| 1 | PRB | Proteus Airlines | IATA: YS, Callsign: Proteus, IATA Prefix: 977, Name changed to Regional Compagnie Aerienne Europeene on 30 March 2001. | F | AVCODES |
| 2 | PRB | Regional Compagnie Aerienne Europeene | IATA: YS, Callsign: Proteus, IATA Prefix: 977, Formed from merger of Proteus Airlines, Flandre Air, and Regional Airlines. | F | AVCODES |
| 3 | PRB | Puerto Rico Air Management Services, Inc | Callsign: Prams Air, | PRI | AVCODES |
| 4 | PRB | Peusse Baubetriebe GmbH | | DE | VKM |
| 5 | PRBA | PRO-ABRASIV | | | SCAC4 |
| 6 | PRBC | PERNO BUS CO INC | | | SCAC3 |
| 7 | PRBD | PARKERSBURG DELIVERY SERVICE | | | SCAC3 |
| 8 | PRBD | PRO BEL ENTERPRISES LTD | | | SCAC4 |
| 9 | PRBE | P R B ENTERPRISES INC | | | SCAC3 |
| 10 | PRBE | PARISIEN, ROBERT ERNEST OR JOAN ELI | | | SCAC4 |
| 11 | PRBG | PHOENIX REEDEREI BEREEDERUNGS GMBH | | | SCAC4 |
| 12 | PRBI | PRINCE BROS INC | | | SCAC3 |
| 13 | PRBL | PIONEER BUS LINES | | | SCAC3 |
| 14 | PRBM | PROFREIGHT CONTAINER LINES | | | SCAC4 |
| 15 | PRBN | PREMIUM BEST TRANSPORT | | | SCAC4 |
| 16 | PRBO | PARKE BROS TRUCKING INC | | | SCAC3 |
| 17 | PRBR | PRISCO MOVING AND STORAGE INC | | | SCAC3 |
| 18 | PRBT | PENSKE RACING INC | | | SCAC4 |
| 19 | PRBT | PREBET AIUD SA | | RO | VKM |
| 20 | PRBU | PRS PASSIVE REFRIGERATION SOLUTIONS S.A. | | CH | BIC |
| 21 | PRBV | PRICE BROTHERS TRANSPORTATION SERVI | | | SCAC3 |
| 22 | PRBX | Trinity Rail Management, Inc. | added 7/1997; 7/2000-7/2005 | | NAKINA |
| 23 | PRBX | Transcisco Leasing Co. | added 7/1994; eliminated 7/1997 | | NAKINA |
| 24 | PRBX | Producers & Refiners Corp. | 8/1920 | | NAKINA |
| 25 | PRBX | Transcisco Leasing Co. | added 7/94; eliminated 7/97 | | NRHS |
| 26 | PRBX | Trinity Rail Management, Inc. | added 7/97; 7/2000 | | NRHS |
| 27 | PRBX | *PRODUCERS & REFINERS CORP. | | | PWRC |
| 28 | PRBX | +TRINITY RAIL MANAGEMENT INCORPORATED [(MCHX) TRANSCISCO LEASING CO.] | | | PWRC |
| 29 | PRBX | Trinity Rail Management | | | RSRV |
| 30 | PRBX | TRINITY RAIL MANAGEMENT | | | SCAC4 |
