| 9701 | SRXJ | SRRT PHOENIX LLC | | | SCAC4 |
| 9702 | SRXK | STAR TAXI | | | SCAC4 |
| 9703 | SRXL | SEPTEMBER TRANSPORT LLC | | | SCAC4 |
| 9704 | SRXM | SUNRISE EXPRESS INC | | | SCAC4 |
| 9705 | SRXN | SCARLET SEA EXPRESS INC | | | SCAC4 |
| 9706 | SRXP | SUNRISE EXPRESS INC | | | SCAC4 |
| 9707 | SRXQ | SOLAR TRANSPORT LLC | | | SCAC4 |
| 9708 | SRXS | SMASHE | | | SCAC4 |
| 9709 | SRXT | S & R TRANSPORT COMPANY | | | SCAC4 |
| 9710 | SRXV | SAR TRANSPORT SYSTEMS PVT LTD | | | SCAC4 |
| 9711 | SRXX | Smith R.R. Co., Inc. | 7/2005 (not listed) | | NAKINA |
| 9712 | SRXX | SMITH RAILROAD CO., INC. | | | PWRC |
| 9713 | SRXX | SMITH RAILROAD COMPANY INC | | | SCAC4 |
| 9714 | SRXY | SITTER TRANSPORT LTD | | | SCAC4 |
| 9715 | SRY | As-Aero | | AM | AVCODES |
| 9716 | SRY | Charter Air Transport, Inc. | IATA: VC, Callsign: Stingray, Name changed to Via airlines, Inc. | USA | AVCODES |
| 9717 | SRY | Charter Air Transport, Inc. d/b/a Via Airlines | IATA: VC, Callsign: Stingray, Name changed from Charter Air Transport, Inc. | USA | AVCODES |
| 9718 | SRY | Southern Ry. of British Columbia Ltd. | added 10/1989; 1/1994-7/2005 | | NAKINA |
| 9719 | SRY | Southern Ry. of British Columbia Ltd. | added 10/89; 1/94-7/2000 | | NRHS |
| 9720 | SRY | SOUTHERN RAILWAY OF BRITISH COLUMBIA, LTD. | | | PWRC |
| 9721 | SRY | Southern Railway of British Columbia | | | RSRV |
| 9722 | SRY | Southern Railway of British Columbia | | CDN | TRAFFIC |
| 9723 | SRYC | Sierra Ry. Co. of California | 1/1994-7/2005 | | NAKINA |
| 9724 | SRYC | Sierra Ry. Co. of California | 1/94-7/2000 | | NRHS |
| 9725 | SRYC | SIERRA RAILWAY CO. OF CALIFORNIA | | | PWRC |
| 9726 | SRYC | Sierra Railway of California | | | RSRV |
| 9727 | SRYC | SIERRA RAILWAY COMPANY OF CALIFORNI | | | SCAC4 |
| 9728 | SRYC | Sierra Railway Co. of California | | USA | TRAFFIC |
| 9729 | SRYD | SURPLUS REFRIGERATION LTD | | | SCAC4 |
| 9730 | SRYE | SPRY MOVING | | | SCAC4 |
| 9731 | SRYG | SEAFOOD RESOURCING | | | SCAC4 |
| 9732 | SRYK | SIMS, RANDY TRUCKING INC | | | SCAC4 |
| 9733 | SRYL | SMITH RECYCLING | | | SCAC4 |
| 9734 | SRYN | SMITHERS ENTERPRISE INC | | | SCAC4 |
| 9735 | SRYP | SUDDATH RELOCATION SYSTEMS OF NEW Y | | | SCAC4 |
| 9736 | SRYT | SULLENS, RYAN TRANSPORT LLC | | | SCAC4 |
| 9737 | SRYX | Stanray Corp. | added 7/1962; 7/1965-10/1966; eliminated 10/1968 | | NAKINA |
| 9738 | SRYX | Stanray Corp. | 7/65-10/66; eliminated 10/68 | | NRHS |
| 9739 | SRYX | STANRAY CORP. | | | PWRC |
| 9740 | SRZ | Strato Air Services | Callsign: Strato, | ZA | AVCODES |
| 9741 | SRZ | Strato Air Services | | | ICAO1 |
| 9742 | SRZC | SHIPPINGSOURCE COM | | | SCAC4 |
| 9743 | SRZI | SRT SPECIALIZED INC | | | SCAC4 |
| 9744 | SRZJ | SANCHEZ RAMIREZ, JAIME | | | SCAC4 |
| 9745 | SRZM | STELLAR MARINE | | | SCAC4 |
| 9746 | SRZS | SUAREZ, STAN TRUCKING INC | | | SCAC4 |
| 9747 | SS | Corse Air International | ICAO: CRL, Callsign: Corsair, IATA Prefix: 923, IATA designator changed from CS. ICAO callsign changed from Charlie Sierra | F | AVCODES |
| 9748 | SS | Transportes Aereos Nacionales De Selva (TANS) | IATA designator changed to TJ* | PE | AVCODES |
| 9749 | SS | Transportes Aereos Nacionales de Selva (TANS) | ICAO: ELV, Callsign: Aereos Selva, IATA designator changed to TJ* | PE | AVCODES |
