| 1 | SPX | Service People Gesellschaft Fur Charter Und Service mbH | | D | AVCODES |
| 2 | SPX | Service People Gesselschaft fur Charter und Servic | | | ICAO1 |
| 3 | SPX | The Solvay Process Co. | 8/1920-4/1947 | | NAKINA |
| 4 | SPX | Solvay Process Division Allied Chemical and Dye Corp. | 1/1950-10/1957; eliminated 7/1958 | | NAKINA |
| 5 | SPX | Solvay Process Division, Allied Chemical Corp. | added 7/1958; 4/1961; eliminated 7/1964 | | NAKINA |
| 6 | SPX | The Solvay Process Co. | Apr-38 | | NRHS |
| 7 | SPX | Solvay Process Division Allied Chemical and Dye Corp. | 1/52-10/57; eliminated 7/58 | | NRHS |
| 8 | SPX | Solvay Process Division, Allied Chemical Corp. | added 7/58; 4/61; eliminated 7/64 | | NRHS |
| 9 | SPX | SOLVAY PROCESS DIV., ALLIED CHEMICAL CORP. | | | PWRC |
| 10 | SPXA | SPXACE TRANSPORT INC | | | SCAC4 |
| 11 | SPXB | SPIFF EXHIBITING SERVICES INC | | | SCAC4 |
| 12 | SPXC | SUPER EXPRES DE MEXICO | | | SCAC4 |
| 13 | SPXD | SP EXPRESS LLC | | | SCAC4 |
| 14 | SPXG | STEPCO EXPRESS INC | | | SCAC4 |
| 15 | SPXH | SOUTHERN PRIDE TRANSPORT INC | | | SCAC4 |
| 16 | SPXI | SPARTAN EXPRESS, INC | | | SCAC1 |
| 17 | SPXL | SPIRIT EXPRESS LLC | | | SCAC4 |
| 18 | SPXM | SHIPINPAX LLC | | | SCAC4 |
| 19 | SPXN | SPRINT EXPRESS | | | SCAC4 |
| 20 | SPXO | SPECIAL DISPATCH OF CALIFORNIA INC | | | SCAC4 |
| 21 | SPXQ | SHIPEX INC | | | SCAC4 |
| 22 | SPXR | SKY PACIFIC EXPRESS INC | | | SCAC4 |
| 23 | SPXS | SPIRIT EXPRESS TRUCKING INC | | | SCAC4 |
| 24 | SPXW | SCORPIO TRANSPORTATION INC | | | SCAC4 |
| 25 | SPXY | SIMPLISTIC TRANSPORTATION INC | | | SCAC4 |
