| 1 | PS | Ukraine International Airlines | {ICAO: AUI, Callsign: Ukraine International, IATA Prefix: 566, Name changed to Private Stock Company "Ukraine International Airlines"};SRCKEY=AVCODES | UA | |
| 2 | PS | Private Stock Company "Ukraine International Airlines" | ICAO: AUI, Callsign: Ukraine International, IATA Prefix: 566, Name changed from Ukraine International Airlines | UA | AVCODES |
| 3 | PS | European Cargo Limited | ICAO: URO, Callsign: Euro, IATA Prefix: 436, IATA designator changed to SE. | GB | AVCODES |
| 4 | PS | The Pittsburgh & Shawmut R.R. Co. | 1/1975-1/1994; eliminated 7/1996; 7/2000-7/2005 | | NAKINA |
| 5 | PS | The Pittsburgh & Shawmut R.R. Co. | 1/75-1/94; eliminated 7/96; 7/2000 | | NRHS |
| 6 | PS | PITTSBURG & SHAWMUT RAILROAD | | | PWRC |
| 7 | PS | Pittsburg and Shawmut Railroad | | | RSRV |
| 8 | PS | PITTSBURG & SHAWMUT RAILROAD | | | SCAC4 |
| 9 | PS | Pécsi Közlekedési RT | City: Pécs | H | TRAFFIC |
| 10 | PSA | Pacific Island Aviation, Inc. | IATA: 9J, Callsign: Pacific Isle, IATA Prefix: 321, Founded in 1997. Commenced operations in August 1988. Ceased operations on 09 February 2005. | MP | AVCODES |
| 11 | PSA | Pacific Island Aviation | | | ICAO1 |
| 12 | PSAB | PACIFIC SCIENTIFIC TRANSPORT | | | SCAC4 |
| 13 | PSAC | P S ASSOCIATES INCORPORATED | | | SCAC3 |
| 14 | PSAD | PORTILLO & SONS TRANSPORTATION | | | SCAC4 |
| 15 | PSAF | PREMIER CARRIERS | | | SCAC4 |
| 16 | PSAG | PENINSULAR SHIP AGENCIES INC. | | | SCAC3 |
| 17 | PSAH | PETRO SOURCE TRANSPORTATION LLC | | | SCAC4 |
| 18 | PSAI | POWER STAR ASSOCIATES | | | SCAC4 |
| 19 | PSAL | PETROLEUM SALES | | | SCAC3 |
| 20 | PSAP | The Puget Sound & Pacific R.R. Co. | 7/2000-7/2005 | | NAKINA |
| 21 | PSAP | The Puget Sound & Pacific R.R. Co. | Jul-00 | | NRHS |
| 22 | PSAP | PUGET SOUND & PACIFIC RAILROAD | | | PWRC |
| 23 | PSAP | Puget Sound and Pacific Railroad | | | RSRV |
| 24 | PSAP | PUGET SOUND & PACIFIC RAILROAD COMP | | | SCAC4 |
| 25 | PSAS | POSTA, A TRANSFER INC | | | SCAC4 |
| 26 | PSAT | PALMETTO STATE TRANSPORTATION CO | | | SCAC3 |
| 27 | PSAV | PACHECO SERVICES LLC | | | SCAC4 |
| 28 | PSAW | PETROPUMA SA | | | SCAC4 |
| 29 | PSAZ | PACIFIC NORTHWEST PERISHABLE SHIPPERS ASSN.,INC. | | | PWRC |
| 30 | PSAZ | Pacific Northwest Perishable Shippers Association | | | RSRV |
| 31 | PSAZ | PACIFIC NORTHWEST PERISHABLE SHIPPE | | | SCAC4 |
| 32 | PSB | Syrian Pearl Airlines | IATA: PI, | SYR | AVCODES |
| 33 | PSBC | POLAND SPRING BOTTLING CORP | | | SCAC3 |
| 34 | PSBD | PACIFIC SPECIALTY BRANDS | | | SCAC4 |
| 35 | PSBE | PERISHABLE EXPRESS, THE | | | SCAC3 |
| 36 | PSBL | PALUSKI BOATS LIMITED | | | SCAC4 |
| 37 | PSBN | PSB & SONS TRANSPORT INC | | | SCAC4 |
| 38 | PSBP | PRIME SOURCE BUILDING PRODUCTS INC | | | SCAC4 |
| 39 | PSBR | PITTSBURGH INTERMODAL TERMINALS INC | | | SCAC4 |
| 40 | PSBS | PETERSON SBS | | | SCAC4 |
| 41 | PSBT | PEL-STATE BULK PLANT LLC | | | SCAC4 |
| 42 | PSBU | CONTSHIP | | | PWRC |
| 43 | PSBU | Contship | | | RSRV |
| 44 | PSBU | CONTSHIP | | | SCAC3 |
| 45 | PSBU | CP SHIPS | | | SCAC4 |
| 46 | PSBV | P. S. B. TRUCKING, INC | | | SCAC3 |
| 47 | PSBX | Pacific States Railcar Co. | added 1/1974; 1/1975-1/1994; eliminated 4/1998 | | NAKINA |
| 48 | PSBX | Pacific States Railcar Co. | added 1/74; 1/75-1/94; eliminated 4/98 | | NRHS |
