| 7101 | RONJ | ROGERS TRANSFER, INC | | | SCAC3 |
| 7102 | RONK | RONNIES TRUCKING INC | | | SCAC4 |
| 7103 | RONL | ROTRANSCO | | | SCAC3 |
| 7104 | RONM | RONNOCO 1 INC | | | SCAC4 |
| 7105 | RONN | RONE TRUCKING INC | | | SCAC3 |
| 7106 | RONN | RONE TRUCKING INC | | | SCAC4 |
| 7107 | RONO | RONS TOWING | | | SCAC3 |
| 7108 | RONP | RONS PRODUCE INC | | | SCAC3 |
| 7109 | RONP | ROLL ON TRANSPORTATION INC | | | SCAC4 |
| 7110 | RONQ | RONEY DELIVERY SERVICE | | | SCAC3 |
| 7111 | RONR | RONS TRANSPORT | | | SCAC3 |
| 7112 | RONS | ROBERTS & SINGER | | | SCAC3 |
| 7113 | RONS | ROBERTS & SINGER | | | SCAC4 |
| 7114 | RONT | RONALDS TRAILER TRANSPORT | | | SCAC3 |
| 7115 | RONU | RDON, INC. | | | SCAC3 |
| 7116 | RONU | NAHSHOL TALLYING AND SUPERVISION | | | SCAC4 |
| 7117 | RONW | ROWELL & WATSON CO INC | | | SCAC3 |
| 7118 | RONX | MACQUARIE RAIL INC | | | SCAC4 |
| 7119 | ROO | Aeroitalia | Callsign: Aeroitalia, | I | AVCODES |
| 7120 | ROO | Aero Roa, S.A. de C.V. | Callsign: Aero Ria, | MEX | AVCODES |
| 7121 | ROO | Aeroitalia | | | ICAO1 |
| 7122 | ROOC | ROCO OIL COMPANY INC | | | SCAC3 |
| 7123 | ROOC | ROCO OIL COMPANY INC | | | SCAC4 |
| 7124 | ROOG | ROCCO-S TRUCKING INC | | | SCAC4 |
| 7125 | ROOH | ROSE TRANSPORT INC | | | SCAC3 |
| 7126 | ROOH | ROSE TRANSPORT INC | | | SCAC4 |
| 7127 | ROOL | ROGER, R T OIL CO INC | | | SCAC4 |
| 7128 | ROOM | ROLL ON TRANSPORTATION COMPANY | | | SCAC4 |
| 7129 | ROON | ROOSEN TRUCKING | | | SCAC4 |
| 7130 | ROOR | ROORDA TRANSPORT CO | | | SCAC3 |
| 7131 | ROOS | ROOSTER EXPRESS INC | | | SCAC3 |
| 7132 | ROOS | ROOSTER CRUISER LLC | | | SCAC4 |
| 7133 | ROOV | ROBERTSONS OVERLAND EXPRESS | | | SCAC3 |
| 7134 | ROP | Royal Oman Police | | OM | AVCODES |
| 7135 | ROP | Royal Oman Police | | | ICAO1 |
| 7136 | ROP | RAIL OPERATIONS SRL | | RO | VKM |
| 7137 | ROPA | RONSON TRANSPORTATION INC | | | SCAC3 |
| 7138 | ROPAG | ROP Roth AG | | DE | VKM |
| 7139 | ROPAN | EUROPAN PROD SA | | RO | VKM |
| 7140 | ROPC | ROGERS PETRO-CHEM CO | | | SCAC3 |
| 7141 | ROPE | ROMERO, PAT FEEDS AND SUPPLY | | | SCAC3 |
| 7142 | ROPE | ROTATION POWER & EQUIPMENT | | | SCAC4 |
| 7143 | ROPG | ROYAL PROCESSING CO INC | | | SCAC3 |
| 7144 | ROPN | ROSE TRANSPORTATION INC | | | SCAC3 |
| 7145 | ROPR | ROSE TRANSPORTATION INC | | | SCAC3 |
| 7146 | ROPS | ROCAROL PARCEL SYSTEM | | | SCAC3 |
| 7147 | ROPT | ROPPE TRANSPORTATION CORPORATION | | | SCAC3 |
| 7148 | ROPX | Rail Operators, Inc. | added 7/1993; 1/1994; eliminated 4/1997; 7/2000 (not listed) | | NAKINA |
| 7149 | ROPX | Rail Operators, Inc. | added 7/93; 1/94; eliminated 4/97; 7/2000 | | NRHS |
| 7150 | ROPX | RAIL OPERATORS, INC. | | | PWRC |
| 7151 | ROPX | Rail Operators | | | RSRV |
| 7152 | ROQS | ROSES TRANSPORT INC | | | SCAC4 |
