| 1 | SQV | Coastal Airways | Callsign: Coastal Air, | USA | AVCODES |
| 2 | SQVG | STEVENS, GEO O INC | | | SCAC4 |
| 3 | SQVP | SOLUTION IN TRANSPORTATION | | | SCAC4 |
| 4 | SQVR | Sequatchie Valley R.R. | added 1/1987; eliminated 10/1991; 1/1994-7/2005 | | NAKINA |
| 5 | SQVR | Sequatchie Valley R.R. | added 1/87; eliminated 10/91; 1/94-7/2000 | | NRHS |
| 6 | SQVR | SEQUATCHIE VALLEY RAILROAD INCORPORATED | | | PWRC |
| 7 | SQVR | Sequatchie Valley Railroad | | | RSRV |
| 8 | SQVT | SCOTT TRUCKING SERVICE INC | | | SCAC4 |