| 49 | PSBX | *PACIFIC STATES RAILCAR COMPANY | | | PWRC |
| 50 | PSBX | +POWER ASSET RECOVERY CORP. | | | PWRC |
| 51 | PSBX | POWER ASSET RECOVERY CORPORATION | | | SCAC4 |
| 52 | PSC | Pascan Aviation Inc. | IATA: P6, Callsign: Pascan, Name changed to 9736140 Canada Inc. t/a Pascan | CDN | AVCODES |
| 53 | PSC | 9736140 Canada Inc t/a Pascan | IATA: P6, Callsign: Pascan, Name changed from Pascan Aviation Inc. | CDN | AVCODES |
| 54 | PSC | Pascan Aviation | | | ICAO1 |
| 55 | PSC | PYCO INDUSTRIES INC. | | | PWRC |
| 56 | PSC | PYCO INDUSTRIES INC | | | SCAC4 |
| 57 | PSCA | PANTHEON SHIPPING COMPANY S A | | | SCAC3 |
| 58 | PSCA | PANTHEON SHIPPING COMPANY S A | | | SCAC4 |
| 59 | PSCB | PERMAN STOLER CUSTOMHOUSE BROKER | | | SCAC3 |
| 60 | PSCB | PETROLEUM SERVICES COMPANY LLC | | | SCAC4 |
| 61 | PSCC | Pennsylvania & Southern Ry. LLC | 7/2005 | | NAKINA |
| 62 | PSCC | PENNSYLVANIA & SOUTHERN RWY. LLC | | | PWRC |
| 63 | PSCC | PERSONAL COURIER CORP | | | SCAC3 |
| 64 | PSCC | PENNSYLVANIA & SOUTHERN RAILWAY LLC | | | SCAC4 |
| 65 | PSCF | PACKARD SPECIALIZED CARRIERS INC | | | SCAC4 |
| 66 | PSCG | PRESIDENT STORAGE CO INC | | | SCAC3 |
| 67 | PSCH | PACIFIC STATE CHARTER | | | SCAC3 |
| 68 | PSCH | PLASTICRAFT SIGNS AND GRAPHICS | | | SCAC4 |
| 69 | PSCI | PUBLIC SERVICE COMPANY OF INDIANA | | | PWRC |
| 70 | PSCI | PRESTIGIOUS CARRIER INC | | | SCAC3 |
| 71 | PSCK | PESCHKE TRUCKING | | | SCAC4 |
| 72 | PSCL | PUGET SOUND COACH LINES | | | SCAC3 |
| 73 | PSCL | PROGRESSIVE SWEEPING CONTRACTORS IN | | | SCAC4 |
| 74 | PSCM | PRESCOTT MOTORS INC | | | SCAC3 |
| 75 | PSCN | PERAMOS SHIPPING COMPANY LIMITED, P | | | SCAC3 |
| 76 | PSCN | PARISO, CARMEN M INC | | | SCAC4 |
| 77 | PSCP | PALLET SUPPLY COMPANY INC | | | SCAC3 |
| 78 | PSCQ | PEERLESS STORAGE CO, THE | | | SCAC3 |
| 79 | PSCR | PASSAIC TERMINAL & TRANSPORTATION C | | | SCAC3 |
| 80 | PSCS | PINE SHIPPING CO., INC | | | SCAC3 |
| 81 | PSCT | PRIMEAU, SCOTT | | | SCAC4 |
| 82 | PSCT | Public Service Coordinated Transportation Company | | US-NJ | TRAFFIC |
| 83 | PSCU | CARU CONTAINERS BV | | NL | BIC |
| 84 | PSCU | PIET SCHOUTEN CONTAINERHANDEL BV | | | SCAC3 |
| 85 | PSCU | SCHOUTEN CONTAINER SERVICES (SCS) | | | SCAC4 |
| 86 | PSCV | PRESTO COURIER SERVICE | | | SCAC3 |
| 87 | PSCX | Xcel Energy | added 1/2006; eliminated 1/2008 | | NAKINA |
| 88 | PSCX | Public Service Co. of Colorado | added 4/1973; 1/1975-7/2000; eliminated 10/2002; 7/2005 (not listed) | | NAKINA |
| 89 | PSCX | Prolerized Steel Corp. | added 7/1960; 4/1961-10/1966; eliminated 10/1969 | | NAKINA |
| 90 | PSCX | Prolerized Steel Corp. | added 7/60; 4/61-10/66; eliminated 10/69 | | NRHS |
| 91 | PSCX | Public Service Co. of Colorado | added 4/73; 1/75-1/80 | | NRHS |
| 92 | PSCX | Public Services Co. of Colorado | 1/94-7/2000 | | NRHS |
| 93 | PSCX | *PROLERIZED STEEL CORP. | | | PWRC |
| 94 | PSCX | +XCEL ENERGY [PUBLIC SERVICE COMPANY OF COLORADO] | | | PWRC |
| 95 | PSCX | Public Service of Colorado | | | RSRV |
| 96 | PSCX | PROLERIZED STEEL CORP | | | SCAC3 |
| 97 | PSCX | XCEL ENERGY | | | SCAC4 |
| 98 | PSCY | PEARLNYPMH SHIPPING LTD. | | | SCAC3 |
| 99 | PSCZ | XCEL ENERGY [PUBLIC SERVICE COMPANY OF COLORADO] | | | PWRC |
| 100 | PSD | President Airlines | IATA: TO, IATA Prefix: 540, Desginator TO reinstated by IATA | K | AVCODES |
