| 1 | TCY | Twin Cities Air Service, Inc. | Callsign: Twin City, | USA | AVCODES |
| 2 | TCY | Travel City Direct | | GB | AVCODES |
| 3 | TCY | Twin Cities Air Service | | | ICAO1 |
| 4 | TCYA | TRI-COUNTY TRANSPORT INC | | | SCAC4 |
| 5 | TCYB | TRI COUNTY BUS INC | | | SCAC3 |
| 6 | TCYC | TWIN CITY CONSTRUCTION | | | SCAC3 |
| 7 | TCYD | TRI-COUNTY DELIVERY SERVICE | | | SCAC3 |
| 8 | TCYE | TRI-COUNTY EXPRESS INC | | | SCAC3 |
| 9 | TCYG | TRANS COUNTRY MOVING AND STORAGE | | | SCAC3 |
| 10 | TCYH | TRI-STATE RECYCLING SERVICES INC | | | SCAC4 |
| 11 | TCYI | TRANS COUNTY INC | | | SCAC3 |
| 12 | TCYI | T & C WHOLESALE INC | | | SCAC4 |
| 13 | TCYJ | TRI-CITY TRANSPORT LLC | | | SCAC4 |
| 14 | TCYK | TRI COUNTY GASMAN INC | | | SCAC4 |
| 15 | TCYL | TRI-CITY OIL CO INC | | | SCAC4 |
| 16 | TCYM | TRI-CITY MOVING & STORAGE | | | SCAC3 |
| 17 | TCYM | TRANSPORTACION Y MANIOBRAS S R L DE | | | SCAC4 |
| 18 | TCYN | TRACY TRANSPORTATION | | | SCAC3 |
| 19 | TCYN | TRANSPORT CANYON INC | | | SCAC4 |
| 20 | TCYR | TRACY TRANSPORT | | | SCAC3 |
| 21 | TCYR | TRANSPORT D ST-CYR INC | | | SCAC4 |
| 22 | TCYT | TOWER CITY TRANSPORT | | | SCAC3 |
| 23 | TCYV | TRI COUNTY TRANSPORTATION | | | SCAC4 |
| 24 | TCYW | TRI-COUNTY ENTERPRISES INC | | | SCAC4 |
