| 101 | RFGD | REFRIGERATED TRUCKING SERVICE, INC | | | SCAC3 |
| 102 | RFGD | REFRIGERATED TRUCKING SERVICE INC | | | SCAC4 |
| 103 | RFGH | RAIL FREIGHT TRANS CO | | | SCAC3 |
| 104 | RFGH | RAIL FREIGHT TRANSPORTATION INC | | | SCAC4 |
| 105 | RFGI | ROYAL FREIGHT INC | | | SCAC3 |
| 106 | RFGI | RAFAGAS DEL PACIFICO | | | SCAC4 |
| 107 | RFGM | REFRIGERADOS SDL | | | SCAC4 |
| 108 | RFGP | R F G | | | SCAC4 |
| 109 | RFGT | R F G TRUCKING CO | | | SCAC3 |
| 110 | RFGT | R F G TRANSPORT INC | | | SCAC4 |
| 111 | RFH | Yunnan Ruifeng General Aviation Co., Ltd. | Callsign: Nut, | PRC | AVCODES |
| 112 | RFHS | REINDEER FREIGHT SYSTEM | | | SCAC3 |
| 113 | RFHS | REFRIGERADOS HERMANOS VELASCO ALCAR | | | SCAC4 |
| 114 | RFI | National Air Traffic Services Ltd | Callsign: Sherlock, | GB | AVCODES |
| 115 | RFI | National Air Traffic Services | | | ICAO1 |
| 116 | RFI | Rete Ferroviaria Italiana | The owner of the FS railway network. | I | TRAFFIC |
| 117 | RFI | Rete Ferroviaria Italiana | | IT | VKM |
| 118 | RFII | RAJ FREIGHTLINES INC | | | SCAC4 |
| 119 | RFIP | RAFFIELD FISHERIES INC | | | SCAC4 |
| 120 | RFIQ | RITTER FEEDS INC | | | SCAC4 |
| 121 | RFIS | RELIABLE FREIGHT SYSTEMS, INC | | | SCAC3 |
| 122 | RFIS | RELIABLE FREIGHT SYSTEMS INC | | | SCAC4 |
| 123 | RFIU | KUNMING RAILASIA FREIGHT INTERCONTINENTAL CO., LTD. | | PRC | BIC |
| 124 | RFJ | Royal Falcon of Jordan | IATA: RZ, IATA Prefix: 372, IATA designator changed to RL | JOR | AVCODES |
| 125 | RFJ | Royal Falcon of Jordan | IATA: RL, IATA Prefix: 372, IATA designator changed from RZ | JOR | AVCODES |
| 126 | RFJZ | (REAZ) RETIRED 06-17-91 ATP (2465) | | | PWRC |
| 127 | RFKB | RFK TRANSPORTATION BROKERAGE | | | SCAC4 |
| 128 | RFKC | RUTHERFORD TRUCKING COMPANY INC | | | SCAC3 |
| 129 | RFKT | R F K TRANSPORTATION SERVICES INC | | | SCAC3 |
| 130 | RFL | Interfly | Callsign: Infly, | I | AVCODES |
| 131 | RFL | Interfly | | | ICAO1 |
| 132 | RFLB | ROBINSON, C H WORLDWIDE (FLATBED DI | | | SCAC4 |
| 133 | RFLC | RELIABLE FREIGHT LINES INC | | | SCAC3 |
| 134 | RFLC | REPUBLIC FREIGHT LLC | | | SCAC4 |
| 135 | RFLD | ROYAL FOODS LTD | | | SCAC4 |
| 136 | RFLE | ROBERTO FLORES | | | SCAC4 |
| 137 | RFLE | Railflex | | D | TRAFFIC |
| 138 | RFLG | RED FISH LOGISTICS INC | | | SCAC4 |
| 139 | RFLH | RICHMOND FREIGHT LLC | | | SCAC4 |
| 140 | RFLI | ROSE FREIGHT LINES INC | | | SCAC3 |
| 141 | RFLI | RYAN INC | | | SCAC4 |
| 142 | RFLJ | ROYAL FENCE LIMITED | | | SCAC4 |
| 143 | RFLL | RED FUNNEL LINE LTD. | | | SCAC3 |
| 144 | RFLL | RIO FUEL & SUPPLY | | | SCAC4 |
| 145 | RFLM | RANDALL FARMS LLC | | | SCAC4 |
| 146 | RFLN | REBEL FREIGHT LINES INC | | | SCAC3 |
| 147 | RFLN | RIGAL FUELS LLC | | | SCAC4 |
| 148 | RFLO | RANCHO DE LAS FLORES | | | SCAC4 |
| 149 | RFLP | ROYAL FREIGHT L P | | | SCAC4 |
| 150 | RFLQ | R F LOGISTICS LLC | | | SCAC4 |
| 151 | RFLS | ROBINSON FREIGHT LINES | | | SCAC3 |
| 152 | RFLS | RAPID FLORAL SYSTEMS (RFS) INC | | | SCAC4 |
