| 1 | SRO | Servicios Aereos Ejecutivos Saereo, S.A. | IATA: L6, Callsign: Saereo, IATA Prefix: 532, IATA designator changed to MZ | EC | AVCODES |
| 2 | SRO | Servicios Aereos Rutas Oriente S.A. de C.V. | Callsign: Aereos Oriente, | MEX | AVCODES |
| 3 | SRO | Servicios Aereos Ejecutivos Saereo, S.A. | IATA: MZ, Callsign: Saereo, IATA Prefix: 532, IATA designator changed from L6. Founded in 1994. | EC | AVCODES |
| 4 | SRO | Servicios Aereos Ejecutivos Saereo | | | ICAO1 |
| 5 | SRO | | Real: SAR | SA | TRAFFIC |
| 6 | SRO | Saudi Railways Organization | | SA | VKM |
| 7 | SROA | SCHROEDER MOVING SYSTEMS OF MILWAUK | | | SCAC4 |
| 8 | SROB | SANCHEZ RODRIGUEZ, BENJAMIN | | | SCAC4 |
| 9 | SROC | STAR ROUTE CARRIERS, INC | | | SCAC1 |
| 10 | SROD | STITES, RONALD | | | SCAC4 |
| 11 | SROF | SUPERSONIC OF FLORIDA | | | SCAC4 |
| 12 | SROG | SUPERMARCH | | | SCAC4 |
| 13 | SROI | STEPHENSON, ROBBY OIL CO INC | | | SCAC4 |
| 14 | SROP | SIROPS MAPLE GROVE INC | | | SCAC4 |
| 15 | SROS | SOUTHERN ROSE | | | SCAC4 |
| 16 | SROT | SONORA TRUCKING | | | SCAC4 |
| 17 | SROX | Savannah River Operations Office, Atomic Energy Commission | 7/1954-7/1965 | | NAKINA |
| 18 | SROX | U.S. Atomic Energy Commission, Savannah River Operations Office | 10/1966 | | NAKINA |
| 19 | SROX | Savannah River Operations Office, Atomic Energy Commission | 4/1970-1/1975 | | NAKINA |
| 20 | SROX | United States Energy Research and Development Administration, Savannah River Operations Office | added 4/1975; eliminated 1/1978 | | NAKINA |
| 21 | SROX | U.S. Department of Energy, Savannah River Operations Office | added 1/1978; 1/1980; eliminated 1/1991 | | NAKINA |
| 22 | SROX | U.S. Department of Energy, Savannah River Operations | 7/2005 (not listed) | | NAKINA |
| 23 | SROX | Savannah River Operations Office, Atomic Energy Commission | 10/57-7/65 | | NRHS |
| 24 | SROX | U.S. Atomic Energy Commission, Savannah River Operations Office | Oct-66 | | NRHS |
| 25 | SROX | Savannah River Operations Office, Atomic Energy Commission | 4/70-1/75 | | NRHS |
| 26 | SROX | United States Energy Research and Development Administration, Savannah River Operations Office | added 4/75; eliminated 1/78 | | NRHS |
| 27 | SROX | U.S. Department of Energy, Savannah River Operations Office | added 1/78; 1/80; eliminated 1/91 | | NRHS |
| 28 | SROX | *SHERADON RAIL OPERATIONS, INC. | | | PWRC |
| 29 | SROX | +U.S. DEPT. OF ENERGY, SAVANNAH RIVER OPERATIONS | | | PWRC |
| 30 | SROX | United States Department of Energy Savannah River Operations Office | | | RSRV |
| 31 | SROX | US DEPARTMENT OF ENERGY SAVANNAH RI | | | SCAC4 |
| 32 | SROX | U.S. Department of Energy, Savannah River Operations Office | | USA | TRAFFIC |
| 33 | SROY | SUMMIT ROYAL TRANSPORT LTD | | | SCAC4 |