| 4101 | SGQL | STRAIGHT LINE TRANSPORT | | | SCAC4 |
| 4102 | SGR | Eastwind Airlines, Inc. | IATA: W9, Callsign: Stinger, Ceased operations in 1999. ICAO designator changed from BBE | USA | AVCODES |
| 4103 | SGR | Eastwind Airlines, Inc. | IATA: W9, | USA | AVCODES |
| 4104 | SGR | Senegalair | Callsign: Senair, | SN | AVCODES |
| 4105 | SGR | SkyGreece Airlines S.A. | IATA: GW, Callsign: Sky Greece, Commenced operations on 22 June 2014. Ceased operations on 03 September 2015. Founded in Athens, Greece in October 2012. | GR | AVCODES |
| 4106 | SGR | Eastwind Airlines | IATA: W9 | | ICAO1 |
| 4107 | SGR | SOUTH GEORGIA RAILROAD | | | PWRC |
| 4108 | SGRB | SHENANDOAH GROWERS INC | | | SCAC4 |
| 4109 | SGRH | SUGAR HILL TRANS INC | | | SCAC4 |
| 4110 | SGRM | STINGRAY TRANSPORTATION LTD | | | SCAC4 |
| 4111 | SGRP | SEAGROUP INC, GREENWICH CT | | | SCAC4 |
| 4112 | SGRS | SINGH, G & R & SON TRUCKING LTD | | | SCAC4 |
| 4113 | SGRU | SOGECO INTERNATIONAL SA | | CH | BIC |
| 4114 | SGRW | SUNRISE GROWERS INC | | | SCAC4 |
| 4115 | SGRX | Skip Gibbs | 7/2000-7/2005 (not listed) | | NAKINA |
| 4116 | SGRX | Skip Gibbs | Jul-00 | | NRHS |
| 4117 | SGRX | *SOUTHERN GULF RAILWAY | | | PWRC |
| 4118 | SGRX | +SKIP GIBBS | | | PWRC |
| 4119 | SGRX | Skip Gibbs | | | RSRV |
| 4120 | SGRX | SKIP GIBBS | | | SCAC4 |
| 4121 | SGS | Saskatchewan Government Executive Air Service | Callsign: Saskatchewan, | CDN | AVCODES |
| 4122 | SGS | Saskatchewan Government Executive Air Service | | | ICAO1 |
| 4123 | SGS | Sonderzug Gastronomie Schuh | | DE | VKM |
| 4124 | SGSC | SEGREST SEED CO | | | SCAC4 |
| 4125 | SGSD | SOAP GOAT SOAP SHOP, THE | | | SCAC4 |
| 4126 | SGSE | SGS EXPRESS INC | | | SCAC4 |
| 4127 | SGSG | STANDARD LOGISTICS SERVICES LLC | | | SCAC4 |
| 4128 | SGSH | SONGA SHIPMANAGEMENT LTD | | | SCAC4 |
| 4129 | SGSK | ST THOMAS CARGO AND SHIP SERVICES I | | | SCAC4 |
| 4130 | SGSL | SEAGATE SHIPPING LINES | | | SCAC1 |
| 4131 | SGSL | SEAGATE STEAMSHIP LINES INC | | | SCAC4 |
| 4132 | SGSN | SHERGILL & SONS | | | SCAC4 |
| 4133 | SGSO | SONATRACH GAS TRANSPORTATION CORPOR | | | SCAC4 |
| 4134 | SGSP | SANDIGAN SHIP SERVICES INC | | | SCAC4 |
| 4135 | SGST | SLINGSHOT TRANSPORTATION INC | | | SCAC4 |
| 4136 | SGSU | SOUTHERN GAS SERVICES LIMITED | | NZ | BIC |
| 4137 | SGSU | SOUTHERN GAS SERVICES LIMITED | | | SCAC4 |
| 4138 | SGSX | Sure-Grow Solutions, Inc. | added 10/1989; 1/1994; eliminated 10/1994 | | NAKINA |
| 4139 | SGSX | Terra International, Inc. | 7/2000-7/2005 (not listed) | | NAKINA |
| 4140 | SGSX | Sure-Grow Solutions, Inc. | added 10/89; 1/94; eliminated 10/94 | | NRHS |
| 4141 | SGSX | Terra International, Inc. | Jul-00 | | NRHS |
| 4142 | SGSX | *SURE-GROW SOLUTIONS, INC. | | | PWRC |
| 4143 | SGSX | +TERRA INTERNATIONAL INCORPORATED | | | PWRC |
| 4144 | SGSX | Terra International | | | RSRV |
| 4145 | SGSX | TERRA INTERNATIONAL INC | | | SCAC4 |
| 4146 | SGSY | SINGLE SOURCE TRANSPORTATION CO | | | SCAC4 |
| 4147 | SGT | Skygate | Callsign: Skygate, | NL | AVCODES |
| 4148 | SGT | Sagittair | | I | AVCODES |
