| 1 | RR | Royal Air Force | ICAO: RFR, Callsign: Rafair, Designator RR recalled by IATA. | GB | AVCODES |
| 2 | RR | Ryanair Sun S.A. | ICAO: RYS, Callsign: Magic Sun, Name changed to Ryanair Sun S.A. t/a BUZZ. Ryanair Holdings Group | PL | AVCODES |
| 3 | RR | Ryanair Sun S.A. t/a BUZZ | ICAO: RYS, Callsign: Magic Sun, Name changed from Ryanair Sun S.A. Ryanair Holdings Group | PL | AVCODES |
| 4 | RR | Consolidated Rail Corp. | added 10/1980; 1/1994; eliminated 7/1999 | | NAKINA |
| 5 | RR | Raritan River R.R. Co. | 7/1923-1/1980; eliminated 7/1980 | | NAKINA |
| 6 | RR | Raritan River R.R. Co. | 4/38-1/80; eliminated 7/80 | | NRHS |
| 7 | RR | Consolidated Rail Corp. | added 10/80; 1/94; eliminated 7/99 | | NRHS |
| 8 | RR | CONSOLIDATED RAIL CORP. [RARITAN RIVER RR] | | | PWRC |
| 9 | RR | Raritan River Railroad (Conrail) | | | RSRV |
| 10 | RR | Raritan River R.R. Co. | | USA | TRAFFIC |
| 11 | RR | Rautaruukki Oy | | FI | VKM |
| 12 | RRA | Royal Rwanda Airlines | Callsign: Royal Rwanda, | RWA | AVCODES |
| 13 | RRA | Royal Rwanda Airlines | | | ICAO1 |
| 14 | RRAA | R R TRUCKING LLC | | | SCAC4 |
| 15 | RRAC | ROCHA, R TRUCKING | | | SCAC4 |
| 16 | RRAE | R & R TRANSPORTATION | | | SCAC4 |
| 17 | RRAG | RUSSELL RIDGE TRANSPORT INC | | | SCAC4 |
| 18 | RRAH | RIO REBELS TRUCKING | | | SCAC4 |
| 19 | RRAJ | R & R TAKHAR TRANSPORTATION LTD | | | SCAC4 |
| 20 | RRAP | RAMIREZ RANCH | | | SCAC4 |
| 21 | RRAQ | R R & ASSOCIATES LLC | | | SCAC4 |
| 22 | RRAR | UMLER TEST ROAD NO.13 | | | PWRC |
| 23 | RRAR | RSR RACING LLC | | | SCAC4 |
| 24 | RRAV | R & R CLASSIC CARS | | | SCAC4 |
| 25 | RRAY | RICHARDSON, RAY TRUCKING | | | SCAC3 |
| 26 | RRB | Aero Club de Castellon | | E | AVCODES |
| 27 | RRB | RAMPART RANGE CORPORATION | | | PWRC |
| 28 | RRB | RRB Slovakia, s.r.o. | | SK | VKM |
| 29 | RRBA | ROJAS RUIZ, BALTAZAR | | | SCAC4 |
| 30 | RRBB | R & R BIG BUS | | | SCAC4 |
| 31 | RRBE | REEDEREI BLUE STAR GMBH | | | SCAC4 |
| 32 | RRBG | R & R BROKERAGE | | | SCAC3 |
| 33 | RRBH | ROSEAU RIVER BUFFALO RANCH | | | SCAC4 |
| 34 | RRBK | R & R BULK TRANSPORT INC | | | SCAC4 |
| 35 | RRBL | RED RIVER BARGE LINE, INC | | | SCAC3 |
| 36 | RRBN | RAPID ROBIN | | | SCAC3 |
| 37 | RRBS | ROADRUNNER BUS LINES | | | SCAC3 |
| 38 | RRBT | ROARK, ROBERT TRUCKING CO | | | SCAC3 |
| 39 | RRBT | ROARK, ROBERT TRUCKING CO | | | SCAC4 |
| 40 | RRBU | RRB RAILROAD GMBH | | D | BIC |
| 41 | RRBX | Rampart Range Corp. | added 4/1994; eliminated 7/1999; added 10/1999; 7/2000-7/2005; eliminated 1/2007 | | NAKINA |
| 42 | RRBX | Rampart Range Corp. | added 4/94; eliminated 7/99; added 10/99; 7/2000 | | NRHS |
| 43 | RRBX | RAMPART RANGE CORPORATION | | | PWRC |
| 44 | RRBX | Rampart Range Corporation | | | RSRV |
| 45 | RRBX | RAMPART RANGE CORPORATION | | | SCAC4 |
| 46 | RRC | Aero Roca, S.A. de C.V. | Callsign: Aeroroca, | MEX | AVCODES |
