| 4201 | SGXL | SEAGULL TRANSPORT LLC | | | SCAC4 |
| 4202 | SGXM | STRAIGHT SHOT EXPRESS | | | SCAC4 |
| 4203 | SGXP | ST-GERMAIN EXPRESS INC | | | SCAC4 |
| 4204 | SGXT | SINGLE SOURCE TRANSPORTATION INC | | | SCAC4 |
| 4205 | SGXY | SGC EXPRESS | | | SCAC4 |
| 4206 | SGY | Skagway Air Service, Inc. | IATA: 7J, Callsign: Skagway Air, IATA designator changed to N5 | USA | AVCODES |
| 4207 | SGY | Skagway Air Service, Inc. | IATA: N5, Callsign: Skagway Air, IATA designator changed from 7J* | USA | AVCODES |
| 4208 | SGY | Skagway Air Service | IATA: N5 | | ICAO1 |
| 4209 | SGYA | SPENGLER SR, GARY A | | | SCAC4 |
| 4210 | SGYI | SCHWANS GLOBAL SUPPLY CHAIN INC | | | SCAC4 |
| 4211 | SGYL | SNUG S R L | | | SCAC4 |
| 4212 | SGZC | SG & M CARTAGE INC | | | SCAC4 |
| 4213 | SGZH | SALDANA GARZA, HUMBERTO | | | SCAC4 |
| 4214 | SH | Aeris | ICAO: AIS, Callsign: France Charter, Ceased operations on 07 November 2003. | F | AVCODES |
| 4215 | SH | Société Nouvelle Air Toulouse | ICAO: TLE, Callsign: Toulouse, Ceased operations | F | AVCODES |
| 4216 | SH | Servicio Aereo de Honduras, S.A. (SAHSA) | ICAO: SHA, Callsign: Sierra Hotel, Desigantor SH recalled by IATA | HN | AVCODES |
| 4217 | SH | FlyMe Sweden AB | ICAO: FLY, Callsign: Flybird, Founded in 2003. Commenced operations on 01 March 2004. Ceased operations on 02 March 2007. | S | AVCODES |
| 4218 | SH | Sharp Aviation Pty. Ltd t/a Sharp Airlines | | AUS | AVCODES |
| 4219 | SH | Sunsplash Aviation, LLC d/b/a Atlantic Airways | | VI | AVCODES |
| 4220 | SH | Steelton & Highspire R.R. Co. | 1/1975; added 1/1980; 1/1980-1/1994; eliminated 10/1999; 7/2000-7/2005 | | NAKINA |
| 4221 | SH | Steelton & Highspire R.R. Co. | 1/75; added 1/80; 1/80-1/94; eliminated 10/99; 7/2000 | | NRHS |
| 4222 | SH | STEELTON & HIGHSPIRE RAILROAD COMPANY | | | PWRC |
| 4223 | SH | Steelton and Highspire Railroad | | | RSRV |
| 4224 | SH | Steelton & Highspire | | USA | TRAFFIC |
| 4225 | SH | Smalspåret i Hultsfred AB | | SE | VKM |
| 4226 | SHA | Servicio Aereo de Honduras, S.A. (SAHSA) | Callsign: Sierra Hotel, Desigantor SH recalled by IATA. Ceased Operations during 1993 | HN | AVCODES |
| 4227 | SHA | Servicio Aereo de Honduras, S.A. (SAHSA) | IATA: SH, Callsign: Sierra Hotel, Desigantor SH recalled by IATA | HN | AVCODES |
| 4228 | SHA | Shree Airlines Pvt. Ltd. | IATA: N9, Callsign: Shree-Air, Founded in 1999. | NEP | AVCODES |
| 4229 | SHA | Lynx Aviation, Inc. | Callsign: Shasta, ICAO designator changed to SSX. Subsidiary of Republic Airways Holdings, Inc. | USA | AVCODES |
| 4230 | SHAB | SHAPP INTERNATIONAL TRADING INC | | | SCAC4 |
| 4231 | SHAD | SHADAI TRANSPORTES TERRESTRES SA DE | | | SCAC4 |
| 4232 | SHAF | SHAFFER TRUCKING INC. | | | PWRC |
| 4233 | SHAH | SHAUGHNESSY AND AHERN COMPANY | | | SCAC4 |
| 4234 | SHAI | SHIP ART INTERNATIONAL INC | | | SCAC4 |
| 4235 | SHAK | SHAKER GROUP INC | | | SCAC4 |
| 4236 | SHAM | SINGING SHAMAN TRADERS | | | SCAC4 |
| 4237 | SHAN | SHANAHAN MOTOR LINES | | | PWRC |
| 4238 | SHAN | SHUBERT HAULING | | | SCAC4 |
| 4239 | SHANG | Shanghai Metro | City: Shanghai | PRC | TRAFFIC |
| 4240 | SHAP | SHAPIRO BROS INC | | | SCAC4 |
| 4241 | SHAQ | SHORE LOGISTICS LLC | | | SCAC4 |
| 4242 | SHAS | SHARP MANUFACTURING | | | SCAC4 |
| 4243 | SHAT | SHAWMUT TRANSP CO INC | | | PWRC |
| 4244 | SHAT | SHALE TRUCKING INC | | | SCAC4 |
| 4245 | SHAT | Shatty Railway | | FAN | TRAFFIC |
