| 1 | SGL | Senegalair | Callsign: Senair, | SN | AVCODES |
| 2 | SGL | Spacegrand Aviation Services Limited | Callsign: Spacegrand, | GB | AVCODES |
| 3 | SGL | Sigma Airlines LLP | Callsign: Sigair, AOC Suspended by Authorities on 22/06/2020. Commenced operations during January 2017. | KZ | AVCODES |
| 4 | SGL | 7Star Global Airlines Limited | Callsign: Star Wings, | WAN | AVCODES |
| 5 | SGL | Schienen Güter Logistik GmbH | Dachau | D | privat-bahn.de |
| 6 | SGL | SGL Schienen Güter Logistik GmbH | | D | TRAFFIC |
| 7 | SGL | Schienen Güter Logistik GmbH | | DE | VKM |
| 8 | SGLB | STARLITE LOGISTICS INC | | | SCAC4 |
| 9 | SGLC | STARGATE LOGISTICS LTD | | | SCAC4 |
| 10 | SGLD | SOUTH GOLD CORP | | | SCAC4 |
| 11 | SGLH | SUN CITY LOGISTICS | | | SCAC4 |
| 12 | SGLI | S & G LEASING INC | | | SCAC4 |
| 13 | SGLK | SALEM GLOBAL LOGISTICS INC | | | SCAC4 |
| 14 | SGLL | SEAGULL SERVICES SA PANAMA | | | SCAC4 |
| 15 | SGLM | SERVICE G L PARADIS INC | | | SCAC4 |
| 16 | SGLO | SINGLE GROUP LOGISTICS CORP | | | SCAC4 |
| 17 | SGLQ | STEGALL, T G TRUCKING COMPANY INC | | | SCAC4 |
| 18 | SGLR | Seminole Gulf Ry. L.P. | added 4/1988; 1/1994-7/2005; eliminated 7/2008; added 4/2009 | | NAKINA |
| 19 | SGLR | Seminole Gulf Ry. L.P. | added 4/88; 1/94-7/2000 | | NRHS |
| 20 | SGLR | SEMINOLE GULF RAILWAY | | | PWRC |
| 21 | SGLR | Seminole Gulf Railway | | | RSRV |
| 22 | SGLR | SEMINOLE GULF RAILWAY L P | | | SCAC4 |
| 23 | SGLR | Seminole Gulf | | USA | TRAFFIC |
| 24 | SGLU | SICGIL INDUSTRIAL GASES LTD | | IND | BIC |
| 25 | SGLV | SGLS INC | | | SCAC4 |
| 26 | SGLW | SOUTHERN GLOBAL LOGISTICS LLC | | | SCAC4 |
| 27 | SGLY | STEAGALL OIL CO INC | | | SCAC4 |
| 28 | SGLZ | GENERAL ELECTRIC | | | PWRC |
