| 9001 | PSOX | Peerless Oil & Refining Co. | 7/1930 | | NAKINA |
| 9002 | PSOX | Puget Sound Power & Light Co. | added 1/70; 4/70-7/2000 | | NRHS |
| 9003 | PSOX | *PEERLESS OIL & REFINING CO. | | | PWRC |
| 9004 | PSOX | *PUGET SOUND POWER & LIGHT CO. | | | PWRC |
| 9005 | PSOX | Puget Sound Power and Light | | | RSRV |
| 9006 | PSOZ | PUBLIC SERVICE OF OKLAHOMA | | | PWRC |
| 9007 | PSP | Air St. Pierre, S.A. | Callsign: Saint-Pierre, | CDN | AVCODES |
| 9008 | PSP | Publiservicios Aereos, S.A. de C.V. | Callsign: Publiservicios, | MEX | AVCODES |
| 9009 | PSP | Publiservicios Aereos | | | ICAO1 |
| 9010 | PSP | Polskie Siły Powietrzne | The Polish Air Forces (Polskie Siły Powietrzne) was the name of the Polish Air Forces formed in France and the United Kingdom during World War II. | PL | TRAFFIC |
| 9011 | PSP | PETROLSPED Slovakia s.r.o. | | SK | VKM |
| 9012 | PSPC | PARAMOUNT SPECIALIZED CARRIERS | | | SCAC3 |
| 9013 | PSPE | PRODUCE SUPPLY EXPRESS INC | | | SCAC3 |
| 9014 | PSPE | PRODUCE SUPPLY EXPRESS INC | | | SCAC4 |
| 9015 | PSPF | PREMIER SECURITY PRODUCTS INC | | | SCAC4 |
| 9016 | PSPG | POTI SHIPPING CO., LTD. | | | SCAC3 |
| 9017 | PSPG | P & S PAVING INC | | | SCAC4 |
| 9018 | PSPH | PULLIAM SPECIALIZED HAULING INC | | | SCAC3 |
| 9019 | PSPH | PASTRY PLACE, THE | | | SCAC4 |
| 9020 | PSPI | PROMOTERS SUPPLY INC | | | SCAC3 |
| 9021 | PSPI | PACIFIC STATES PETROLEUM INC | | | SCAC4 |
| 9022 | PSPJ | PREMIUM SHIPPING COMPANY LIMITED | | | SCAC4 |
| 9023 | PSPL | PATTY SHIPPING PTE LTD | | | SCAC3 |
| 9024 | PSPM | PROSPERITY MARITIME CO LTD | | | SCAC3 |
| 9025 | PSPM | PROSPEROU | | | SCAC4 |
| 9026 | PSPN | PROMISES PLUS INC | | | SCAC4 |
| 9027 | PSPOZ | Państwowa Straż Pożarna | | PL | TRAFFIC |
| 9028 | PSPP | PPP SERVICES LLC | | | SCAC4 |
| 9029 | PSPR | PROPERTIES PROFESSIONAL SERVICE | | | SCAC4 |
| 9030 | PSPT | PASO PETROLEUM | | | SCAC4 |
| 9031 | PSPV | PUGET SOUND PETROLEUM | | | SCAC4 |
| 9032 | PSPW | PREFERRED TRANSPORTATION LLC | | | SCAC4 |
| 9033 | PSPX | Chevron Phillips Chemical Co., LP | added 10/2002; 7/2005 | | NAKINA |
| 9034 | PSPX | Phillips Petroleum Co. | added 10/1995; 7/2000; eliminated 10/2002 | | NAKINA |
| 9035 | PSPX | Phillips 66 Co., a Subsidiary of Phillips Petroleum Co. | added 7/1986; 1/1994; eliminated 10/1995 | | NAKINA |
| 9036 | PSPX | Phillips Petroleum Co. | 7/1937-1/1980; eliminated 7/1986 | | NAKINA |
| 9037 | PSPX | Bartex Pipe Line Co. (Phillips Petroleum Co.) | 7/1935 | | NAKINA |
| 9038 | PSPX | Phillips Petroleum Co. | 8/1920-7/1932 | | NAKINA |
| 9039 | PSPX | Phillips Petroleum Co. | 4/38-1/80; eliminated 7/86 | | NRHS |
| 9040 | PSPX | Phillips 66 Co., a Subsidiary of Phillips Petroleum Co. | added 7/86; 1/94; eliminated 10/95 | | NRHS |
| 9041 | PSPX | Phillips Petroleum Co. | added 10/95; 7/2000 | | NRHS |
| 9042 | PSPX | CHEVRON PHILLIPS CHEMICAL CO., LP [PHILLIPS PETROLEUM CO.] | | | PWRC |
| 9043 | PSPX | Phillips Petroleum | | | RSRV |
| 9044 | PSPX | PHILLIPS PETROLEUM CO | | | SCAC3 |
| 9045 | PSPX | CHEVRON PHILLIPS CHEMICAL COMPANY L | | | SCAC4 |
| 9046 | PSQ | Aviones Para Serviale, S.A. de C.V. | Callsign: Serviaviones, | MEX | AVCODES |
| 9047 | PSQB | PASQUALICHIO BROTHERS | | | SCAC3 |
| 9048 | PSQC | PSC INC | | | SCAC4 |
| 9049 | PSQH | PARADISE SHIPPING LTD. | | | SCAC3 |
