCAC4 |
| 43 | PABI | Miejski Zakład Komunikacyjny Pabianice sp. z o.o. | | PL | TRAFFIC |
| 44 | PABJ | P A B JR INC | | | SCAC3 |
| 45 | PABK | P A B TRUCKING CO | | | SCAC3 |
| 46 | PABK | PACBRAKE COMPANY | | | SCAC4 |
| 47 | PABM | PELLETIER, ALBERT THE MOVER INC | | | SCAC3 |
| 48 | PABN | PRAIRIE ADVERTISING LTD | | | SCAC4 |
| 49 | PABO | R & B CARTAGE & WAREHOUSE INC | | | SCAC3 |
| 50 | PABO | PAQUETERIA Y CARGA DEL NORTE | | | SCAC4 |
| 51 | PABP | PANACEA AFTERMARKET CO | | | SCAC4 |
| 52 | PABQ | PACIFIC ATLANTIC REFRIGERATED | | | SCAC4 |
| 53 | PABV | PACIFIC BEVERAGE CO | | | SCAC3 |
| 54 | PABV | PACIFIC INTERNATIONAL LINES (PTE) L | | | SCAC4 |
| 55 | PAC | Polar Air Cargo, Inc. | IATA: PO, Callsign: Polar, IATA Prefix: 403, Name changed to Polar Air Cargo Worldwide, Inc. ICAO Callsign changed from Polar Tiger | USA | AVCODES |
| 56 | PAC | Polar Air Cargo, Inc. | IATA: PO, Callsign: Polar Tiger, IATA Prefix: 403, ICAO Callsign changed to Polar | USA | AVCODES |
| 57 | PAC | Polar Air Cargo Worldwide, Inc. | IATA: PO, Callsign: Polar, IATA Prefix: 403, Name changed from Polar Air Cargo, Inc. ICAO Callsign changed from Polar Tiger | USA | AVCODES |
| 58 | PAC | Polar Air Cargo | IATA: PO | | ICAO1 |
| 59 | PAC | Polar Air Cargo | Real: PAC, PO | USA | TRAFFIC |
| 60 | PACA | PREMIER AIR CARGO SALES & LOGISTICS | | | SCAC4 |
| 61 | PACB | PACIFIC BULK TRANSPORTATION CO | | | SCAC3 |
| 62 | PACB | PACIFIC BULK TRANSPORTATION CO INC | | | SCAC4 |
| 63 | PACD | PACIFIC ATLANTIC COASTAL EXPRESS | | | SCAC3 |
| 64 | PACE | PACE TRANSPORTATION INC | | | SCAC4 |
| 65 | PACE | PACE (Chicago, Ill.) | | USA | TRAFFIC |
| 66 | PACF | PUGLIESE AND COMPANY | | | SCAC4 |
| 67 | PACG | PACIFIC TRANSPORTATION GROUP INC | | | SCAC3 |
| 68 | PACG | PACIFIC GREEN INC | | | SCAC4 |
| 69 | PACH | PRIORITY AIR CHARTER LLC | | | SCAC4 |
| 70 | PACI | PACIFIC CHEMICALS INDUSTRIES | | | PWRC |
| 71 | PACI | PACIFIC SEABRIDGE | | | SCAC3 |
| 72 | PACI | PACIFIC ENDEAVOR SHIPPING INC | | | SCAC4 |
| 73 | PACJ | P A C OCEAN LINES | | | SCAC4 |
| 74 | PACN | PACIFIC INTERNATIONAL FREIGHT SYSTE | | | SCAC3 |
| 75 | PACO | PARCEL DELIVERY SERVICE | | | SCAC3 |
| 76 | PACP | PACIFIC AGRI-PRODUCTS INC | | | SCAC3 |
| 77 | PACQ | PACIFIC EXPRESS | | | SCAC3 |
| 78 | PACS | PACIFIC STORAGE COMPANY | | | SCAC3 |
| 79 | PACS | PACIFIC STORAGE COMPANY | | | SCAC4 |
| 80 | PACSA | Pacific Sky Aviation | | CDN | TRAFFIC |
| 81 | PACU | XPO LOGISTICS | | USA | BIC |
| 82 | PACU | Pacer International | | | RSRV |
| 83 | PACU | PACE LINE (PACIFIC AMERICA CONTAINE | | | SCAC3 |
| 84 | PACU | PACER STACKTRAIN | | | SCAC4 |
| 85 | PACV | PACIFIC VAN & STORAGE CO INC | | | SCAC3 |
| 86 | PACV | PIEDMONT AVIATION COMPONENT | | | SCAC4 |
| 87 | PACW | PAC-EX | | | SCAC4 |
| 88 | PACX | Plasser American Corp. | 1/1994-7/2005 (not listed) | | NAKINA |
| 89 | PACX | Pacific Supply Cooperative | added 10/1974; 1/1975; eliminated 1/1978 | | NAKINA |
| 90 | PACX | Pacific Supply Cooperative | added 10/74; 1/75; eliminated 1/78 | | NRHS |
| 91 | PACX | Plasser American Corp. | 1/94-7/2000 | | NRHS |
| 92 | PACX | PLASSER AMERICAN CORP. | | | PWRC |
| 93 | PACX | Plasser American Corporation | | | RSRV |
| 94 | PACX | PLASSER AMERICAN CORPORATION | | | SCAC4 |
| 95 | PACY | Prairie Central Ry. Co. | added 10/1981; eliminated 1/1986 | | NAKINA |
| 96 | PACY | Prairie Central Ry. Co. | added 10/81; eliminated 1/86 | | NRHS |
| 97 | PACY | PRAIRIE CENTRAL RAILWAY CO. | | | PWRC |
| 98 | PACY | Prairie Central Railway | | | RSRV |
| 99 | PACZ | PAPER CALMENSON & CO. | | | PWRC |
| 100 | PAD | Professional Express Courier Service, Inc. | Callsign: Air Professional, | USA | AVCODES |
