| 1 | SPF | Space World Airline | Callsign: Space World, | WAN | AVCODES |
| 2 | SPF | Space World Airline | | | ICAO1 |
| 3 | SPFC | S P CARRIERS LLC | | | SCAC4 |
| 4 | SPFE | Southern Pacific Transportation Co. | 1/1975-1/1994; eliminated 10/1998 | | NAKINA |
| 5 | SPFE | Union Pacific R.R. Co. | added 10/1998; 7/2000-7/2005 | | NAKINA |
| 6 | SPFE | Southern Pacific Transportation Co. | 1/75-1/94; eliminated 10/98 | | NRHS |
| 7 | SPFE | Union Pacific R.R. Co. | added 10/98; 7/2000 | | NRHS |
| 8 | SPFE | UNION PACIFIC RAILROAD [SOUTHERN PACIFIC TRANSP. CO.; PACIFIC FRUIT EXPRESS] | | | PWRC |
| 9 | SPFE | Pacific Fruit Express (Union Pacific Railroad) | | | RSRV |
| 10 | SPFG | SUPREME EXPRESS INC | | | SCAC4 |
| 11 | SPFH | SPRING FARM HOLDINGS LTD | | | SCAC4 |
| 12 | SPFI | SHIPPERS FREIGHT SERVICES, INC | | | SCAC1 |
| 13 | SPFI | SHIPPERS FREIGHT SERVICES INC | | | SCAC4 |
| 14 | SPFK | SHOPFREIGHT INC | | | SCAC4 |
| 15 | SPFL | SERVICIO PUBLICO FEDERAL Y LOCAL | | | SCAC4 |
| 16 | SPFM | STONEY POINT FREIGHTWAYS LTD | | | SCAC4 |
| 17 | SPFO | SUPERIOR FIBERS LLC | | | SCAC4 |
| 18 | SPFQ | SEA VISION SHIPPING S A | | | SCAC4 |
| 19 | SPFS | STAMPEDE FREIGHT SYSTEMS INC | | | SCAC4 |
| 20 | SPFU | SOUTH PACIFIC SHIPPING LTD | | | SCAC4 |
| 21 | SPFV | SHARPE BROS INC | | | SCAC4 |
| 22 | SPFZ | UNION PACIFIC [SOUTHERN PACIFIC TRANSP CO] | | | PWRC |
| 23 | SPFZ | Southern Pacific Railroad (Union Pacific Railroad) | | | RSRV |
| 24 | SPFZ | UNION PACIFIC RAILROAD COMPANY | | | SCAC4 |
