| 1 | IAT | International Air Transport Association | IATA: XB, Non-airline org. relating to the airline industry | CDN | AVCODES |
| 2 | IAT | International Air Transport Association | IATA: XB, Billing and Settlement Plan. Non-airline org. relating to the airline industry | CDN | AVCODES |
| 3 | IAT | International Air Transport Association | IATA: XB, Billing and Settlement Plan. Non-airline org. relating to the airline industry | CDN | AVCODES |
| 4 | IAT | Iowa Traction R.R. Co. | added 7/1987; eliminated 1/1988 | | NAKINA |
| 5 | IAT | Iowa Terminal R.R. Co. | 1/1975-1/1980; added 10/1980; eliminated 7/1987 | | NAKINA |
| 6 | IAT | Iowa Terminal R.R. Co. | 1/75-1/80; added 10/80; eliminated 7/87 | | NRHS |
| 7 | IAT | Iowa Traction R.R. Co. | added 7/87; eliminated 1/88 | | NRHS |
| 8 | IAT | IOWA TRACTION RAILROAD CO.[IOWA TERMINAL RAILROAD CO.] | | | PWRC |
| 9 | IAT | Iowa Terminal Railroad | | | RSRV |
| 10 | IATC | I A TRUCKING LLC | | | SCAC4 |
| 11 | IATI | INNOVATIVE APPLIED TECHNOLOGIES INC | | | SCAC4 |
| 12 | IATL | IAT LOGISTICS | | | SCAC4 |
| 13 | IATO | I A TRANSPORT | | | SCAC4 |
| 14 | IATP | INTERLINK AUTO TRANSPORT LLC | | | SCAC4 |
| 15 | IATR | Iowa Traction R.R. Co. | added 7/1987; 1/1994-7/2005 | | NAKINA |
| 16 | IATR | Iowa Traction R.R. Co. | added 7/87; 1/94-7/2000 | | NRHS |
| 17 | IATR | IOWA TRACTION RAILROAD CO. | | | PWRC |
| 18 | IATR | Iowa Traction Railroad | | | RSRV |
| 19 | IATR | IOWA TRACTION RAILROAD COMPANY | | | SCAC4 |
| 20 | IATU | INTERAGNET S.R.L. | | | SCAC4 |
