| 2201 | SDCX | AMAX Chemical Corporation | | | RSRV |
| 2202 | SDCY | SANTARO DEVELOPMENT LLC | | | SCAC4 |
| 2203 | SDD | R I C Inc., d/b/a Skymaster Air Taxi | Callsign: Sky Dance, | USA | AVCODES |
| 2204 | SDD | Skymaster Air Taxi | | | ICAO1 |
| 2205 | SDDC | S D & L | | | SCAC4 |
| 2206 | SDDE | SCHNEIDER NATIONAL CARRIERS INC (DE | | | SCAC4 |
| 2207 | SDDG | SMITH & DOTZEL BROKERAGE INC | | | SCAC4 |
| 2208 | SDDI | SPECIAL DISPATCH OF INDIANA INC | | | SCAC4 |
| 2209 | SDDJ | SERVICIOS DE AUTOTRANSPORTES ELI S | | | SCAC4 |
| 2210 | SDDK | STUDDARD TRUCKING | | | SCAC4 |
| 2211 | SDDM | STUDDARD MOVING & STORAGE INC | | | SCAC4 |
| 2212 | SDDN | STUDDARD RELOCATION SERVICES LLC | | | SCAC4 |
| 2213 | SDDO | STANDARD OIL OF CONNECTICUT | | | SCAC4 |
| 2214 | SDDP | SUDDATH RELOCATION SYSTEMS OF PENSA | | | SCAC4 |
| 2215 | SDDQ | STRADDECK, MIKE & ASSOCIATES | | | SCAC4 |
| 2216 | SDDR | STAFFORD DISTRIBUTING | | | SCAC4 |
| 2217 | SDDS | SPECIAL DISTRIBUTION SERVICES DFW | | | SCAC4 |
| 2218 | SDDT | SUDDATH CONTAINER SERVICES INC | | | SCAC4 |
| 2219 | SDDU | SEACUBE CONTAINERS LLC | | USA | BIC |
| 2220 | SDDV | S D R EXPRESS INC | | | SCAC4 |
| 2221 | SDDW | SHOLDT DESIGN | | | SCAC4 |
| 2222 | SDDY | STANDARD TRANSPORT LTD | | | SCAC4 |
| 2223 | SDDZ | SANDUSKY DOCK | | | PWRC |
| 2224 | SDE | Oy Soder Air Ltd. | IATA: OY, Callsign: Soder, Designator OY recalled by IATA | FIN | AVCODES |
| 2225 | SDE | Oy Soder Air Ltd. | Callsign: Soder, Name changed to Airlink. Designator OY recalled by IATA | FIN | AVCODES |
| 2226 | SDE | Air Partners Corp | Callsign: Stampede, | CDN | AVCODES |
| 2227 | SDEA | SOLUTION IDEALE | | | SCAC4 |
| 2228 | SDEC | SAUDER, C H TRUCKING LLC | | | SCAC4 |
| 2229 | SDED | SPEE DEE DELIVERY SERVICE INC | | | SCAC4 |
| 2230 | SDEH | SAC DELIVERY | | | SCAC4 |
| 2231 | SDEHN | Sascha Dehn | | DE | VKM |
| 2232 | SDEJ | SMITH, D L BROTHERS TRUCKING LLC | | | SCAC4 |
| 2233 | SDEM | SMITH, DEAN TRUCKING | | | SCAC4 |
| 2234 | SDEO | SUNDOWNER EXPRESS INC | | | SCAC4 |
| 2235 | SDEQ | SHERIDAN LOGISTICS INC | | | SCAC4 |
| 2236 | SDER | SAN DIEGO ELECTRIC RAILWAY | | | PWRC |
| 2237 | SDER | San Diego Electric Railway | | | RSRV |
| 2238 | SDET | SERVICE DE TRANSPORT BERNARD LEBLAN | | | SCAC4 |
| 2239 | SDEW | SUMMIT DE | | | SCAC4 |
| 2240 | SDEX | Swindell-Dresser Energy Supply Co. | added 1/1976; 1/1980-7/2000; eliminated 4/2001 | | NAKINA |
| 2241 | SDEX | Savage-Harrington Energy | added 4/2001; eliminated 7/2005; 7/2005 (not listed) | | NAKINA |
| 2242 | SDEX | Swindell-Dresser Energy Supply Co. | 1/80-7/2000; eliminated 4/2001 | | NRHS |
| 2243 | SDEX | Savage-Harrington Energy | added 4/2001 | | NRHS |
| 2244 | SDEX | SAVAGE-HARRINGTON ENERGY [SWINDELL-DRESSLER ENERGY SUPPLY CO.] | | | PWRC |
| 2245 | SDEX | Swindell-Dressler Energy Supply | | | RSRV |
| 2246 | SDEX | SAVAGE-HARRI | | | SCAC4 |
| 2247 | SDEY | SEDIN TRUCKING | | | SCAC4 |
| 2248 | SDF | Sundorph Aeronautical Corp. | Callsign: Sundorph, | USA | AVCODES |
| 2249 | SDF | Sundorph Aeronautical Corporation | | | ICAO1 |
| 2250 | SDFC | SEA DRIFT FISH COMPANY LTD | | | SCAC4 |
| 2251 | SDFD | SAN DIEGO FOREIGN TRADE ZONE INC | | | SCAC4 |