| 4149 | SGT | Stargate Aviation CC | Callsign: Stargate, | ZA | AVCODES |
| 4150 | SGT | Skygate | | | ICAO1 |
| 4151 | SGTC | S & G TRUCKING | | | SCAC4 |
| 4152 | SGTE | STRAIGHTLINE TRANSPORT INC | | | SCAC4 |
| 4153 | SGTF | SPRAGUE TURKEY FARM INC | | | SCAC4 |
| 4154 | SGTG | SIEGEL TRUCKING LLC | | | SCAC4 |
| 4155 | SGTJ | SRC LOGISTICS INC | | | SCAC4 |
| 4156 | SGTL | S.G.T.L. | | FR | VKM |
| 4157 | SGTU | SERLUX | | L | BIC |
| 4158 | SGTU | SOGOTRA LTD | | | PWRC |
| 4159 | SGTU | Sogotra Limited | | | RSRV |
| 4160 | SGTU | SOGOTRA LTD | | | SCAC4 |
| 4161 | SGTV | SOUTH GREEN TRANSPORTAION INC | | | SCAC4 |
| 4162 | SGTW | SOUTH GATE TRUCKING | | | SCAC4 |
| 4163 | SGTY | S G TRUCKING LLC | | | SCAC4 |
| 4164 | SGU | Servicios de Aerotransportacion de Aguascalientes, S.A. de C.V. | Callsign: Sagu, | MEX | AVCODES |
| 4165 | SGU | Samgau | Callsign: Raushan, | KZ | AVCODES |
| 4166 | SGU | Sol del Paraguay Lineas Aereas S.A. | IATA: PI, Callsign: Solparaguayo, Founded on 15 May 2010. Commenced operations on 15 June 2011. Ceased operations on 01 August 2012. | PY | AVCODES |
| 4167 | SGU | Samgau | | | ICAO1 |
| 4168 | SGUA | SAGUE AUTO SERVICE INC | | | SCAC4 |
| 4169 | SGUE | SEAGULL EXPRESS INC | | | SCAC4 |
| 4170 | SGUK | SPONAUGLE TRUCKING | | | SCAC4 |
| 4171 | SGUL | SEAGULL MARINE INC | | | SCAC4 |
| 4172 | SGUO | SUPER GUA | | | SCAC4 |
| 4173 | SGUP | SUPER STAR TRUCKING LTD | | | SCAC4 |
| 4174 | SGUU | {"SONGER" LTD};ZIPCODE=198206 | | RUS | BIC |
| 4175 | SGV | Aerosegovia, S.A. | Callsign: Segovia, | NIC | AVCODES |
| 4176 | SGV | Aerosegovia | | | ICAO1 |
| 4177 | SGVA | STANDAGE COURIER SERVICE | | | SCAC4 |
| 4178 | SGVI | SUGAR SERVICES LLC | | | SCAC4 |
| 4179 | SGVS | STORAGE SERVICES INC | | | SCAC4 |
| 4180 | SGVY | Saginaw Valley Ry. Co., Inc. | 1/1994-7/2000; eliminated 10/2004 | | NAKINA |
| 4181 | SGVY | Huron and Eastern Ry. Co., Inc. | added 10/2004; 7/2005 | | NAKINA |
| 4182 | SGVY | Saginaw Valley Ry. Co., Inc. | 1/94-7/2000 | | NRHS |
| 4183 | SGVY | HURON & EASTERN RWY. CO. [SAGINAW VALLEY RAILWAY COMPANY, INC.] | | | PWRC |
| 4184 | SGVY | Saginaw Valley Railway | | | RSRV |
| 4185 | SGW | Société de Gérance de Wagons de Grande Capacité | | F | TRAFFIC |
| 4186 | SGW | SGW | | FR | VKM |
| 4187 | SGWF | SPRINGS WINDOW FASHIONS | | | SCAC4 |
| 4188 | SGWG | ST GEORGE WAREHOUSE CO OF GEORGIA I | | | SCAC4 |
| 4189 | SGWM | SMYTH, GEORGE WELDING & MACHINE SHO | | | SCAC4 |
| 4190 | SGWN | SUREGROW AGRICULTURAL TRANSPORTATIO | | | SCAC4 |
| 4191 | SGWP | SONGWON PCS CO LTD | | | SCAC4 |
| 4192 | SGWS | SCRUGGS WRECKER SERVICE INC | | | SCAC4 |
| 4193 | SGWT | SILA GROW SALES LTD | | | SCAC4 |
| 4194 | SGWZ | GRAND TRUNK WESTERN | | | PWRC |
| 4195 | SGX | Saga Airlines | IATA: H3, Founded in 2004. Ceased operations during 2013. | TR | AVCODES |
| 4196 | SGX | Saga Airlines | | | ICAO1 |
| 4197 | SGX | RETIRED 05-30-91 PER JJM | | | PWRC |
| 4198 | SGXB | SGX | | | SCAC4 |
| 4199 | SGXC | SARATOGA EXPRESS LTD | | | SCAC4 |
| 4200 | SGXE | SPRINGMAN EAGLE EXPRESS | | | SCAC4 |