| 4246 | SHAU | SHAL SEA SHIPPING LLC | | UAE | BIC |
| 4247 | SHAU | M.R. SHAH LOGISTICS PVT LTD | | | SCAC4 |
| 4248 | SHAW | SHAW ENTERPRISE INC | | | SCAC4 |
| 4249 | SHAX | Sherwin Alumina Co. | added 4/2002; 7/2005 | | NAKINA |
| 4250 | SHAX | SHERWIN ALUMINA CO. | | | PWRC |
| 4251 | SHAX | Sherwin Alumina | | | RSRV |
| 4252 | SHAX | SHERWIN ALUMINA COMPANY | | | SCAC4 |
| 4253 | SHAY | SCHNEIDER, HARRY TRUCKING INC | | | SCAC4 |
| 4254 | SHAZ | SHAW INDUSTRIES | | | PWRC |
| 4255 | SHAZ | SHAW INDUSTRIES INC | | | SCAC4 |
| 4256 | SHB | Shabair | Callsign: Shabair, | ZRE | AVCODES |
| 4257 | SHB | Shabair | | | ICAO1 |
| 4258 | SHB | Silkeborg - Herning Banen | 1877 - 1879 | DK | jernbanen.dk |
| 4259 | SHB | Schleswig Holstein Bahn GmbH | Kaltenkirchen (AKN Tochter) | D | privat-bahn.de |
| 4260 | SHB | Silkeborg - Herning Banen | 1877 - 1879 | DK | TRAFFIC |
| 4261 | SHB | Schleswig-Holstein Bahn | | DE | VKM |
| 4262 | SHBA | SHEFFIELD OIL COMPANY INC | | | SCAC4 |
| 4263 | SHBB | SHIZAR IMPORT INC | | | SCAC4 |
| 4264 | SHBC | SHANNON BROS CO INC | | | SCAC4 |
| 4265 | SHBD | SHARK TRUCKING INC | | | SCAC4 |
| 4266 | SHBJ | SHARP, RANDY | | | SCAC4 |
| 4267 | SHBL | SHI-WAY BROKERS LLC | | | SCAC4 |
| 4268 | SHBO | SCHNEIDER BROS | | | SCAC4 |
| 4269 | SHBT | SMITH BROSS TRANSPORT | | | SCAC4 |
| 4270 | SHBW | SEAHAWK LOGITECH INC | | | SCAC4 |
| 4271 | SHC | Sky Harbor Air Service, Inc. | Callsign: Sky Harbor Cheyenne, | USA | AVCODES |
| 4272 | SHC | Sky Harbor Air Service | | | ICAO1 |
| 4273 | SHC | STAR SHUTTLE & CHARTER | | | SCAC4 |
| 4274 | SHCA | SCHIPPERS CANADA LTD | | | SCAC4 |
| 4275 | SHCC | S AND H TRANSPORTATION LLC | | | SCAC4 |
| 4276 | SHCD | SOUTHERN COACHES INC | | | SCAC4 |
| 4277 | SHCF | SHALOM ENTERPRISES INC | | | SCAC4 |
| 4278 | SHCH | SHOOTING CHRONY INC | | | SCAC4 |
| 4279 | SHCI | SOUTH CENTRAL FS INC | | | SCAC4 |
| 4280 | SHCK | SHINN CONSTRUCTION INC | | | SCAC4 |
| 4281 | SHCL | SHELNIK TRANSPORTATION INC | | | SCAC4 |
| 4282 | SHCM | STREICHS LOGISTICS LLC | | | SCAC4 |
| 4283 | SHCN | SCHULTZ, C ENTERPRISES LTD | | | SCAC4 |
| 4284 | SHCO | SHIPPING CONNECTIONS INC | | | SCAC4 |
| 4285 | SHCP | SOUTHERN CONTAINER CORPORATION | | | SCAC4 |
| 4286 | SHCR | SUNTERRA HORTICULTURE (CANADA) INC | | | SCAC4 |
| 4287 | SHCT | SHEFFIELD CARTAGE INC | | | SCAC4 |
| 4288 | SHCU | SHANGHAI STAR HOUSE CO . LTD | | PRC | BIC |
| 4289 | SHCV | SCHERER, GENE & SONS TRUCKING INC | | | SCAC4 |
| 4290 | SHCW | SEA HORSE CONTAINER LINES INC | | | SCAC4 |
| 4291 | SHCY | SHIPSIDE CRATING COMPANY | | | SCAC4 |
| 4292 | SHCZ | *(HCRC) RETIRED 05-30-91 ATP (2553) | | | PWRC |
| 4293 | SHCZ | *SKYHAVEN COAL COMPANY | | | PWRC |
| 4294 | SHD | Sahara Airlines | IATA: 6S, Founded in 1998 and started operations in September 1999. Ceased operations. Designator 6S* recalled by IATA | DZ | AVCODES |
| 4295 | SHD | Sahara Airlines Limited | IATA: S2, Name changed from Sahara India Airlines Ltd. | IND | AVCODES |
| 4296 | SHD | Sahara India Airlines Ltd. | IATA: S2, Name changed to Sahara Airlines Limited | IND | AVCODES |
| 4297 | SHD | Sahara Airlines Limited t/a Air Sahara | IATA: S2, Name changed to Jet Lite (India) Limited. ICAO code JLL. Name changed from Sahara India Airlines Ltd. | IND | AVCODES |
| 4298 | SHD | Sahara Airlines | | | ICAO1 |
| 4299 | SHD | Stichting Historisch Dieselmaterieel | | NL | VKM |
| 4300 | SHDC | SHEEDY DRAYAGE CO | | | SCAC4 |
