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
SMA SMB SMC SMD SME SMF SMG SMH SMI SMJ SMK SML SMM SMN SMO SMP SMQ SMR SMS SMT SMU SMV SMW SMX SMY SMZ
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
SMA SMB SMC SMD SME SMF SMG SMH SMI SMJ SMK SML SMM SMN SMO SMP SMQ SMR SMS SMT SMU SMV SMW SMX SMY SMZ
| 1 | SM | St. Marys R.R. Co. | 1/75; eliminated 1/79; 1/80-7/2000 | NRHS | |
| 2 | SM | ST. MARYS RAILROAD CO. | PWRC | ||
| 3 | SM | St. Marys R.R. Co. | 1/1975; eliminated 1/1979; 1/1980-7/2000; eliminated 7/2004; 7/2005 | NAKINA | |
| 4 | SM | Scandinavian Motortransport AB | SE | VKM | |
| 5 | SM | St. Mary's Railroad | RSRV | ||
| 6 | SM | SAINT MARYS RAILROAD COMPANY | SCAC4 | ||
| 7 | SMA | San Manuel Arizona R.R. Co. | 1/75-7/2000 | NRHS | |
| 8 | SMA | SMA Airlines | ICAO1 | ||
| 9 | SMA | SAN MANUEL ARIZONA RAILROAD COMPANY | PWRC | ||
| 10 | SMA | San Manuel Arizona R.R. Co. | 1/1975-7/2005 | NAKINA | |
| 11 | SMA | San Manuel Arizona Railroad | RSRV | ||
| 12 | SMAA | SEA MASTER SHIPPING GMBH | SCAC4 | ||
| 13 | SMAB | SMALL, BLAKE F | SCAC4 | ||
| 14 | SMAC | STEELMASTE | SCAC4 | ||
| 15 | SMAE | SAM EXPRESS | SCAC4 | ||
| 16 | SMAG | STATE MARINE-ISTHMIAN AGENCY INC. | PWRC | ||
| 17 | SMAH | SMITH FARM SERVICE INC | SCAC4 | ||
| 18 | SMAL | SMITH, AL MOVING AND FURNITURE CO I | SCAC4 | ||
| 19 | SMAM | STREETER, MATT L TRUCKING | SCAC4 | ||
| 20 | SMAQ | S & M TRANSPORT INC | SCAC4 | ||
| 21 | SMAR | STERLING MARINE TRANSPORT LLC | SCAC4 | ||
| 22 | SMART | SMART CORPORATION s.r.o. | SK | VKM | |
| 23 | SMAS | SOUND MOVING AND STORAGE (DIV OF JA | SCAC4 | ||
| 24 | SMAU | AUSIMONT S.P.A., MONTEDISON INTERMI | SCAC3 | ||
| 25 | SMAU | AUSIMONT S.P.A., MONTEDISON INTERMI | SCAC4 | ||
| 26 | SMAV | SUMMI | SCAC4 | ||
| 27 | SMAX | Siemens-Allis, Inc. | added 4/85; eliminated 4/86 | NRHS | |
| 28 | SMAX | Siemens | added 4/86; eliminated 10/88 | NRHS | |
| 29 | SMAX | SIEMENS INC. [SIEMENS-ALLIS, INC.] | PWRC | ||
| 30 | SMAX | Siemens-Allis, Inc. | added 4/1985; eliminated 4/1986 | NAKINA | |
| 31 | SMAX | Siemens | added 4/1986; eliminated 10/1988 | NAKINA | |
| 32 | SMBC | SIMBEL E N E | SCAC4 | ||
| 33 | SMBF | SMITH, JOHN D TRUCKING LLC | SCAC4 | ||
| 34 | SMBI | SMB MFG INC | SCAC4 | ||
| 35 | SMBJ | SMS TRUCKING INC | SCAC4 | ||
| 36 | SMBK | SIMBECK INC | SCAC4 | ||
| 37 | SMBL | SMITH BROTHERS TRANSPORT LLC | SCAC4 | ||
| 38 | SMBN | SMITH TRUCKING INC | SCAC4 | ||
| 39 | SMBO | SMITH BROTHERS TRUCKING CO INC | SCAC4 | ||
| 40 | SMBP | SMOOT BROS TRANSPORTATION | SCAC4 | ||
| 41 | SMBQ | SPECIALITES MB INC | SCAC4 | ||
| 42 | SMBR | SMT TRUCKING COMPANY | SCAC4 | ||
| 43 | SMBT | SERRATOS MOBILE HOMES | SCAC4 | ||
| 44 | SMBU | SAMBU LINE, S.A. | SCAC4 | ||
| 45 | SMBV | SOUTHERN MAINE SITEWORK INC | SCAC4 | ||
| 46 | SMBW | SHARP, MICHAEL A TRUCKING | SCAC4 | ||
| 47 | SMBY | SUPERS | SCAC4 | ||
| 48 | SMC | Sabang Merauke Raya Air Charter | ICAO1 | ||