| 153 | RFLU | INTERMODAL TANK TRANSPORT INC. | | USA | BIC |
| 154 | RFLU | REFRIGERATED FREIGHT LINES LTD | | | SCAC3 |
| 155 | RFLU | R M I T | | | SCAC4 |
| 156 | RFLV | ROMEROS FARM LLC | | | SCAC4 |
| 157 | RFLY | REPUBLIC FREIGHT LLC | | | SCAC4 |
| 158 | RFMC | R F & MC TRUCK TRANSFER CO INC | | | SCAC4 |
| 159 | RFMG | ROCKFARM LOGISTICS LLC | | | SCAC4 |
| 160 | RFMI | RANKIN FARMS INC | | | SCAC4 |
| 161 | RFMK | RIFICI, MIGUEL TRUCK-N | | | SCAC4 |
| 162 | RFMM | RYAN FLEET MANAGEMENT | | | SCAC4 |
| 163 | RFMN | REFACCIONES Y MAQUINARIA DEL NOROES | | | SCAC4 |
| 164 | RFMO | R & F MOTORS INC | | | SCAC4 |
| 165 | RFMS | READS MOV | | | SCAC4 |
| 166 | RFMV | ROCKY FORD MOVING VANS INC | | | SCAC3 |
| 167 | RFMX | Caldwell-Baker Co. | added 7/1985; eliminated 10/1990; 1/1994-7/2005 (not listed) | | NAKINA |
| 168 | RFMX | Robert F. Miller | added 1/1974; 1/1975-1/1980; eliminated 7/1985 | | NAKINA |
| 169 | RFMX | Robert F. Miller | added 1/74; 1/75-1/80 | | NRHS |
| 170 | RFMX | Caldwell-Baker Co. | eliminated 10/90; 1/94-7/2000 | | NRHS |
| 171 | RFMX | CALDWELL-BAKER COMPANY {ROBERT F. MILLER] | | | PWRC |
| 172 | RFMX | Robert F. Miller (Coldwell-Baker) | | | RSRV |
| 173 | RFMX | CALDWELL-BAKER COMPANY | | | SCAC4 |
| 174 | RFNI | REACH FOURTY NINE (49) INC | | | SCAC3 |
| 175 | RFNR | REFINERS TRANSPORT, INC | | | SCAC3 |
| 176 | RFO | Air Foyal | | F | AVCODES |
| 177 | RFO | RAIL FORCE | | RO | VKM |
| 178 | RFOC | RED FLAME OIL CO | | | SCAC4 |
| 179 | RFOFS | Rail Force One Fleet Services | | NL | TRAFFIC |
| 180 | RFOH | ROSE FUEL OIL & HEATING COMPANY INC | | | SCAC4 |
| 181 | RFOJ | REIGEL FUEL OIL LLC | | | SCAC4 |
| 182 | RFOL | RAUSCH FUEL OIL COMPANY | | | SCAC4 |
| 183 | RFOM | REIF OIL TRANSPORT | | | SCAC4 |
| 184 | RFOP | ROBERTSON FUEL OIL INC | | | SCAC4 |
| 185 | RFOR | RANSFORD, KEN HOLDINGS LTD | | | SCAC4 |
| 186 | RFOT | RAPID FREIGHT OF TEXAS INC | | | SCAC3 |
| 187 | RFOW | REMCO FORWARDING LTD | | | SCAC4 |
| 188 | RFOY | REIT FUEL OIL COMPANY | | | SCAC4 |
| 189 | RFP | CSX Transportation, Inc. | 1/1994-7/2005 | | NAKINA |
| 190 | RFP | Richmond, Fredricksburg & Potomac Ry. Co. | added 1/1992; eliminated 7/1992 | | NAKINA |
| 191 | RFP | Richmond, Fredricksburg & Potomac R.R. Co. | 4/1938-1/1980; eliminated 1/1992 | | NAKINA |
| 192 | RFP | Richmond, Fredricksburg & Potomac R.R. Co. | 4/38-1/80; eliminated 1/92 | | NRHS |
| 193 | RFP | Richmond, Fredricksburg & Potomac Ry. Co. | added 1/92; eliminated 7/92 | | NRHS |
| 194 | RFP | CSX Transportation, Inc. | 1/94-7/2000 | | NRHS |
| 195 | RFP | CSX TRANSPORTATION, INC. [RICHMOND, FREDERICKSBURG & POTOMAC RR] | | | PWRC |
| 196 | RFP | Richmond, Fredericksburg and Potomac Railroad (CSX Transportation) | | | RSRV |
| 197 | RFP | Richmond, Fredricksburg & Potomac Railroad | | USA | TRAFFIC |
| 198 | RFPF | ROCKY FORD PET FOOD INC | | | SCAC3 |
| 199 | RFPM | REFINED PETROLEUM CO | | | SCAC3 |
| 200 | RFPO | ROSEBURG FOREST PRODUCTS CO | | | SCAC4 |
