| 1 | IWS | Aviainvest, Joint Stock Company | | RUS | AVCODES |
| 2 | IWS | Aviainvest | | | ICAO1 |
| 3 | IWSC | INTERNATIONAL WAREHOUSE SERVICES IN | | | SCAC4 |
| 4 | IWSI | INDUSTRIAL WAREHOUSE SERVICES INC | | | SCAC4 |
| 5 | IWSL | ID WALLEM SHIPMANAGEMENT LTD | | | SCAC4 |
| 6 | IWSN | INDUSTRIAL WASTE SERVICE INC | | | SCAC4 |
| 7 | IWSQ | IONIAN WAVE SHIPPING INC | | | SCAC4 |
| 8 | IWSU | WISCONSIN & SOUTHERN RAILROAD CO | | | SCAC3 |
| 9 | IWSU | WISCONSIN & SOUTHERN RAILROAD | | | SCAC4 |
| 10 | IWSX | Illinois-Wisconsin Sand & Gravel Co. | added 7/1972; 1/1975-1/1980; eliminated 10/1980 | | NAKINA |
| 11 | IWSX | Illinois-Wisconsin Sand & Gravel Co. | 1/75-1/80; eliminated 10/80 | | NRHS |
| 12 | IWSX | ILLINOIS-WISCONSIN SAND & GRAVEL CO | | | PWRC |
| 13 | IWSX | ILLINOIS-WISCONSIN SAND & GRAVEL CO | | | SCAC4 |
| 14 | IWSY | INTERWEST SYSTEMS INC | | | SCAC4 |