| 2252 | SDFF | SCHANTZ, DAN FARM AND GREENHOUSES L | | | SCAC4 |
| 2253 | SDFI | SUNNYSIDE FARM TRANSIT CO | | | SCAC4 |
| 2254 | SDFJ | SUPER DUCK EXCURSIONS LLC | | | SCAC4 |
| 2255 | SDFK | SUPERLOADS-FBC INC | | | SCAC4 |
| 2256 | SDFM | SD LOGISTIC LLC | | | SCAC4 |
| 2257 | SDFN | SDF TRADING INC | | | SCAC4 |
| 2258 | SDFO | SAME DAY FUEL OIL INC | | | SCAC4 |
| 2259 | SDFS | SMITHS, DOUG FUR FARM SUPPLIES LTD | | | SCAC4 |
| 2260 | SDFT | S THREE (S3) DRIVING FORCE TRANSPOR | | | SCAC4 |
| 2261 | SDFU | DA FENG INDUSTRIAL GAS CO., LTD. | | RC | BIC |
| 2262 | SDFV | SHANNONDOE FARM | | | SCAC4 |
| 2263 | SDFW | SMT DUTY FREE INC | | | SCAC4 |
| 2264 | SDFY | SPADA FARMS | | | SCAC4 |
| 2265 | SDG | Aerosierra de Durango | Callsign: Aerosierra, | MEX | AVCODES |
| 2266 | SDG | Ghodawat Enterprises Pvt. Ltd. d/b/a Ghodawat Aviation | IATA: OG, Callsign: Hi Star, IATA designator changed to S5. | IND | AVCODES |
| 2267 | SDG | Ghodawat Enterprises Pvt. Ltd. d/b/a Ghodawat Aviation | IATA: S5, Callsign: Hi Star, Name changed to Ghodawat Enterprises Pvt. Ltd. d/b/a Star Air. IATA designator changed from OG*. | IND | AVCODES |
| 2268 | SDG | Ghodawat Enterprises Pvt. Ltd. d/b/a Star Air | IATA: S5, Callsign: Hi Star, Name changed from Ghodawat Enterprises Pvt. Ltd. d/b/a Ghodawat Aviation. IATA designator changed from OG*. | IND | AVCODES |
| 2269 | SDG | Sächsische Dampfeisenbahngesellschaft mbH | Annaberg-Buchholz | D | privat-bahn.de |
| 2270 | SDGA | STUDIO G3 GLASS LLC | | | SCAC4 |
| 2271 | SDGD | SLED DOG TRUCKING | | | SCAC4 |
| 2272 | SDGE | SHELDON, G E TRUCKING COMPANY | | | SCAC4 |
| 2273 | SDGH | SOLARIUM DESIGN GROUP LTD | | | SCAC4 |
| 2274 | SDGK | SUNDOG TRANSPORT INC | | | SCAC4 |
| 2275 | SDGR | SEATRADE GROUP NV | | | SCAC1 |
| 2276 | SDGS | SAN DIEGO TRANSPORT & LOGISTICS INC | | | SCAC4 |
| 2277 | SDGT | SPAULDING TRANSPORT | | | SCAC4 |
| 2278 | SDGU | PT. SERBA DINAMIK INDONESIA | | RI | BIC |
| 2279 | SDGW | SAN DIEGO COLD STORAGE | | | SCAC4 |
| 2280 | SDH | Servicio de Helicopteros, S.L. | Callsign: Arcos, | E | AVCODES |
| 2281 | SDH | Servicio De Helicopteros | | | ICAO1 |
| 2282 | SDHA | SUNDALE HUTTERIAN ASSOCIATION | | | SCAC4 |
| 2283 | SDHD | STANDISH OIL CO INC | | | SCAC4 |
| 2284 | SDHE | SANDHU, GURJEETPAL SINGH | | | SCAC4 |
| 2285 | SDHF | SECOND CHANCE TRANSPORTATION LLC | | | SCAC4 |
| 2286 | SDHG | SANDHU LOGISTICS | | | SCAC4 |
| 2287 | SDHH | SANDHU TRANS INC | | | SCAC4 |
| 2288 | SDHI | SUNDANCE HOLDINGS INC | | | SCAC4 |
| 2289 | SDHJ | STOREWIDE DELIVERY CO INC | | | SCAC4 |
| 2290 | SDHK | SANDHAR TRUCKING LTD | | | SCAC4 |
| 2291 | SDHL | STAFFORD, H L MOTOR TRANSPORTATION | | | SCAC4 |
| 2292 | SDHM | SIDHU HOMES INC | | | SCAC4 |
| 2293 | SDHR | SUDDATH RELOCATION SERVICES INC | | | SCAC4 |
| 2294 | SDHV | SPORT DIMENSIONS INC | | | SCAC4 |
| 2295 | SDHW | SCHNEIDER, HOWARD | | | SCAC4 |
| 2296 | SDI | Servicios Dinamicos De Aviacion, S.A. De C.V. | Callsign: Servi Dinamic, | MEX | AVCODES |
| 2297 | SDID | SOUTHPOINT DISTRIBUTING INC (N/K/A | | | SCAC4 |
| 2298 | SDIF | SUPERIOR DELIVERY INC | | | SCAC4 |
| 2299 | SDIG | STANDINGER S A DE C V | | | SCAC4 |
| 2300 | SDIH | SOUTHSHORE DISTRIBUTION INC | | | SCAC4 |