| 9750 | SS | Saggitair Limited | Callsign: Sagittair, Name changed to Sagittair Limited. | GB | AVCODES |
| 9751 | SS | Sagitair Limited | Callsign: Sagittair, Name changed from Saggittair Limited. | GB | AVCODES |
| 9752 | SS | Aerolineas Dominicanas S.A. | ICAO: ADM, Callsign: Dominair, | DOM | AVCODES |
| 9753 | SS | Sand Springs Ry. Co. | 1/1975-1/1980; added 1/1994; 7/2000-7/2005 | | NAKINA |
| 9754 | SS | Sand Springs Ry. Co. | 1/75-1/80; added 1/94; 7/2000 | | NRHS |
| 9755 | SS | SAND SPRINGS RAILWAY COMPANY | | | PWRC |
| 9756 | SS | Sand Springs Railway | | | RSRV |
| 9757 | SS | SAND SPRINGS RAILWAY COMPANY | | | SCAC4 |
| 9758 | SS | Staatsspoorwegen (State Railways) | | NL | TRAFFIC |
| 9759 | SSA | Sisav | Callsign: Sisav, | I | AVCODES |
| 9760 | SSAA | SALT SPRING AIR | | | SCAC4 |
| 9761 | SSAB | SSAB Tunnplåt AB | | SE | VKM |
| 9762 | SSAC | SS TRUCKING | | | SCAC4 |
| 9763 | SSAG | SSB TRUCKING LTD | | | SCAC4 |
| 9764 | SSAK | SMYTH MOVING SERVICE OF ALASKA INC | | | SCAC4 |
| 9765 | SSAL | SOTO SALAS, GERARDO | | | SCAC4 |
| 9766 | SSAM | Sault Ste. Marie Bridge Co. | added 4/1993; 1/1994-7/2005 | | NAKINA |
| 9767 | SSAM | Sault Ste. Marie Bridge Co. | added 4/93; 1/94-7/2000 | | NRHS |
| 9768 | SSAM | SAULT STE. MARIE BRIDGE COMPANY (WISCONSIN CENTRAL SUBSIDIARY) | | | PWRC |
| 9769 | SSAM | Sault Ste. Marie Bridge (Wisconsin Central) | | | RSRV |
| 9770 | SSAM | SAULT STE MARIE BRIDGE | | | SCAC4 |
| 9771 | SSAN | STUART, S ANTIQUES | | | SCAC4 |
| 9772 | SSANG | Ssangyong Cement Industrial Co. | | ROK | TRAFFIC |
| 9773 | SSAP | SOS TRANSPORTATION LLC | | | SCAC4 |
| 9774 | SSAT | SOLANO GONZALEZ, SANTIAGO | | | SCAC4 |
| 9775 | SSAV | SECURITY STORAGE AND VAN COMPANY | | | SCAC4 |
| 9776 | SSAY | SOUTHERN STEAMSHIP AGENCY INC | | | SCAC4 |
| 9777 | SSB | Sasair, Inc. | Callsign: Sasair, | CDN | AVCODES |
| 9778 | SSB | California Seaboard Airlines, Inc. | Callsign: Cal Seaboard, | USA | AVCODES |
| 9779 | SSB | Suasa Airlines Sdn Bhd | IATA: R9, Callsign: Suasa Air, Ceased operations. | MAL | AVCODES |
| 9780 | SSB | Sasair | | | ICAO1 |
| 9781 | SSB | | City: Stuttgart | D | TRAFFIC |
| 9782 | SSBD | SUNDANCE SEAFOOD LTD | | | SCAC4 |
| 9783 | SSBF | SOSEBEE FREIGHT LINE, INC | | | SCAC1 |
| 9784 | SSBJ | SCOTT STREET TOMATO HOUSE INC | | | SCAC4 |
| 9785 | SSBL | SELECT SHOWS BLUE UNIT LTD | | | SCAC4 |
| 9786 | SSBO | SMOOTH SHIPPING | | | SCAC4 |
| 9787 | SSBQ | SAN SILVESTRE FLETES Y ACARREOS | | | SCAC4 |
| 9788 | SSBR | SBS SPECIALIZED INC | | | SCAC4 |
| 9789 | SSBR | SSB Reisen | | D | TRAFFIC |
| 9790 | SSBT | SILVER STREAK BOATS LTD | | | SCAC4 |
| 9791 | SSBU | SPECIALIST SERVICES LLC | | UAE | BIC |
| 9792 | SSBU | SPECIALIST SERVICES LLC | | | SCAC4 |
| 9793 | SSBV | SEPSA S A DE CV | | | SCAC4 |
| 9794 | SSBX | Sun Shipbuilding Co. | 8/1920 | | NAKINA |
| 9795 | SSBX | SUN SHIPBUILDING CO. | | | PWRC |
| 9796 | SSBY | STANSHIPS INC | | | SCAC4 |
| 9797 | SSC | Southern Skies Commuter Co. | Callsign: Southern Skies, Name changed to Southern Seaplane, Inc. | USA | AVCODES |
| 9798 | SSC | Southern Seaplane, Inc. | Callsign: Southern Skies, Name changed from Southern Skies Commuter Co. | USA | AVCODES |
| 9799 | SSC | Southern Seaplane | | | ICAO1 |
| 9800 | SSC | Southern Switching Co. | added 1/1995; eliminated 7/1996; 7/2000-7/2005 | | NAKINA |
