| 9101 | SQSI | STRATEGIC LOGISTICS SOLUTIONS LLC | | | SCAC4 |
| 9102 | SQSL | SHOP QUIK STORES LLC | | | SCAC4 |
| 9103 | SQSN | SST | | | SCAC4 |
| 9104 | SQSR | SANDROCK SPECIALIZED CARRIERS INC | | | SCAC4 |
| 9105 | SQST | SEAQUEST LINE | | | SCAC4 |
| 9106 | SQTE | STETTNER INC | | | SCAC4 |
| 9107 | SQTF | STEELES TRANSFER LTD | | | SCAC4 |
| 9108 | SQTG | STONE LOGISTICS INC | | | SCAC4 |
| 9109 | SQTJ | SQUEAK TRANSPORT INC | | | SCAC4 |
| 9110 | SQTK | SPIRIT TRUCK LINES INC | | | SCAC4 |
| 9111 | SQTL | SPECTRUM TECHNOLOGIES LTD | | | SCAC4 |
| 9112 | SQTP | SELECT TRANSPORT | | | SCAC4 |
| 9113 | SQTV | SUPERIOR TRUCK SERVICES INC | | | SCAC4 |
| 9114 | SQU | Bechtel Group, Inc. | Callsign: Sequoia, | USA | AVCODES |
| 9115 | SQU | AeroSpatialle | Callsign: Remudo, Founded in 2005. | USA | AVCODES |
| 9116 | SQUC | SEA TRUCK INC | | | SCAC4 |
| 9117 | SQUM | SUMMIT NW CORP | | | SCAC4 |
| 9118 | SQUN | SUNRAY COOP | | | SCAC4 |
| 9119 | SQUP | SUNOVA IMPLEMENT LTD | | | SCAC4 |
| 9120 | SQUR | SEQUATCHIE VALLEY RAILROAD INCORPORATED | | | PWRC |
| 9121 | SQUR | SUNTRACK TRANSPORT LTD | | | SCAC4 |
| 9122 | SQUT | ST TRUCKING INC | | | SCAC4 |
| 9123 | SQV | Coastal Airways | Callsign: Coastal Air, | USA | AVCODES |
| 9124 | SQVG | STEVENS, GEO O INC | | | SCAC4 |
| 9125 | SQVP | SOLUTION IN TRANSPORTATION | | | SCAC4 |
| 9126 | SQVR | Sequatchie Valley R.R. | added 1/1987; eliminated 10/1991; 1/1994-7/2005 | | NAKINA |
| 9127 | SQVR | Sequatchie Valley R.R. | added 1/87; eliminated 10/91; 1/94-7/2000 | | NRHS |
| 9128 | SQVR | SEQUATCHIE VALLEY RAILROAD INCORPORATED | | | PWRC |
| 9129 | SQVR | Sequatchie Valley Railroad | | | RSRV |
| 9130 | SQVT | SCOTT TRUCKING SERVICE INC | | | SCAC4 |
| 9131 | SQWC | STONEWELL CORPORATION | | | SCAC4 |
| 9132 | SQXD | SUNDOWN EXPRESS LLC | | | SCAC4 |
| 9133 | SQXT | STRAIGHT SHOT EXPRESS | | | SCAC4 |
| 9134 | SR | Swiss Air Transport Co. Ltd. (Swissair) | ICAO: SWR, Callsign: Swissair, IATA Prefix: 085, Ceased Operations on 31 March 2002. | CH | AVCODES |
| 9135 | SR | Sundair GmbH | ICAO: SDR, Callsign: Sundair, Commenced operations on 27 September 2017. | D | AVCODES |
| 9136 | SR | SouthRail Corp. | added 7/1988; 1/1994; eliminated 7/1994 | | NAKINA |
| 9137 | SR | Kansas City Southern Ry. Co. | added 7/1994; 7/2000-7/2005 | | NAKINA |
| 9138 | SR | SouthRail Corp. | added 7/88; 1/94; eliminated 7/94 | | NRHS |
| 9139 | SR | Kansas City Southern Ry. Co. | added 7/94; 7/2000 | | NRHS |
| 9140 | SR | KANSAS CITY SOUTHERN RAILWAY COMPANY [SOUTHRAIL CORPORATION] | | | PWRC |
| 9141 | SR | Southrail Corp. (Kansas City Southern Railway) | | | RSRV |
| 9142 | SR | SOUTHRAIL CORPORATION | | | SCAC4 |
| 9143 | SR | Southern Railway | From the merger of the London and South Western Railway, London Brighton and South Coast Railway and South Eastern and Chatham Railway | GB | TRAFFIC |
| 9144 | SR | ScotRail Railways | | UK | VKM |
| 9145 | SRA | Sair Aviation (FAA) | Callsign: Sair, | CDN | AVCODES |
| 9146 | SRA | Sprintair Kaunus | Callsign: Sprintair Kaunus, | LT | AVCODES |
