| 3301 | PFXR | PACIFIC FREIGHT EXPRESS | | | SCAC4 |
| 3302 | PFXS | PFX PET SUPPLY | | | SCAC4 |
| 3303 | PFXT | PROFEX TRANSPORTATION SERVICES INC | | | SCAC3 |
| 3304 | PFY | Pel-Air Aviation Pty Ltd | Callsign: Pelflight, | AUS | AVCODES |
| 3305 | PFYC | PILOT FREIGHT SYSTEMS INC | | | SCAC4 |
| 3306 | PFYM | PERFORMANCE TEAM FREIGHT SYSTEM INC | | | SCAC3 |
| 3307 | PFYR | PREFERRED DELIVERY SERVICE INC | | | SCAC3 |
| 3308 | PFYR | PRAIRIE FLYERS INC | | | SCAC4 |
| 3309 | PFZ | Proflight Commuter Services Limited | IATA: P0, Callsign: Proflight-Zambia, | Z | AVCODES |
| 3310 | PFZ | Proflight Commuter Services Limited | IATA: P0, Callsign: Proflight-Zambia, | Z | AVCODES |
| 3311 | PFZ | Propflight Air Services | | | ICAO1 |
| 3312 | PFZE | PEL FREEZ ARKANSAS LLC | | | SCAC4 |
| 3313 | PG | Bangkok Airways Co. Ltd. | ICAO: BKP, Callsign: Bangkok Air, IATA Prefix: 829, | T | AVCODES |
| 3314 | PG | Aero Spacelines | Callsign: Aerospace, | USA | AVCODES |
| 3315 | PG | Air Gabon Cargo | Callsign: Gaboncargo, | G | AVCODES |
| 3316 | PG | PROCTOR & GAMBLE | | | PWRC |
| 3317 | PGA | Portugalia | IATA: NI | | ICAO1 |
| 3318 | PGAA | PEGASUS LOGISTICS GROUP | | | SCAC4 |
| 3319 | PGAB | PAGE & BARNHILL TRUCKING INC | | | SCAC3 |
| 3320 | PGAC | PETER GUNN AUTO SALES & LEASING INC | | | SCAC4 |
| 3321 | PGAD | PGA DELIVERY SERVICE INC | | | SCAC3 |
| 3322 | PGAD | PINZGAUER CANADA | | | SCAC4 |
| 3323 | PGAM | PEP GAS | | | SCAC4 |
| 3324 | PGAO | PRESTIGE AUTO TRANSPORT | | | SCAC4 |
| 3325 | PGAR | PARTNERS BULK LOGISTICS | | | SCAC4 |
| 3326 | PGAS | PERMAGAS INC | | | SCAC3 |
| 3327 | PGAU | PAN-GULF LOGISTICS LTD | | | SCAC4 |
| 3328 | PGAX | Continental Tank Car Corp. | added 1/1979; eliminated 10/1979; 1/1980 | | NAKINA |
| 3329 | PGAX | Pressure Tank Car Co. | added 1/1964; 7/1965-1/1975; eliminated 1/1979 | | NAKINA |
| 3330 | PGAX | Pressure Tank Car Co. | 7/65-1/75; eliminated 1/79 | | NRHS |
| 3331 | PGAX | Continental Tank Car Corp. | added 1/79; 1/80 | | NRHS |
| 3332 | PGAX | CONTINENTAL TANK CAR CORP. [PRESSURE TANK CAR CO.] | | | PWRC |
| 3333 | PGAX | PRESSURE TANK CAR CO | | | SCAC3 |
| 3334 | PGBC | PIGGYBACKCONSOLIDATORS INC | | | SCAC3 |
| 3335 | PGBC | PIGGYBACKCONSOLIDA | | | SCAC4 |
| 3336 | PGBI | PAGE BUS COMPANY INC | | | SCAC3 |
| 3337 | PGBJ | PAPER TRANSPORT OF GREEN BAY INC (J | | | SCAC4 |
| 3338 | PGBP | PIGGYBACK PLUS | | | SCAC3 |
| 3339 | PGBQ | PIGGYBACK SERVICE CO | | | SCAC3 |
| 3340 | PGBS | PENTAGON BUS SERVICE INC | | | SCAC3 |
| 3341 | PGBS | PSALMS FREIGHT LINE | | | SCAC4 |
| 3342 | PGBU | PERGAN GMBH | | | SCAC4 |
| 3343 | PGBX | Peoples Gas By-Products Corp. | 7/1930-1/1941 | | NAKINA |
| 3344 | PGBX | Peoples Gas By-Products Corp. | Apr-38 | | NRHS |
| 3345 | PGBX | PEOPLES GAS BY-PRODUCTS CORP. | | | PWRC |
| 3346 | PGC | Thai Cargo Airline Co., Ltd | Callsign: Thai Freighter, | T | AVCODES |
| 3347 | PGC | European Aircraft Private Club | Callsign: Green Club, | B | AVCODES |
| 3348 | PGCC | PITTSBURGH COACH CORP | | | SCAC3 |
| 3349 | PGCC | PILGRIMS REST FARM INC | | | SCAC4 |
| 3350 | PGCD | PROGISTIC CARRIERS LLC | | | SCAC4 |
| 3351 | PGCJ | PEGG, C J | | | SCAC3 |
| 3352 | PGCR | PRESTIGE CHARTER INC | | | SCAC3 |
| 3353 | PGCR | PRONTO GREAT CHINA CORP | | | SCAC4 |
