| 1 | TDB | Welch Aviation, Inc. | Callsign: Thunder Bay, | USA | AVCODES |
| 2 | TDB | Welch Aviation | | | ICAO1 |
| 3 | TDBB | TRANSPORTES DEL TORO | | | SCAC4 |
| 4 | TDBC | TINGLE DISTRIBUTING CO INC | | | SCAC3 |
| 5 | TDBG | TRIPLE D BROKERAGE INC (BROKERAGE D | | | SCAC4 |
| 6 | TDBI | T D AND M TRANSPORT INC | | | SCAC4 |
| 7 | TDBJ | THRIFT DELIVERY SERVICE | | | SCAC4 |
| 8 | TDBK | TDS BROKERAGE SERVICES | | | SCAC3 |
| 9 | TDBK | TRITURADOS Y BLOCK SA DE CV | | | SCAC4 |
| 10 | TDBL | THUNDERBOLT TRANSPORTATION INC | | | SCAC3 |
| 11 | TDBM | TRI DELTA BUILDING MATERIALS CO INC | | | SCAC3 |
| 12 | TDBN | TRITON DISTRIBUTION SERVICES INC | | | SCAC3 |
| 13 | TDBO | TRANSPORT DBML | | | SCAC4 |
| 14 | TDBP | THUNDERBIRD PACIFIC,INC | | | SCAC3 |
| 15 | TDBQ | TDS AUTOMOTIVE CANADA INC | | | SCAC4 |
| 16 | TDBR | THUNDERBIRD TRANSPORTATION LTD | | | SCAC3 |
| 17 | TDBR | TRANSPORTES DON BETO | | | SCAC4 |
| 18 | TDBS | TANDEM DISTRIBUTION SERVICES INC | | | SCAC3 |
| 19 | TDBT | TAYLOR, DARRYL B TRANSPORTATION INC | | | SCAC3 |
| 20 | TDBT | TRANSPORT DANY BOULANGER INC | | | SCAC4 |
| 21 | TDBV | T & D BUS SERVICE | | | SCAC3 |
| 22 | TDBV | TRANSPORT DANIEL PERREAULT INC | | | SCAC4 |
