Real world company prefixes
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S& SA SB SC SD SE SF SG SH SI SJ SK SL SM SN SO SP SQ SR SS ST SU SV SW SX SY SZ
SE& SEA SEB SEC SED SEE SEF SEG SEH SEI SEJ SEK SEL SEM SEN SEO SEP SEQ SER SES SET SEU SEV SEW SEX SEY SEZ
SEKG SEKH SEKI SEKK SEKN SEKQ SEKR SEKW SEKX
S& SA SB SC SD SE SF SG SH SI SJ SK SL SM SN SO SP SQ SR SS ST SU SV SW SX SY SZ
SE& SEA SEB SEC SED SEE SEF SEG SEH SEI SEJ SEK SEL SEM SEN SEO SEP SEQ SER SES SET SEU SEV SEW SEX SEY SEZ
SEKG SEKH SEKI SEKK SEKN SEKQ SEKR SEKW SEKX
| 1 | SEK | Skyjet | ICAO1 | ||
| 2 | SEK | Hafen- und Bahnbetriebe der Stadt Krefeld / Städtische Eisenbahn Krefeld | DE | VKM | |
| 3 | SEKG | SPEER TRUCKING LLC | SCAC4 | ||
| 4 | SEKH | SHENZHEN ENERGY LOGISTICS COMPANY L | SCAC4 | ||
| 5 | SEKI | SEKIHYO LINE (PANAMA) SA | SCAC4 | ||
| 6 | SEKK | SEEKONK OIL CORPORATION | SCAC4 | ||
| 7 | SEKN | SPEEDY EAGLE TRUCKING INC | SCAC4 | ||
| 8 | SEKQ | SPICE TRUCKING INC | SCAC4 | ||
| 9 | SEKR | Southeast Kansas R.R. Co. | added 10/88; 1/94; eliminated 10/96; 7/2000 | NRHS | |
| 10 | SEKR | SOUTHEAST KANSAS RAILROAD COMPANY | PWRC | ||
| 11 | SEKR | Southeast Kansas R.R. Co. | added 10/1988; 1/1994; eliminated 10/1996; 7/2000-7/2005 | NAKINA | |
| 12 | SEKR | Southeast Kansas Railroad | RSRV | ||
| 13 | SEKR | SOUTHEAST KANSAS RAILROAD COMPANY | SCAC4 | ||
| 14 | SEKW | SEKO WORLDWIDE LLC | SCAC4 | ||
| 15 | SEKX | SEKISUI SPECIALTY CHEMICALS AMERICA | SCAC4 |