| 1 | PW | Precision Air Services Ltd. | ICAO: PRF, Callsign: Precision Air, | EAT | AVCODES |
| 2 | PW | German Wings Luftfahrtunternehman GmbH | ICAO: KFK, Callsign: German Wings, Ceased operations. Name changed to Air Flight Luftfahrt GmbH | D | AVCODES |
| 3 | PW | Pacific Western Airlines | ICAO: PWA, Callsign: Pacific Western, ICAO callsign changed to Pac West | CDN | AVCODES |
| 4 | PW | Pine State Airlines | Designator PW* surrendered by Airline | USA | AVCODES |
| 5 | PW | Pacific Western Airlines | ICAO: PWA, Callsign: Pac West, Bought CP Air and merged to form Canadian Airlines International. ICAO callsign changed from Pacific Western | CDN | AVCODES |
| 6 | PW | Providence and Worcester R.R. Co. | added 4/1981; 1/1994-7/2005 | | NAKINA |
| 7 | PW | Providence and Worcester Co. | added 4/1973; 1/1975-1/1980; eliminated 4/1981 | | NAKINA |
| 8 | PW | Providence and Worcester Co. | added 4/73; 1/75-1/80; eliminated 4/81 | | NRHS |
| 9 | PW | Providence and Worcester R.R. Co. | added 4/81; 1/94-7/2000 | | NRHS |
| 10 | PW | PROVIDENCE & WORCESTER RAILROAD CO. | | | PWRC |
| 11 | PW | Providence and Worcester Railroad | | | RSRV |
| 12 | PW | Providence & Worcester Railroad Company | | USA | TRAFFIC |
| 13 | PW&V | Pittsburgh & West Virginia Ry. (Norfolk and Western Ry.) | Apr-70 | | NRHS |
| 14 | PW&V | Pittsburgh & West Virginia Ry. | 4/38-7/65 | | NRHS |
| 15 | PW&V | Norfolk and Western Ry. Co. | Oct-66 | | NRHS |
| 16 | PWA | Priester Aviation | Callsign: Priester, | USA | AVCODES |
| 17 | PWA | Pacific Western Airlines | IATA: PW, Callsign: Pacific Western, ICAO callsign changed to Pac West | CDN | AVCODES |
| 18 | PWA | Pacific Western Airlines | IATA: PW, Callsign: Pac West, Bought CP Air and merged to form Canadian Airlines International. ICAO callsign changed from Pacific Western | CDN | AVCODES |
| 19 | PWA | Priester Aviation | | | ICAO1 |
| 20 | PWAB | PARKWAY AUTO BROKERS INC | | | SCAC3 |
| 21 | PWAC | PARKER, WILLIAM ASSOCIATES INC | | | SCAC3 |
| 22 | PWAF | PARKVIEW COLONY FARMS LTD | | | SCAC4 |
| 23 | PWAH | PREMIER WAREHOUSING | | | SCAC4 |
| 24 | PWAI | PACIFIC WESTERN AIRMOTIVE INC | | | SCAC3 |
| 25 | PWAL | POWELL, A L COMPANIES INC | | | SCAC4 |
| 26 | PWALB | PKS Wałbrzych | | PL | TRAFFIC |
| 27 | PWALCZ | PKS Sp. z o.o. Wałcz | | PL | TRAFFIC |
| 28 | PWAO | PAC WEST AUCTIONS | | | SCAC3 |
| 29 | PWAO | POWER TWO THOUSAND (2000) TRANSPORT | | | SCAC4 |
| 30 | PWAQ | PORKWAY FARMS LTD | | | SCAC4 |
| 31 | PWAR | POSTON WAREHOUSES INC | | | SCAC3 |
| 32 | PWAR | PWA CROPPS INC | | | SCAC4 |
| 33 | PWAT | POWELL, A L TRUCKING INC | | | SCAC3 |
| 34 | PWAT | PORT WATCH TRANSPORTATION INC | | | SCAC4 |
| 35 | PWAY | PENN WAY EXPRESS INC | | | SCAC3 |
| 36 | PWAY | PENNWAY EXPRESS INC | | | SCAC4 |
| 37 | PWBS | PARKWAY BUS SERVICE | | | SCAC3 |
| 38 | PWBT | PATTON, WILLIAM B TOWING CO | | | SCAC3 |
| 39 | PWBT | PACIFIC WEST COAST TRANSPORTATION L | | | SCAC4 |
| 40 | PWC | Pratt And Whitney Canada, Inc. | Callsign: Pratt, | CDN | AVCODES |
| 41 | PWC | Pratt and Whitney Canada | | | ICAO1 |
| 42 | PWCG | POWER & CONSTRUCTION GROUP INC | | | SCAC4 |
| 43 | PWCH | POWELL CHRISTENSEN INC | | | SCAC3 |
