| 1 | SEN | Senair Charter Ltd. | Callsign: Senex, | GB | AVCODES |
| 2 | SEN | Central Airlines (Nigeria) Limited. | IATA: HU, Callsign: Hotel Uniform, | WAN | AVCODES |
| 3 | SEN | Sevenair | IATA: UG, Callsign: Sevair, IATA Prefix: 150, Name changed to Tunisair Express w.e.f. 14 January 2011. Name changed from Tuninter, S.A. w.e.f. 07 July 2007. | TN | AVCODES |
| 4 | SEN | Senor Air | Callsign: Senior Air, | MEX | AVCODES |
| 5 | SENA | SENA INC | | | SCAC4 |
| 6 | SENB | SENATE TRANSPORT SYSTEMS INC | | | SCAC4 |
| 7 | SENC | SENECA IRON WORKS LLC | | | SCAC4 |
| 8 | SEND | Sendai City Transportation Bureau | | J | TRAFFIC |
| 9 | SENE | SOUTHEASTERN DIE RECONDITIONING INC | | | SCAC4 |
| 10 | SENF | SENTRY FUEL INC | | | SCAC4 |
| 11 | SENG | SENG, V., TEAMING CO | | | SCAC1 |
| 12 | SENG | SENG, V TEAMING COMPANY | | | SCAC4 |
| 13 | SENH | SENTINEL TRUCKING LLC | | | SCAC4 |
| 14 | SENI | SUPERIOR ENERGIES INC S DE R L DE C | | | SCAC4 |
| 15 | SENJ | SENDEJO, D TRUCKING | | | SCAC4 |
| 16 | SENL | SEN TRANS INC | | | SCAC4 |
| 17 | SENN | SEND IT | | | SCAC4 |
| 18 | SENP | STEALTH ENTERPRISES LC | | | SCAC4 |
| 19 | SENR | SPRAGUE ENERGY SOLUTIONS INC | | | SCAC4 |
| 20 | SENS | SENECHAL, EMILE & SONS LTD | | | SCAC4 |
| 21 | SENSE | Sensetalbahn | | CH | TRAFFIC |
| 22 | SENT | SELECT ENERGY SYSTEMS INC | | | SCAC4 |
| 23 | SENU | SENATOR LINIE GMBH | | | SCAC1 |
| 24 | SENU | SENATOR LINES GMBH | | | SCAC4 |
| 25 | SENV | SUPERIOR ENVIRONMENTAL SERVICES | | | SCAC4 |
| 26 | SENW | SINAI ENTERPRISES | | | SCAC4 |
| 27 | SENX | SOUTHEAST AND NORTHERN RAILROAD COMPANY | | | PWRC |
| 28 | SENY | SEA OCEAN LINES | | | SCAC4 |
