| 10101 | SSMX | Joseph Transportation Inc. | added 4/2000; 7/2000 | | NRHS |
| 10102 | SSMX | *NATIONAL MOLASSES CO. [SOUTHWESTERN SUGAR & MOLASSES CO.] | | | PWRC |
| 10103 | SSMX | +DAVID J. JOSEPH COMPANY ([JOSEPH TRANSPORTATION, INC.) | | | PWRC |
| 10104 | SSMX | Joseph Transportation | | | RSRV |
| 10105 | SSN | Bop Air (Pty) Ltd t/a Sun Air | IATA: BV, Callsign: Sunstream, Ceased operations | ZA | AVCODES |
| 10106 | SSN | AirQuarius Air Charter (PTY) Ltd. | Callsign: Sunstream, | ZA | AVCODES |
| 10107 | SSN | Bop Air (Pty) Ltd Trading As Sun Air | Callsign: Sunstream, | ZA | AVCODES |
| 10108 | SSN | Setouchi Seaplanes Inc. | Callsign: Setouchi, | J | AVCODES |
| 10109 | SSN | Airquarius Air Charter | | | ICAO1 |
| 10110 | SSN | Stoom Stichting Nederland | | NL | TRAFFIC |
| 10111 | SSN | Stoom Stichting Nederland | | NL | VKM |
| 10112 | SSNC | SUSANS TRANSPORTS | | | SCAC4 |
| 10113 | SSND | S S N EXPRESS | | | SCAC4 |
| 10114 | SSNE | SIDHU & SONS NURSERY LTD | | | SCAC4 |
| 10115 | SSNF | SAVAGE, A. R. & SON | | | SCAC4 |
| 10116 | SSNG | SEASIDE NAVIGATION APS | | | SCAC4 |
| 10117 | SSNJ | S N S WORLDWIDE INC | | | SCAC4 |
| 10118 | SSnJ | Saltsjöbanan | 1893 - | S | svenska-lok.se |
| 10119 | SSNK | SMITH & SONS TRUCKING CO | | | SCAC4 |
| 10120 | SSNL | STRESSLINE TRANSPORT INC | | | SCAC4 |
| 10121 | SSNO | SPURAS TRANSPORT | | | SCAC4 |
| 10122 | SSNP | SEVEN SEVEN FIVE NINE EIGHT FOUR (7 | | | SCAC4 |
| 10123 | SSNQ | S & S ENTERPRISES INC | | | SCAC4 |
| 10124 | SSNR | S S TRANSPORT | | | SCAC4 |
| 10125 | SSNS | SEASONS TRANSPORT LLC | | | SCAC4 |
| 10126 | SSNV | STIGALL & SONS TRANSPORTATION LLC | | | SCAC4 |
| 10127 | SSNW | SMS LINE INC | | | SCAC4 |
| 10128 | SSO | Special Scope Limited | Callsign: Dope, | GB | AVCODES |
| 10129 | SSO | S&S Orinoco Aviation C.A. | Callsign: Orinoco, | YV | AVCODES |
| 10130 | SSO | Special Scope Limited | | | ICAO1 |
| 10131 | SSO | Städtische Straßenbahn Offenbach | City: Offenbach | D | TRAFFIC |
| 10132 | SSOA | SUNSHINE OIL CO INC | | | SCAC4 |
| 10133 | SSOD | SEASHORE MARITIME LIMITED | | | SCAC4 |
| 10134 | SSOE | SIX SIX ONE TWO FIVE NINE EIGHT (66 | | | SCAC4 |
| 10135 | SSOF | SUNSHINE OIL & FUELS INC | | | SCAC4 |
| 10136 | SSOG | SAM & SONS TRUCKING | | | SCAC4 |
| 10137 | SSOI | SUN OIL TRUCKING LLC | | | SCAC4 |
| 10138 | SSOJ | SEAFOOD SOURCE OF LOUISIANA, THE | | | SCAC4 |
| 10139 | SSOK | SANCHE, SORRENTINO | | | SCAC4 |
| 10140 | SSOM | STAVANGER BLOSSOM KS | | | SCAC4 |
| 10141 | SSOO | SMALL & SMALL OIL CO INC | | | SCAC4 |
| 10142 | SSOP | SHORTS OIL COMPANY INC | | | SCAC4 |
| 10143 | SSOQ | SECURITY STORAGE & VAN COMPANY OF N | | | SCAC4 |
| 10144 | SSOR | Sisseton Southern Ry. Co. | added 1/1988; eliminated 10/1989; 1/1994-7/2005 | | NAKINA |
| 10145 | SSOR | Sisseton Southern Ry. Co. | added 1/88; eliminated 10/89; 1/94-7/2000 | | NRHS |
| 10146 | SSOR | SISSETON SOUTHERN RAILWAY CO. | | | PWRC |
| 10147 | SSOR | Sisseton Southern Railway | | | RSRV |
| 10148 | SSOR | SISSETON SOUTHERN RAILWAY CO | | | SCAC4 |
| 10149 | SSOS | SWAMP SONG STUDIO | | | SCAC4 |
| 10150 | SSOU | SASOL OLEFINS AND SURFACTANTS SOUTH | | | SCAC4 |