| 49 | SMC | A. E. STALEY MANUFACTURING CO. | PWRC | ||
| 50 | SMCD | SEAMATES CONSOLIDATION SERVICE INC | SCAC4 | ||
| 51 | SMCE | SKYLINE MAIL CARRIERS INC | SCAC4 | ||
| 52 | SMCF | Sercice Militaire des Chemines de Fer | FR | VKM | |
| 53 | SMCF | SMITH CARTAGE INC | SCAC4 | ||
| 54 | SMCI | SPECIAL MACHINING CO INC | SCAC4 | ||
| 55 | SMCJ | SUMMERFORD TRUCK LINE INC | SCAC4 | ||
| 56 | SMCL | SMITH, C. L., TRUCKING | SCAC1 | ||
| 57 | SMCN | SAMS TRUCKING | SCAC4 | ||
| 58 | SMCO | SAN MARCOS TRANSFER | SCAC4 | ||
| 59 | SMCP | SECO MANUFACTURING COMPANY INC | SCAC4 | ||
| 60 | SMCQ | SMITH, W., CARTAGE COMPANY, INC | SCAC1 | ||
| 61 | SMCQ | SMITH, W CARTAGE COMPANY INC | SCAC4 | ||
| 62 | SMCT | SMITH, C R TRUCKING | SCAC4 | ||
| 63 | SMCU | ASTRIUM GMBH | SCAC4 | ||
| 64 | SMCV | SAN MARCOS GROUP LLC | SCAC4 | ||
| 65 | SMCX | The Altus Co. | added 1/62 | NRHS | |
| 66 | SMCX | *STASO MILLING CO. | PWRC | ||
| 67 | SMCX | *SIMMONS CO. | PWRC | ||
| 68 | SMCX | *STANDARD MILLING CO. [ALTUS CO.] | PWRC | ||
| 69 | SMCX | +SAN MIGUEL ELECTRIC COOPERATIVE, INC. | PWRC | ||
| 70 | SMCX | Staso Milling Co. | 7/1930-7/1932 | NAKINA | |
| 71 | SMCX | The Simmons Co. | 1/1943-1/1946 | NAKINA | |
| 72 | SMCX | The Altus Co. | added 1/1962; eliminated 1/1963 | NAKINA | |
| 73 | SMCX | Standard Milling Co. | added 1/1963; 7/1965-4/1970; eliminated 4/1972 | NAKINA | |
| 74 | SMCX | San Miguel Electric Cooperative, Inc. | added 10/1981; 1/1994-7/2005 | NAKINA | |
| 75 | SMCX | San Miguel Electric Cooperative | RSRV | ||
| 76 | SMCX | SAN MIGUEL ELECTRIC COOPERATIVE INC | SCAC4 | ||
| 77 | SMCX | Standard Milling Co. | 7/65-4/70; eliminated 4/72 | NRHS | |
| 78 | SMCX | San Miguel Electric Cooperative, Inc. | added 10/81; 1/94-7/2000 | NRHS | |
| 79 | SMCY | SUMME | SCAC4 | ||
| 80 | SMCZ | (MEC) MAINE CENTRAL | PWRC | ||
| 81 | SMCZ | Maine Central Railroad | RSRV | ||
| 82 | SMD | Servicios Aereos La Marquesa | ICAO1 | ||
| 83 | SMD | *SHOWA LINE, LTD. | PWRC | ||
| 84 | SMD | *STATE OF MARYLAND | PWRC | ||
| 85 | SMD | SLEZSKOMORAVSKÁ DRÁHA a.s. | CZ | VKM | |
| 86 | SMDA | SMD TRANSPORTATION MANAGEMENT INC | SCAC4 | ||
| 87 | SMDD | SMITH, C R SMITH TRUCKING (DEDICATE | SCAC4 | ||
| 88 | SMDG | SMITH, DENNIS TRUCKING | SCAC4 | ||
| 89 | SMDH | S M D INC | SCAC4 | ||
| 90 | SMDI | SMALL, DON & SONS OIL DISTRIBUTION | SCAC4 | ||
| 91 | SMDM | S & M TRANSPORT LLC | SCAC4 | ||
| 92 | SMDP | SLAWSON MANUFACTURING COMPANY INC | SCAC4 | ||
| 93 | SMDS | S. M. D. S | SCAC1 | ||
| 94 | SMDT | SCHMIDT AND SONS INC | SCAC4 | ||
| 95 | SMDU | 3M COMPANY | SCAC3 | ||
| 96 | SMDU | MINNESOTA MINING AND MANUFACTURING - 3M COMPANY | PWRC | ||
| 97 | SMDU | Minnesota Mining and Manufacturing (3M) | RSRV | ||
| 98 | SMDU | SPECIALTY MATERIALS DIVISION 3M COM | SCAC4 | ||
| 99 | SMDV | SUPERIOR MANUFACTURING DIVISION | SCAC4 | ||
| 100 | SME | Semos | ICAO1 |