| 1 | STP | Senegal Air Transport (SAT) | Callsign: Senegal-Trans, | SN | AVCODES |
| 2 | STP | STP Airways | IATA: 5A, IATA designator changed to 8F* | STP | AVCODES |
| 3 | STP | STP Airways | IATA: 8F, Callsign: Saotome Airways, IATA designator changed from 5A* | STP | AVCODES |
| 4 | STP | | City: St. Petersburg | RUS | TRAFFIC |
| 5 | STP | Sigma Tabor Sp. z o.o. | | PL | VKM |
| 6 | STPA | Sistemi Territoriali S.p.a. | Real: SI | I | TRAFFIC |
| 7 | STPC | SNAP TOO ENTERPRISES INC | | | SCAC4 |
| 8 | STPD | STEPHENS, DAVID TRUCKING | | | SCAC4 |
| 9 | STPE | SCAPA TAPES NORTH AMERICA LTD | | | SCAC4 |
| 10 | STPG | SPARTAN TRAFFIC SERVICES CO INC | | | SCAC4 |
| 11 | STPGE | Gorelektrotrans Sankt Petersburg | | RUS | TRAFFIC |
| 12 | STPHA | SPEDI-TRANS Praha, s.r.o. | | CZ | VKM |
| 13 | STPI | SNAPP TRANSPORTATION | | | SCAC4 |
| 14 | STPK | STEPWOLF TRUCKING INC | | | SCAC4 |
| 15 | STPM | SPEED TECH PERFORMANCE 2006 LTD | | | SCAC4 |
| 16 | STPN | STEPHENS TRUCK LINES, INC. | | | SCAC1 |
| 17 | STPO | STENA TRANSPORT | | | SCAC4 |
| 18 | STPPA | Passazhiravtotrans Sankt Petersburg | City: St. Petersburg | RUS | TRAFFIC |
| 19 | STPR | SUPERTRANSPORTE | | | SCAC4 |
| 20 | STPS | SPORTS TECH PRODUCTIONS | | | SCAC4 |
| 21 | STPTP | Tretiy Park (Third parc) | City: Sankt Petersburg | RUS | TRAFFIC |
| 22 | STPU | STEP OILTOOLS (UK) LTD | | GB | BIC |
| 23 | STPX | Southern Tar Products Co. | 8/1920 | | NAKINA |
| 24 | STPX | Strategic Transport Systems, Inc. | 7/2000-7/2005 (not listed) | | NAKINA |
| 25 | STPX | Strategic Transport Systems, Inc. | Jul-00 | | NRHS |
| 26 | STPX | *SOUTHERN TAR PRODUCTS CO. | | | PWRC |
| 27 | STPX | *SOUTH TEXAS PROJECT RAILROAD | | | PWRC |
| 28 | STPX | +STRATEGIC TRANSPORT SYSTEMS, INC. | | | PWRC |
| 29 | STPX | Strategic Transport Systems | | | RSRV |
| 30 | STPZ | SANTEE COOPER POWER | | | PWRC |