| 10151 | SSOV | SALVIATI & SANTORI OCEAN INC | | | SCAC4 |
| 10152 | SSOW | SECURITY STORAGE COMPANY OF WASHING | | | SCAC4 |
| 10153 | SSOX | Sunshine State Oil & Refining Co. | 8/1920-7/1923 | | NAKINA |
| 10154 | SSOX | SUNSHINE STATE OIL & REFINING CO. | | | PWRC |
| 10155 | SSOX | SSAB Oxelösund | | SE | VKM |
| 10156 | SSOY | SUNSHINE OIL COMPANY | | | SCAC4 |
| 10157 | SSP | Starspeed Ltd. | Callsign: Starspeed, | GB | AVCODES |
| 10158 | SSP | Starspeed | | | ICAO1 |
| 10159 | SSPB | Seaspan International Ltd. | 1/1994-7/2005 | | NAKINA |
| 10160 | SSPB | Seaspan International Ltd. | 1/94-7/2000 | | NRHS |
| 10161 | SSPB | SEASPAN INTERNATIONAL LTD. | | | PWRC |
| 10162 | SSPB | Seaspan International Limited | | | RSRV |
| 10163 | SSPB | SEASPAN MARINE CORPORATION | | | SCAC4 |
| 10164 | SSPC | SELENE SHIPPING & TRADING CO LTD | | | SCAC4 |
| 10165 | SSPE | SILVERSTEINS PRODUCE | | | SCAC4 |
| 10166 | SSPH | SETH SHIPPING CORP | | | SCAC4 |
| 10167 | SSPI | STANDARD SHIPPING INC | | | SCAC4 |
| 10168 | SSPL | SUPERIOR SUSPENSION PARTS LIMITED | | | SCAC4 |
| 10169 | SSPM | SCORPIO SHIP MANAGEMENT SAM, MONTE | | | SCAC4 |
| 10170 | SSPN | SUPERIOR SLAG PRODUCTS INC | | | SCAC4 |
| 10171 | SSPQ | SALHUS SHIPPING AS | | | SCAC4 |
| 10172 | SSPR | S & S TRANSPORT AND LOGISTICS | | | SCAC4 |
| 10173 | SSPS | S & S EXPRESS LLC | | | SCAC4 |
| 10174 | SSPU | SEASPEED SERVICES | | | SCAC4 |
| 10175 | SSPX | A.E. Staley Manufacturing Co. | added 4/1992; 1/1994-7/2000; eliminated 4/2005 | | NAKINA |
| 10176 | SSPX | Tate & Lyle Ingredients Americas, Inc. | added 4/2005; 7/2005 | | NAKINA |
| 10177 | SSPX | A.E. Staley Manufacturing Co. | added 4/92; 1/94-7/2000 | | NRHS |
| 10178 | SSPX | TATE & LYLE INGREDIENTS AMERICAS, INC. [(STLX) A. E. STALEY MANUFACTURING COMPANY] | | | PWRC |
| 10179 | SSPX | AE Staley Manufacturing | | | RSRV |
| 10180 | SSPX | TATE & LYLE INGREDIENTS AMERICAS IN | | | SCAC4 |
| 10181 | SSPY | STOCKROOM SUPPLY | | | SCAC4 |
| 10182 | SSQ | Sunstate Airlines (QLD) Pty Ltd. | Callsign: Sunstate, Subsidiary of Qantas. Operates as QantasLink. Founded in 1981. | AUS | AVCODES |
| 10183 | SSQ | Sunstate Airlines | | | ICAO1 |
| 10184 | SSQB | SSI EXPRESS | | | SCAC4 |
| 10185 | SSQE | SPROUSE, SIMON EUGENE | | | SCAC4 |
| 10186 | SSQF | S & S FREIGHT LOGISTICS CORP | | | SCAC4 |
| 10187 | SSQH | SAPINIERE ST HO S E N C | | | SCAC4 |
| 10188 | SSQI | SUNSET COURIER INC | | | SCAC4 |
| 10189 | SSQK | STRESSOLUTIONS LLC | | | SCAC4 |
| 10190 | SSQM | STARSHIP LOGISTICS | | | SCAC4 |
| 10191 | SSQN | SSI LINES | | | SCAC4 |
| 10192 | SSQP | STARSHIP EQUIPMENT | | | SCAC4 |
| 10193 | SSQQ | S & S PALLETS AND EQUIPMENT LLC | | | SCAC4 |
| 10194 | SSQY | S & S OIL & PROPANE CO INC | | | SCAC4 |
| 10195 | SSR | P.T. Sempati Air | IATA: SG, Callsign: Spirow, Declared Bankrupt. | RI | AVCODES |
| 10196 | SSR | Sardinian Sky Service s.r.l. | Callsign: Sardinian, | I | AVCODES |
| 10197 | SSR | S & S SHORTLINE RAILROAD | | | SCAC4 |
| 10198 | SSR | Southern Shorthaul Railroad | | AUS | TRAFFIC |
| 10199 | SSRA | S & S TRAILER SALES INC | | | SCAC4 |
| 10200 | SSRC | STARS & STRIPES RELOCATION INC | | | SCAC4 |