| 3354 | PGCS | PAGEANT CO., S.A | | | SCAC3 |
| 3355 | PGCT | PGC LOGISITCS LLC | | | SCAC4 |
| 3356 | PGCU | GLOBAL CONTAINER TRADING GMBH | | | SCAC4 |
| 3357 | PGCX | Poly Grinders Corp. | added 7/1977; 1/1980; eliminated 7/1981 | | NAKINA |
| 3358 | PGCX | Peoples Gas Systems, Inc. | added 10/1985; 1/1994-7/2000; eliminated 4/2001; 7/2005 (not listed) | | NAKINA |
| 3359 | PGCX | General American Transportation Corp. | 7/1937 (not listed) | | NAKINA |
| 3360 | PGCX | Poly Grinders Corp. | added 7/77; 1/80; eliminated 7/81 | | NRHS |
| 3361 | PGCX | Peoples Gas Systems, Inc. | 1/94-7/2000; eliminated 4/2001 | | NRHS |
| 3362 | PGCX | *GENERAL AMERICAN TRANSPORTATION CORP. | | | PWRC |
| 3363 | PGCX | *POLY GRINDERS CORP. | | | PWRC |
| 3364 | PGCX | *PROCTOR & GAMBLE CELLULOSE | | | PWRC |
| 3365 | PGCX | +PEOPLES GAS SYSTEM, INC. | | | PWRC |
| 3366 | PGCX | Peoples Gas System | | | RSRV |
| 3367 | PGCX | HERITAGE OPERATING L P | | | SCAC4 |
| 3368 | PGDA | PKS Gdańsk | | PL | TRAFFIC |
| 3369 | PGDL | PRESTIGE DELIVERY SYSTEMS INC | | | SCAC3 |
| 3370 | PGDL | PRESTIGE DELIVERY SYSTEMS INC | | | SCAC4 |
| 3371 | PGDN | PRESTIGE GRANITE DESIGN INC | | | SCAC4 |
| 3372 | PGDR | PAGE, D R TRANSPORTATION INC | | | SCAC3 |
| 3373 | PGDS | PEGASUS DELIVERY SERVICE INC | | | SCAC3 |
| 3374 | PGDX | General Electric Rail Services Corp. | added 1/2000; 7/2000-7/2005 | | NAKINA |
| 3375 | PGDX | General Electric Railcar Services Corp. | added 1/1999; eliminated 1/2000 | | NAKINA |
| 3376 | PGDX | The Procter & Gamble Manufacturing Co. | added 1/1984; 1/1994; eliminated 1/1999 | | NAKINA |
| 3377 | PGDX | The Proctor & Gamble Manufacturing Co. | 1/94; eliminated 1/99 | | NRHS |
| 3378 | PGDX | General Electric Railcar Services Corp. | added 1/99; eliminated 1/2000 | | NRHS |
| 3379 | PGDX | General Electric Rail Services Corp. | added 1/2000; 7/2000 | | NRHS |
| 3380 | PGDX | GENERAL ELECTRIC RAIL SERVICES CORP.[PROCTER & GAMBLE MFG CO.] | | | PWRC |
| 3381 | PGDX | Procter and Gamble Manufacturing | | | RSRV |
| 3382 | PGDX | GENERAL ELECTRIC RAILCAR SERVICES C | | | SCAC4 |
| 3383 | PGE | Prestigeavia | Callsign: Presto, Ceased operations | UA | AVCODES |
| 3384 | PGE | Canadian National Railways | added 7/2005; 7/2005 | | NAKINA |
| 3385 | PGE | BC Rail Ltd. | added 10/1984; 1/1994-7/2000; eliminated 7/2005 | | NAKINA |
| 3386 | PGE | British Columbia Ry. Co. | 1/1975-1/1980; eliminated 10/1984 | | NAKINA |
| 3387 | PGE | Pacific Great Eastern Ry. Co. | 8/1920-10/1966 | | NAKINA |
| 3388 | PGE | Pacific Great Eastern Ry. Co. | 4/38-10/66 | | NRHS |
| 3389 | PGE | British Columbia Ry. Co. | 1/75-1/80; eliminated 10/84 | | NRHS |
| 3390 | PGE | BC Rail Ltd. | added 10/84; 1/94-7/2000 | | NRHS |
| 3391 | PGE | CANADIAN NATIONAL RAILWAY [BC RAIL LTD.; PACIFIC GREAT EASTERN RWY.] | | | PWRC |
| 3392 | PGE | Pacific Great Eastern Railway (Canadian National Railway) | | | RSRV |
| 3393 | PGE | Pacific Great Eastern Railway | | CDN | TRAFFIC |
| 3394 | PGEA | PARRY, RYAN INC | | | SCAC4 |
| 3395 | PGEC | PAGE STEEL CO | | | SCAC4 |
| 3396 | PGEE | PAGE, EILEEN | | | SCAC4 |
| 3397 | PGEF | PANGEA FOSSILS LTD | | | SCAC4 |
| 3398 | PGEI | PAGE INTERNATIONAL SA | | | SCAC3 |
| 3399 | PGEJ | PILLIKEN, GLENN E JR | | | SCAC3 |
| 3400 | PGEK | PAGE TRUCKING INC | | | SCAC4 |
