| 1 | SPR | PAL Aerospace Ltd. | Callsign: Speedair, | CDN | AVCODES |
| 2 | SPR | Eastern Flying Service Ltd. | Callsign: Speedair, | CDN | AVCODES |
| 3 | SPR | Provincial Airlines | | | ICAO1 |
| 4 | SPR | SPRECKELS SUGAR | | | PWRC |
| 5 | SPR | Sao Paulo Railway | | BR | TRAFFIC |
| 6 | SPRA | SPECIALIZED RAIL SERVICE INC | | | SCAC4 |
| 7 | SPRE | SPRING RIVER EXPRESS, | | | SCAC1 |
| 8 | SPRE | SOPREMA | | | SCAC4 |
| 9 | SPRG | SPRINGLAKE I E N E | | | SCAC4 |
| 10 | SPRK | SPENCER, ROGER TRUCKING | | | SCAC4 |
| 11 | SPRL | SUPERIOR LTD | | | SCAC4 |
| 12 | SPRM | SUPER MOON | | | SCAC4 |
| 13 | SPRN | SPRINT FORWARDERS INC | | | SCAC4 |
| 14 | SPRR | SOUTHERN PACIFIC RAILROAD | | | SCAC1 |
| 15 | SPRR | S P R DE R | | | SCAC4 |
| 16 | SPRS | SPIRIT OF DAYTONA RACING LLC | | | SCAC4 |
| 17 | SPRT | Springfield Terminal Railway Company | Real: ST | USA | TRAFFIC |
| 18 | SPRU | SUPREME BOX CO.,LTD | | USA | BIC |
| 19 | SPRU | ALDO SPINELLI TRASPORTI CONTAINERS | | | SCAC3 |
| 20 | SPRU | SUPER RECK GLOBAL PLT LTD | | | SCAC4 |
| 21 | SPRX | Spur Distributing Co., Inc. | 7/1935 | | NAKINA |
| 22 | SPRX | Seaport Central R.R., Inc. | 7/2000-7/2005 (not listed) | | NAKINA |
| 23 | SPRX | Seaport Central R.R., Inc. | Jul-00 | | NRHS |
| 24 | SPRX | *SOUTHERN APPALACHIAN RAILWAY MUSEUM | | | PWRC |
| 25 | SPRX | +SEAPORT CENTRAL RAILROAD, INC. | | | PWRC |
| 26 | SPRX | SEAPORT CENTRAL RAILROAD | | | PWRC |
| 27 | SPRX | Seaport Central Railroad | | | RSRV |