| 9147 | SRA | Sarah Airways | | MA | AVCODES |
| 9148 | SRA | Saudi Royal Aviation | Callsign: Saudi Arabian, | SA | AVCODES |
| 9149 | SRA | Sair Aviation | | | ICAO1 |
| 9150 | SRA | State Rail Authority of New South Wales | | AUS | TRAFFIC |
| 9151 | SRAA | SILVERLINE CARRIERS INC | | | SCAC4 |
| 9152 | SRAB | SELECCIONAD | | | SCAC4 |
| 9153 | SRAD | SLOAN PETROLEUM TRANSPORT LLC | | | SCAC4 |
| 9154 | SRAE | SRS ENTERTAINMENT INC | | | SCAC4 |
| 9155 | SRAF | STRATFORD TRUCKING SERVICE INC | | | SCAC4 |
| 9156 | SRAF | Southern Rhodesia Air Force | | RHO | TRAFFIC |
| 9157 | SRAG | SANRAM TRANSPORT INC | | | SCAC4 |
| 9158 | SRAIL | Stahlberg Roensch GmbH | | DE | VKM |
| 9159 | SRAJ | SANCHEZ RODRIGUEZ, ANTONIO JAVIER | | | SCAC4 |
| 9160 | SRAK | SPANISH RIVER NURSERY INC. | | | SCAC4 |
| 9161 | SRAL | SORENSEN, RANDY TRUCKING | | | SCAC4 |
| 9162 | SRAN | SIERRA INC | | | SCAC4 |
| 9163 | SRAO | SOUTH CALIFORNIA TRANSPORTATION INC | | | SCAC4 |
| 9164 | SRAP | STRABER OIL CO INC | | | SCAC4 |
| 9165 | SRAS | STRATO TRANSPORT INC | | | SCAC4 |
| 9166 | SRAT | SCRANTON TRANSFER, INC | | | SCAC1 |
| 9167 | SRAU | ENDEL SRA | | F | BIC |
| 9168 | SRAU | SRA SAVAC | | | SCAC4 |
| 9169 | SRAV | SEARSONS, THE | | | SCAC4 |
| 9170 | SRAW | SIERRA WEST EXPRESS | | | SCAC1 |
| 9171 | SRAX | The State Refining Association | 8/1920 | | NAKINA |
| 9172 | SRAX | Southern Rail Associates Inc. | added 7/2002; 7/2005 | | NAKINA |
| 9173 | SRAX | *STATE REFINING ASSOCIATION | | | PWRC |
| 9174 | SRAX | +SOUTHERN RAIL ASSOCIATES INC. | | | PWRC |
| 9175 | SRAX | Southern Rail Associates | | | RSRV |
| 9176 | SRAX | SOUTHERN RAIL ASSOCIATES INC | | | SCAC4 |
| 9177 | SRAX | Southern Rail Associates Inc. | | USA | TRAFFIC |
| 9178 | SRAY | ST ROSE NURSERY | | | SCAC4 |
| 9179 | SRB | Serb Air | Callsign: Air Serb, | BIH | AVCODES |
| 9180 | SRB | Solar Aviation Co. Ltd. | Callsign: Solar Thai, | T | AVCODES |
| 9181 | SRB | Serbian Air Force | Callsign: Serbian Air Force, | SR | AVCODES |
| 9182 | SRB | Südburgenländische Regionalbahn | | A | TRAFFIC |
| 9183 | SRB | Südburgenländische Regionalbahn | | AT | VKM |
| 9184 | SRBA | STAR BULK | | | SCAC4 |
| 9185 | SRBB | STRUBE | | | SCAC4 |
| 9186 | SRBD | SEMI RETIRED TRUCKING CO | | | SCAC4 |
| 9187 | SRBF | SENATOR SHIPPING COMPANY LIMITED | | | SCAC4 |
| 9188 | SRBI | SATURN BROKERAGE INC | | | SCAC4 |
| 9189 | SRBJ | SHARBER, J E OIL CO INC | | | SCAC4 |
| 9190 | SRBL | S A R TRANSPORTES | | | SCAC4 |
| 9191 | SRBM | STRUBLE, ROY TRUCKING INC | | | SCAC4 |
| 9192 | SRBP | SIERRA RENTAL AND TRANSPORT COMPANY | | | SCAC4 |
| 9193 | SRBQ | SCHNELL RACING STABLE | | | SCAC4 |
| 9194 | SRBR | S R F T C BROKERS | | | SCAC4 |
| 9195 | SRBS | SUNRIDGE TRANSPORTATION BROKERS | | | SCAC4 |
| 9196 | SRBU | LEIDOS | | USA | BIC |
| 9197 | SRBU | Leidos | | | RSRV |
| 9198 | SRBU | ALBERT REBERS GMBH | | | SCAC3 |
| 9199 | SRBW | SHANNON, ROBERT | | | SCAC4 |
| 9200 | SRC | Searca Ltda. | Callsign: Searca, | CO | AVCODES |
