| 1 | IDT | Illinois Department of Transportation | Callsign: Idot, | USA | AVCODES |
| 2 | IDTG | INDUSTRIAL TRUCKING GROUP INC | | | SCAC4 |
| 3 | IDTI | IDEAL DRAIN TILE LIMITED | | | SCAC4 |
| 4 | IDTO | INDUSTRIAL CONNECTIONS INC | | | SCAC4 |
| 5 | IDTR | IDA-TRAN FREIGHT SYSTEMS, INC | | | SCAC1 |
| 6 | IDTS | INDUSTRIAL TRANSPORT SERVICES LLC | | | SCAC4 |
| 7 | IDTU | ODYSSEY FOODTRANS | | USA | BIC |
| 8 | IDTU | Hawaii Intermodal Tank Transport | | | RSRV |
| 9 | IDTU | HAWAII INTERMODAL TANK TRANSPORT LL | | | SCAC4 |
| 10 | IDTV | INDUSTRIAL TRANSPORT INC | | | SCAC4 |
| 11 | IDTX | INDIANA DINNER TRAIN | | | PWRC |
