| 1 | STI | Sontair Ltd. | Callsign: Sontair, | CDN | AVCODES |
| 2 | STI | Sontair | | | ICAO1 |
| 3 | STI | Verkehrsbetriebe STI (Steffisburg-Thun-Interlaken) | | CH | TRAFFIC |
| 4 | STI | SERVTRANS INVEST S.A. | | RO | VKM |
| 5 | STIB | | City: Bruxelles | B | TRAFFIC |
| 6 | STIC | SCAN TRANS, INC | | | SCAC1 |
| 7 | STID | STIDHAM TRUCKING INC | | | SCAC4 |
| 8 | STIF | SANDERS TRANSPORTATION INC | | | SCAC4 |
| 9 | STIH | STINGER EXPRESS | | | SCAC4 |
| 10 | STII | S T SERVICES INC | | | SCAC4 |
| 11 | STIJ | STI LLC | | | SCAC4 |
| 12 | STIL | SERVICIO DE TRANSPORTE INTERNACIONA | | | SCAC4 |
| 13 | STIM | STONE EXPERTS INC, THE | | | SCAC4 |
| 14 | STIN | STINNES, HUGO SCHIFFAHRT GMBH | | | SCAC4 |
| 15 | STIO | STERLING OIL & CHEMICAL CO | | | SCAC4 |
| 16 | STIP | STEEL TRANSPORT INC | | | SCAC4 |
| 17 | STIQ | S T I INC | | | SCAC4 |
| 18 | STIS | STIMAN STEEL CO | | | SCAC4 |
| 19 | STIT | SUPER TRANSPORTE INTERNACIONAL S A | | | SCAC4 |
| 20 | STIU | ZAO STIM | | | SCAC4 |
| 21 | STIV | SOUTHPAW TRANSPORTATION INC | | | SCAC4 |
| 22 | STIVO | Société de transports interurbains du Val-d'Oise | | F | TRAFFIC |
| 23 | STIX | Stauffer Chemical Co. of Indiana | 7/1930-7/1935 | | NAKINA |
| 24 | STIX | Stauffer Chemical Co. — Eastern Branch | 7/1937-4/1938 | | NAKINA |
| 25 | STIX | Stauffer Chemical Co. | 1/1941-1/1952; eliminated 7/1956 | | NAKINA |
| 26 | STIX | Surface Transportation International, Inc. | added 4/1977; 1/1980; eliminated 4/1980 | | NAKINA |
| 27 | STIX | Southern Timber Corp. | added 10/2003; eliminated 4/2004; 7/2005 (not listed) | | NAKINA |
| 28 | STIX | Stauffer Chemical Co. | 4/38-1/52; eliminated 7/56 | | NRHS |
| 29 | STIX | Surface Transportation International, Inc. | 1/80; eliminated 4/80 | | NRHS |
| 30 | STIX | *STAUFFER CHEMICAL CO. | | | PWRC |
| 31 | STIX | *SURFACE TRANSPORTATION INTERNATIONAL, INC. | | | PWRC |
| 32 | STIX | +SOUTHERN TIMBER CORP. | | | PWRC |
| 33 | STIX | SOUTHERN TIMBER CORPORATION | | | SCAC4 |
| 34 | STIY | STAR TANK LINES INC | | | SCAC4 |
| 35 | STIZ | STINSON INDUSTRIES | | | PWRC |