| 44 | PWCI | PILGRIM WAREHOUSE AND CARTAGE INC | | | SCAC3 |
| 45 | PWCO | PRAWER, S & CO | | | SCAC3 |
| 46 | PWCO | POWER LOGISTICS CO | | | SCAC4 |
| 47 | PWCQ | P W C INTERNATIONAL | | | SCAC4 |
| 48 | PWCR | PRO-WEST CONTRACTORS LLC | | | SCAC4 |
| 49 | PWCS | POWERCART SYSTEMS INC | | | SCAC4 |
| 50 | PWCT | PERFORMANCE WORLD CUSTOM CAR & TRUC | | | SCAC4 |
| 51 | PWCU | PORT WAL TRANSPORTES MARITIMOS | | | SCAC3 |
| 52 | PWCU | PORT WAL TRANSPORTES MARITIMOS | | | SCAC4 |
| 53 | PWCX | Inland Cement Ltd. | 7/2000-7/2005 (not listed) | | NAKINA |
| 54 | PWCX | Inland Cement Ltd. | Jul-00 | | NRHS |
| 55 | PWCX | INLAND CEMENT LIMITED | | | PWRC |
| 56 | PWCX | Inland Cement Limited | | | RSRV |
| 57 | PWD | Pan Am World Airways Dominicana, CXA | IATA: 7N, Callsign: Pawa, IATA Prefix: 185, Operations suspended on 28 January 2018. | DOM | AVCODES |
| 58 | PWD | Pan Am World Airways | | | ICAO1 |
| 59 | PWDB | POWELL DISTRIBUTING CO | | | SCAC4 |
| 60 | PWDC | POINTS WEST DRAYAGE CO | | | SCAC3 |
| 61 | PWDJ | POWELL, D J INC | | | SCAC3 |
| 62 | PWDL | PORT WASHINGTON DE LUX TAXI INC | | | SCAC3 |
| 63 | PWDR | POWER DRAFT | | | SCAC4 |
| 64 | PWDS | PAN WEST DISTRIBUTORS DIV OF PAN WE | | | SCAC4 |
| 65 | PWDT | P W D TRANSPORT | | | SCAC3 |
| 66 | PWDT | POWELL, DARYL TRUCKING | | | SCAC4 |
| 67 | PWEC | PEE WEE TRANSPORT/COURIER | | | SCAC3 |
| 68 | PWEE | POWELL ENTERPRISES | | | SCAC3 |
| 69 | PWEI | POWER EXPRESS INC | | | SCAC3 |
| 70 | PWEN | POWERS ENTERPRISE | | | SCAC3 |
| 71 | PWEQ | POWER EXPRESS INC | | | SCAC4 |
| 72 | PWES | P & W ENTERPRISES INC | | | SCAC3 |
| 73 | PWEY | PRO-WHEELS EXPRESS INC | | | SCAC4 |
| 74 | PWF | Private Wings Flugcharter GmbH | IATA: 8W, Callsign: Private Wings, Designator 8W* recellad by IATA. | D | AVCODES |
| 75 | PWF | Private Wings Flugcharter GmbH | Callsign: Private Wings, Designator 8W* recellad by IATA. | D | AVCODES |
| 76 | PWF | Private Wings Flugcharter | IATA: 8W | | ICAO1 |
| 77 | PWFA | PACIFIC WILD FISHING INC | | | SCAC4 |
| 78 | PWFN | PROCARGO EXPRESS INC | | | SCAC4 |
| 79 | PWFP | PWF | | | SCAC4 |
| 80 | PWFR | POWER FREIGHT SYSTEMS | | | SCAC4 |
| 81 | PWFS | POWERLINE FREIGHT SYSTEMS INC | | | SCAC3 |
| 82 | PWFS | POWERLINE FREIGHT SYSTEMS INC | | | SCAC4 |
| 83 | PWFT | POWELL FREIGHT TRANSPORTATION | | | SCAC3 |
| 84 | PWFV | POWER FREIGHT SERVICES INC | | | SCAC4 |
| 85 | PWFW | POWERFLOW PRODUCTS LIMITED | | | SCAC4 |
| 86 | PWFX | Port Rail Services, Inc. | 7/2005 (not listed) | | NAKINA |
| 87 | PWFX | PORT RAIL SERVICES, INC. | | | PWRC |
| 88 | PWFX | Port Rail Services | | | RSRV |
| 89 | PWFX | PORT RAIL SERVICES INC | | | SCAC4 |
| 90 | PWHC | PINNACLE WAREHOUSE & TRANSPORTATION | | | SCAC3 |
| 91 | PWHD | Przedsiêbiorstwo Wielobranzowe Henryk Dyrda | | PL | TRAFFIC |
| 92 | PWHQ | PACIFIC WAREHOUSE CO | | | SCAC3 |
| 93 | PWIA | PARKER, WILLIAM | | | SCAC4 |
| 94 | PWIC | POWER TRANSPORTATION SERVICES INC | | | SCAC4 |
| 95 | PWID | P & W INDUSTRIES INC | | | SCAC3 |
| 96 | PWID | PRIME WOODCRAFT INC | | | SCAC4 |
| 97 | PWII | PORTER WARNER INDUSTRIES INC | | | SCAC3 |
| 98 | PWIJ | PORT WAY INC | | | SCAC4 |
| 99 | PWIN | PROWLER INC | | | SCAC4 |
| 100 | PWIQ | PRIME WORLDWIDE INC | | | SCAC4 |