| 47 | RRC | Aero Roca | | | ICAO1 |
| 48 | RRC | REDMONT RAILWAY COMPANY | | | PWRC |
| 49 | RRC | Respondek Railroad Corporation | | | RSRV |
| 50 | RRC | REDMONT RAILWAY COMPANY INC | | | SCAC4 |
| 51 | RRC | Respondek Railroad Corporation | | USA | TRAFFIC |
| 52 | RRCB | RAWHIDE RODEO COMPANY | | | SCAC4 |
| 53 | RRCE | RACE RECYCLING AND COMPACTING EQUIP | | | SCAC4 |
| 54 | RRCF | ROUGH RIDER CRANE SERVICE | | | SCAC4 |
| 55 | RRCG | R AND R CARTAGE INC | | | SCAC3 |
| 56 | RRCH | R & R CHARTER | | | SCAC3 |
| 57 | RRCH | R & R OIL INC | | | SCAC4 |
| 58 | RRCI | Redmont Ry. Co., Inc. | 7/2000-7/2005 | | NAKINA |
| 59 | RRCI | Redmont Ry. Co., Inc. | Jul-00 | | NRHS |
| 60 | RRCI | REDMONT RAILWAY COMPANY | | | PWRC |
| 61 | RRCI | Redmont Railway | | | RSRV |
| 62 | RRCI | R & R CONTRACTING INC | | | SCAC4 |
| 63 | RRCK | RED ROCK ENTERPRISES LLC | | | SCAC4 |
| 64 | RRCL | R & R EXPEDITERS INC | | | SCAC3 |
| 65 | RRCM | RIVER REGION COOPERATIVE | | | SCAC4 |
| 66 | RRCN | R & R CONSTRUCTION CO INC | | | SCAC4 |
| 67 | RRCO | Rochelle R.R. Co. | 7/2000-7/2005 | | NAKINA |
| 68 | RRCO | Rochelle R.R. Co. | Jul-00 | | NRHS |
| 69 | RRCO | ROCHELLE RAILROAD COMPANY | | | PWRC |
| 70 | RRCO | Rochelle Railroad | | | RSRV |
| 71 | RRCO | ROCHELLE RAILROAD CO | | | SCAC4 |
| 72 | RRCP | REMI MARITIME CORPORATION | | | SCAC4 |
| 73 | RRCQ | RADAR RUNNERS CORP | | | SCAC4 |
| 74 | RRCS | RELIABLE RUNNERS COURIER SERVICE IN | | | SCAC4 |
| 75 | RRCT | RR CONSULTING | | | SCAC4 |
| 76 | RRCU | RAUTARUUKKI OY | | | SCAC3 |
| 77 | RRCU | REFTRADE RENTAL B V | | | SCAC4 |
| 78 | RRCV | RIVER CITY VAN LINE INC | | | SCAC3 |
| 79 | RRCX | Radar Railcar, Inc. | 1/1994-7/2005 (not listed) | | NAKINA |
| 80 | RRCX | Regent Refining (Canada) Ltd. (marks changed from TLCX) | added 4/1956; 10/1957; eliminated 10/1958 | | NAKINA |
| 81 | RRCX | Regent Refining (Canada) Ltd. | 10/57; eliminated 10/58 | | NRHS |
| 82 | RRCX | Radar Railcar, Inc. | 1/94-7/2000 | | NRHS |
| 83 | RRCX | *REGENT REFINING (CANADA) LTD. | | | PWRC |
| 84 | RRCX | +RADER RAILCAR, INC. | | | PWRC |
| 85 | RRCX | Radar Railcar | | | RSRV |
| 86 | RRCX | RADAR RAILCAR, INC. | | | SCAC4 |
| 87 | RRCY | RAPID RECOVERY TOWING LTD | | | SCAC4 |
| 88 | RRD | ADOLPH COORS COMPANY | | | PWRC |
| 89 | RRDC | RAILINC | | | SCAC3 |
| 90 | RRDC | RAILINC | | | SCAC4 |
| 91 | RRDD | R & R DISTRIBUTORS INC | | | SCAC4 |
| 92 | RRDE | ROADRUNNER DELIVERY SERVICE | | | SCAC3 |
| 93 | RRDF | REED, R D HEAVY TRANSPORT LLC | | | SCAC4 |
| 94 | RRDI | ROAD RUNNER DELIVERY INC | | | SCAC3 |
| 95 | RRDL | ROAD RUNNER DELIVERY SERVICE INC | | | SCAC3 |
| 96 | RRDM | RICHCO ROTTERDAM B V | | | SCAC3 |
| 97 | RRDN | R & R DISTRIBUTING CO INC | | | SCAC4 |
| 98 | RRDP | ROMAN ROAD EXPRESS | | | SCAC4 |
| 99 | RRDR | ROUGHRIDER TRANSPORT | | | SCAC3 |
| 100 | RRDS | RAPID RESPONSE DELIVERY INC | | | SCAC4 |
