| 1 | STL | Stapleford Flight Centre | Callsign: Stapleford, | GB | AVCODES |
| 2 | STL | Stapleford Flight Centre | | | ICAO1 |
| 3 | STL | Seatrain Lines, Inc. | 1/1975-1/1980 | | NAKINA |
| 4 | STL | Seatrain Lines, Inc., Container Division | eliminated 4/1981 | | NAKINA |
| 5 | STL | Seatrain Lines, Inc. | 1/75-1/80 | | NRHS |
| 6 | STL | Seatrain Lines, Inc., Container Division | eliminated 4/81 | | NRHS |
| 7 | STL | SEATRAIN LINES, INC. | | | PWRC |
| 8 | STLB | STERLING TRANSPORTATION | | | SCAC4 |
| 9 | STLB | Steiermärkische Landesbahnen | | A | TRAFFIC |
| 10 | STLB | Steiermärkische Landesbahnen | | AT | VKM |
| 11 | STLBM | The St. Louis, Brownsville & Mexico Ry. (Gulf Coast Lines) | Real: SBM | USA | TRAFFIC |
| 12 | STLC | S T L TRANSPORT INC | | | SCAC4 |
| 13 | STLD | SEARCY TRUCKING LTD | | | SCAC4 |
| 14 | STLE | St. Louis & Evansville Railroad Co. | | | RSRV |
| 15 | STLE | SEATRADERS | | | SCAC1 |
| 16 | STLE | SEA TRADERS LINE INC | | | SCAC4 |
| 17 | STLF | ST LAWRENCE FREIGHTWAYS INC | | | SCAC4 |
| 18 | STLG | STONEHAVEN LOGISTICS LLC | | | SCAC4 |
| 19 | STLH | St. Lawrence & Hudson Ry. Co. Ltd. | 7/2000-7/2005 | | NAKINA |
| 20 | STLH | St. Lawrence & Hudson Ry. Co. Ltd. | Jul-00 | | NRHS |
| 21 | STLH | ST. LAWRENCE & HUDSON RAILWAY CO. LTD. | | | PWRC |
| 22 | STLH | St. Lawrence and Hudson Railway (Canadian Pacific Railway) | | | RSRV |
| 23 | STLH | ST LAWRENCE & HUDSON RAILWAY COMPAN | | | SCAC4 |
| 24 | STLH | St. Lawrence & Hudson Railway Company Limited | | USA | TRAFFIC |
| 25 | STLK | National Rail Corporation - SteelLink | Real: SL ? | AUS | TRAFFIC |
| 26 | STLM | STEALTH MAYFLOWER LLC | | | SCAC4 |
| 27 | STLO | STOUGHTON LOGISTICS LLC | | | SCAC4 |
| 28 | STLQ | STEEL MOBILA | | | SCAC4 |
| 29 | STLS | SAPPHIRE TRANSPORT LOGISTICS LLC | | | SCAC4 |
| 30 | STLT | SHERGILL TRANSPORT LLC | | | SCAC4 |
| 31 | STLU | SHIPPING TRADING &LIGHTERAGE CO (STALCO) | | UAE | BIC |
| 32 | STLU | (STL) MATSON NAVIGATION CO. | | | PWRC |
| 33 | STLU | Matson Navigation | | | RSRV |
| 34 | STLX | Sherbrooke Tank Line | 8/1920 | | NAKINA |
| 35 | STLX | Stauffer Chemical Co. (Southern California Branch) | 7/1930-7/1954; eliminated 7/1956 | | NAKINA |
| 36 | STLX | A.E. Staley Manufacturing Co. | added 4/1980; 1/1994-7/2000; eliminated 4/2005 | | NAKINA |
| 37 | STLX | Tate & Lyle Ingredients Americas, Inc. | added 4/2005; 7/2005 | | NAKINA |
| 38 | STLX | Stauffer Chemical Co. (Southern California Branch) | 4/38-1/52; eliminated 7/56 | | NRHS |
| 39 | STLX | A.E. Staley Manufacturing Co. | added 4/80; 1/94-7/2000 | | NRHS |
| 40 | STLX | *SHERBROOKE TANK LINE | | | PWRC |
| 41 | STLX | *STAUFFER CHEMICAL CO., SOUTHERN CALIFORNIA BRANCH | | | PWRC |
| 42 | STLX | +TATE & LYLE INGREDIENTS AMERICAS, INC. [A. E. STALEY MFG. CO.] | | | PWRC |
| 43 | STLX | A. E. Staley Manufacturing | | | RSRV |
| 44 | STLX | TATE & LYLE INGREDIENTS AMERICAS IN | | | SCAC4 |
| 45 | STLZ | (STL) MATSON NAVIGATION CO. | | | PWRC |
| 46 | STLZ | Matson Navigation | | | RSRV |
