| 1 | RIS | Air Services Ltd. | Callsign: Airis, | CZ | AVCODES |
| 2 | RIS | Aeris Gestion S.L. | Callsign: Aeris, | E | AVCODES |
| 3 | RIS | Aeris Gestion | | | ICAO1 |
| 4 | RIS | Rock Island Southern Ry. (Co.) | 7/1923-7/1954 | | NAKINA |
| 5 | RIS | Rock Island Southern Ry. | 4/38-1/52 | | NRHS |
| 6 | RIS | Regio-Infra-Service Sachsen GmbH | Chemnitz | D | privat-bahn.de |
| 7 | RIS | ROCK ISLAND SOUTHERN RWY. CO. | | | PWRC |
| 8 | RIS | Regio Infra Service | | D | TRAFFIC |
| 9 | RIS | Regio Infra Service Sachsen GmbH | | DE | VKM |
| 10 | RISB | RISBERGS TRUCK LINE | | | SCAC3 |
| 11 | RISB | ROBINSON I SHIPPING CORPORATION LIB | | | SCAC4 |
| 12 | RISC | RIVERSIDE SERVICE CORPORATION | | | SCAC3 |
| 13 | RISE | REUSE IT STORE | | | SCAC4 |
| 14 | RISF | RIST TRANSPORT LTD | | | SCAC3 |
| 15 | RISF | RIST TRANSPORT LTD | | | SCAC4 |
| 16 | RISH | RISH-POLL INC | | | SCAC3 |
| 17 | RISI | RISS TRANSPORTATION COMPANY | | | SCAC3 |
| 18 | RISI | RISINGER BROS TRANSFER INC (DEDICAT | | | SCAC4 |
| 19 | RISL | RHODE ISLAND TOWING | | | SCAC3 |
| 20 | RISM | R I S EXPRESS | | | SCAC3 |
| 21 | RISM | RISTOW TRUCKING INC (TRUCKLOAD DIVI | | | SCAC4 |
| 22 | RISN | RISINGER BROS TRANSFER INC | | | SCAC3 |
| 23 | RISN | RISINGER BROS TRANSFER INC | | | SCAC4 |
| 24 | RISO | RILEY & SON TRUCKING | | | SCAC3 |
| 25 | RISQ | RIISER TRANSPORT INC | | | SCAC3 |
| 26 | RISR | RISCHITELLI BROTHERS INC | | | SCAC3 |
| 27 | RISS | RISS AND CO INC | | | PWRC |
| 28 | RISS | | | D | TRAFFIC |
| 29 | RIST | RISTOW TRUCKING INC | | | SCAC4 |
| 30 | RISV | RAIMAR SERVICES INC | | | SCAC3 |
| 31 | RISV | RELIABLE INTERMODAL SERVICES LLC | | | SCAC4 |
| 32 | RISW | RIVERSIDE WASTE PAPER CORP | | | SCAC3 |
| 33 | RISX | Republic Steel Corp. | 7/1932 | | NAKINA |
| 34 | RISX | Republic Iron & Steel Co. | 7/1930 | | NAKINA |
| 35 | RISX | REPUBLIC STEEL CORP. [REPUBLIC IRON & STEEL CO.] | | | PWRC |
| 36 | RISZ | RILEY SPUR | | | PWRC |
| 37 | RISZ | JDSB REFRIGERATED INTERMODAL SERVIC | | | SCAC4 |