| 9050 | PSQI | PARSEC INC | | | SCAC4 |
| 9051 | PSQS | P & S TRAILER SERVICE | | | SCAC4 |
| 9052 | PSQT | PACIFIC STAR TRANSPORTATION INC | | | SCAC3 |
| 9053 | PSQV | PURSE SEINER TRAVEL SERVICES | | | SCAC3 |
| 9054 | PSR | Express, Joint-Stock Aircompany | Callsign: Exavia, | RUS | AVCODES |
| 9055 | PSR | Polestar Aviation | | | ICAO1 |
| 9056 | PSR | Pittsburg & Shawmut R.R., Inc. | added 7/1996; 7/2000; eliminated 4/2004; 7/2005 | | NAKINA |
| 9057 | PSR | Petaluma & Santa Rosa R.R. Co. | 7/1965-10/1966 & 1/1975-1/1980; eliminated 10/1984 | | NAKINA |
| 9058 | PSR | Petaluma & Santa Rosa R.R. Co. | 7/65-10/66 & 1/75-1/80; eliminated 10/84 | | NRHS |
| 9059 | PSR | Pittsburg & Shawmut R.R., Inc. | added 7/96; 7/2000 | | NRHS |
| 9060 | PSR | *PETALUMA & SANTS ROSA RAILROAD CO. | | | PWRC |
| 9061 | PSR | *PITTSBURG & SHAWMUT RAILROAD | | | PWRC |
| 9062 | PSR | +BUFFALO & PITTSBURGH RAILROAD, INC. | | | PWRC |
| 9063 | PSR | Pittsburg and Shawmut Railroad | | | RSRV |
| 9064 | PSR | The Pittsburgh & Shawmut R.R. Co. | Real: PS | USA | TRAFFIC |
| 9065 | PSRE | P S R ENTERPRISES INC | | | SCAC3 |
| 9066 | PSRG | P & S TRUCKING INC | | | SCAC4 |
| 9067 | PSRJ | PSR LEASING INC | | | SCAC4 |
| 9068 | PSRK | PROSPERITY TRUCKING CO. | | | SCAC3 |
| 9069 | PSRK | PROSPERITY TRUCKING CO | | | SCAC4 |
| 9070 | PSRM | PACIFIC SOUTHWEST RAILWAY MUSEUM (SAN DIEGO RAILROAD MUSEUM) | | | PWRC |
| 9071 | PSRM | POST ROAD MOVERS | | | SCAC3 |
| 9072 | PSRO | PURSER OIL CO INC | | | SCAC4 |
| 9073 | PSRQ | PROTOSTAR LOGISTICS INC | | | SCAC4 |
| 9074 | PSRR | PACIFIC SUN RAILROAD LLC | | | SCAC4 |
| 9075 | PSRS | PATTERSON, R S | | | SCAC4 |
| 9076 | PSRU | PARATORI S.P.A. | | I | BIC |
| 9077 | PSRV | PORTSERV TRANSPORTATION COMAPNY | | | SCAC3 |
| 9078 | PSRV | PORTAL SERVICE CO INC | | | SCAC4 |
| 9079 | PSRX | Puget Sound Butter & Egg Co. (Union Refrigerator Transit Co.) | 7/1935 | | NAKINA |
| 9080 | PSRX | Puget Sound Refrigerator Line | 7/1932 | | NAKINA |
| 9081 | PSRX | *PUGET SOUND REFRIGERATOR LINE | | | PWRC |
| 9082 | PSRX | *PETALUMA & SANTA ROSA RAILROAD CO. (OUT OF OPERATION) | | | PWRC |
| 9083 | PSRY | POINTS, T R TRUCKING | | | SCAC4 |
| 9084 | PSS | TSSKB-Progress, Air Company | Callsign: Progress, Name changed to RKC Progress, Air Company | RUS | AVCODES |
| 9085 | PSS | RKC Progress, Air Company | Callsign: Progress, Name changed from TSSKB-Progress, Air Company | RUS | AVCODES |
| 9086 | PSS | TSSKB-Progress | | | ICAO1 |
| 9087 | PSSB | PASSONS SPECIALIZED SERVICE INC | | | SCAC4 |
| 9088 | PSSC | PERSON SHIPPING COMPANY LIMITED | | | SCAC3 |
| 9089 | PSSD | PETRE, STEFAN SOFTWARE AND DESIGN D | | | SCAC4 |
| 9090 | PSSE | PETERS SILVER STREAK EXPRESS LTD | | | SCAC3 |
| 9091 | PSSF | POINT STAR SEAFOODS | | | SCAC4 |
| 9092 | PSSG | PEARSONS SALVAGE INC | | | SCAC3 |
| 9093 | PSSH | PSARA SHIPPING CORP MONROVIA LIBERI | | | SCAC3 |
| 9094 | PSSJ | PSS TRANSPORTATION INC (DIV OF PRIN | | | SCAC3 |
| 9095 | PSSJ | P S S TRANSPORTATION INC (DIV OF PS | | | SCAC4 |
| 9096 | PSSK | PISCES TRUCKING INC | | | SCAC4 |
| 9097 | PSSN | PASSMORE, A & SONS INC | | | SCAC3 |
| 9098 | PSSO | PHOENIX SPECIALTY SOLUTIONS INC | | | SCAC4 |
| 9099 | PSSP | PROTOS STEAMSHIP PTE LTD | | | SCAC3 |
| 9100 | PSSP | PASSPORT PLUS FREIGHT COMPANY | | | SCAC4 |
