| 1 | SDT | Terrain Sdp, S.A. | Callsign: Terrain, | E | AVCODES |
| 2 | SDT | San Diego Transit | | US-CA | TRAFFIC |
| 3 | SDTB | S D T | | | SCAC4 |
| 4 | SDTC | STAR DIAMOND TOOLS INC | | | SCAC4 |
| 5 | SDTG | SHERIDAN BROKERAGE LLC | | | SCAC4 |
| 6 | SDTI | SAN DIEGO TROLLEY, INC. | | | PWRC |
| 7 | SDTL | SODREL TRUCK LINES INC | | | SCAC4 |
| 8 | SDTM | SUDDATH RELOCATION SYSTEMS OF MELBO | | | SCAC4 |
| 9 | SDTQ | SEND TRUCKING COMPANY | | | SCAC4 |
| 10 | SDTR | SERVICIOS DE TRANSPORTES RAPIDOS S | | | SCAC4 |
| 11 | SDTS | SCHNEIDER NATIONAL CARRIERS INC (DE | | | SCAC4 |
| 12 | SDTT | S & D TRUCKING GROUP INC | | | SCAC4 |
| 13 | SDTV | SHER-DEL TRANSFER & RELOCATION SERV | | | SCAC4 |
| 14 | SDTZ | (GTW) RETIRED 10-19-93 ATP | | | PWRC |