| 7153 | ROQT | ROSS, R L EQUIPMENT | | | SCAC3 |
| 7154 | ROR | Roraima Airways | Callsign: Roraima, | GUY | AVCODES |
| 7155 | ROR | Roraima Airways | | | ICAO1 |
| 7156 | ROR | Rockton & Rion Ry. | 1/1975-1/1980 | | NAKINA |
| 7157 | ROR | Rockton & Rion Ry. | 1/75-1/80 | | NRHS |
| 7158 | ROR | FORMERLY ROCKTON & RION RAILROAD | | | PWRC |
| 7159 | ROR | ROCKTON & RION RAILWAY | | | SCAC4 |
| 7160 | RORA | ROGER A LEASING LTD (DIV OF AIPA) | | | SCAC3 |
| 7161 | RORB | ROMERO ORTEGA, RUBEN | | | SCAC4 |
| 7162 | RORF | ROARING FORK FOUNDERS | | | SCAC3 |
| 7163 | RORF | ROMERO ROBLES, FAUSTO | | | SCAC4 |
| 7164 | RORG | ROANES RIGGING & TRANSFER CO INC | | | SCAC3 |
| 7165 | RORI | ROTRA INC | | | SCAC3 |
| 7166 | RORI | ROTRA LLC | | | SCAC4 |
| 7167 | RORL | ROMAN, R TRUCK LEASING INC | | | SCAC3 |
| 7168 | RORL | ROMAN, R TRUCK LEASING INC | | | SCAC4 |
| 7169 | RORM | ROADRUNNER MOTOR LINES INC | | | SCAC3 |
| 7170 | RORN | ROADRUNNER EXPRESS SERVICE | | | SCAC3 |
| 7171 | RORO | RODCO TRANSPORTATION | | | SCAC3 |
| 7172 | RORP | ROAD RUNNER EXPRESS | | | SCAC3 |
| 7173 | RORR | ROPER TRUCKING SERVICE | | | SCAC3 |
| 7174 | RORT | ROAD RAIL TRANSPORT LTD | | | SCAC3 |
| 7175 | RORT | RO TRANSPORT | | | SCAC4 |
| 7176 | RORU | Road Runner | Fleetname for some S.M.Coaches operations | GB | TRAFFIC |
| 7177 | RORX | Radio Oil Refineries, Ltd. | 7/1937 (not listed); 4/1938-1/1952; eliminated 4/1953 | | NAKINA |
| 7178 | RORX | Radio Oil Refineries, Ltd. | 4/38-1/52 | | NRHS |
| 7179 | RORX | *RADIO OIL REFINERIES, LTD. | | | PWRC |
| 7180 | RORX | +RED OAK RAIL TRANSPORT, LLC | | | PWRC |
| 7181 | RORY | ROUTH, RAY & SONS INC | | | SCAC3 |
| 7182 | RORZ | ROBINSON RUN | | | PWRC |
| 7183 | ROS | Rossair Europe B.V. | Callsign: Catcher, | NL | AVCODES |
| 7184 | ROS | ATS-Aviation Transport Services (ATS-Servicii de Transport Aerian) | Callsign: Romas, | RO | AVCODES |
| 7185 | ROS | F.A.S. Rhodos Pilots Academy | Callsign: Lindos Air, | GR | AVCODES |
| 7186 | ROS | Rossair Europe | | | ICAO1 |
| 7187 | ROSA | RENOWN CO SA, PANAMA REP OF PANAMA | | | SCAC3 |
| 7188 | ROSA | ROSALYN TANKER CORPORATION | | | SCAC4 |
| 7189 | ROSB | ROSENBAUM CARREON, RENE | | | SCAC4 |
| 7190 | ROSC | RODINO SHIPPING COMPANY LIMITED | | | SCAC4 |
| 7191 | ROSD | ROSS TRANSPORT CO INC | | | SCAC3 |
| 7192 | ROSE | ROSENBERGER ENTERPRISES INC | | | SCAC3 |
| 7193 | ROSE | ROSE INTERNATIONAL INC | | | SCAC4 |
| 7194 | ROSG | ROAD SERVICE GARAGE | | | SCAC3 |
| 7195 | ROSI | ROSEVILLE MOTOR EXPRESS, INC | | | SCAC3 |
| 7196 | ROSI | ROSEVILLE MOTOR EXPRESS INC | | | SCAC4 |
| 7197 | ROSL | ROSEVELT, JAMES L | | | SCAC3 |
| 7198 | ROSL | ROSE LOGISTICS INC | | | SCAC4 |
| 7199 | ROSM | ROSE, WILLIAM GARY | | | SCAC3 |
| 7200 | ROSM | RESORTES K-L DE MEXICO SA DE CV | | | SCAC4 |
