| 1 | SOM | Aero Salmon, S.A. de C.V. | Callsign: Aero-Sal, | MEX | AVCODES |
| 2 | SOM | Somali Airlines | IATA: HH, Callsign: Somalair, | SO | AVCODES |
| 3 | SOM | Somali Airlines | | | ICAO1 |
| 4 | SOM | Somerset R.R. Corp. | added 1/1984; 1/1994-7/2005 | | NAKINA |
| 5 | SOM | Somerset R.R. Corp. | 1/94-7/2000 | | NRHS |
| 6 | SOM | SOMERSET RAILROAD CORPORATION | | | PWRC |
| 7 | SOM | Somerset Railroad | | | RSRV |
| 8 | SOM | SOMERSET RAILROAD CORPORATION | | | SCAC4 |
| 9 | SOM | Somló Volán | | H | TRAFFIC |
| 10 | SOMAF | Somafel, Engenharia e Obras Ferroviárias, S.A. | | PT | VKM |
| 11 | SOMC | SOMONT OIL COMPANY INC | | | SCAC4 |
| 12 | SOME | Somerset Railroad | Real: SOM | USA | TRAFFIC |
| 13 | SOMERSET | Somerset Bus Co | | USA | TRAFFIC |
| 14 | SOMF | SOUTHEASTERN MOTOR FREIGHT INC | | | SCAC4 |
| 15 | SOMF | Somafel | | P | TRAFFIC |
| 16 | SOMH | SAMS MOVING & OVERSEAS SHIPPING INC | | | SCAC4 |
| 17 | SOMJ | S O M & N ENTERPRISE INC | | | SCAC4 |
| 18 | SOMK | SOLKO, MIKE INC | | | SCAC4 |
| 19 | SOMM | SHOW-ME MOVERS INC | | | SCAC4 |
| 20 | SOMN | SOUTHERN MINNESOTA GROCERY TRANSPOR | | | SCAC4 |
| 21 | SOMP | STEPHENS OIL COMPANY INC | | | SCAC4 |
| 22 | SOMR | SOUTHEASTERN FUEL TRANSPORT | | | SCAC4 |
| 23 | SOMR | Somerset R.R. Corp. | Real: som | USA | TRAFFIC |
| 24 | SOMS | SOLANO MOVING & STORAGE CO | | | SCAC4 |
| 25 | SOMT | SOMAT US INC | | | SCAC4 |
| 26 | SOMU | SOMAL | | F | BIC |
| 27 | SOMU | SOMAL | | | SCAC1 |
| 28 | SOMU | SOMAL | | | SCAC4 |
| 29 | SOMX | STATE OF MISSISSIPPI | | | PWRC |
| 30 | SOMY | SUPREM | | | SCAC4 |
