| 1 | ERS | Red Sea Air | IATA: 7R, Callsign: Eritrean Redsea, IATA Prefix: 593, Designator 7R* recalled by IATA | ER | AVCODES |
| 2 | ERS | EASTERN RAILWAY SUPPLY | | | PWRC |
| 3 | ERS | European Rail Shuttle B.V. | City: Rotterdam | NL | TRAFFIC |
| 4 | ERS | ERS Railways | | NL | VKM |
| 5 | ERSA | ERMEWA-SAS | | FR | VKM |
| 6 | ERSB | EASY RELIABLE SHIPPING | | | SCAC4 |
| 7 | ERSC | ELSTAR SHIPPING CO., S.A. | | | SCAC3 |
| 8 | ERSC | ENRIGHT RANCH & SUPPLY CO | | | SCAC4 |
| 9 | ERSE | ENVIRONMENTAL REMEDIATION SERVICES | | | SCAC4 |
| 10 | ERSH | ERSHIP | | | SCAC3 |
| 11 | ERSH | ERSHIP S A | | | SCAC4 |
| 12 | ERSJ | ERSKINE-JOHNS COMPANY | | | SCAC3 |
| 13 | ERSM | ERNSPIKER/SMITH PARTNERSHIP | | | SCAC3 |
| 14 | ERSR | EARLY STAR TRUCKING | | | SCAC3 |
| 15 | ERSS | EXPRESS RIDER INC | | | SCAC4 |
| 16 | ERST | ERRAND SERVICE TRANSPORTATION INC | | | SCAC3 |
| 17 | ERST | EMERSON TRANSPORT | | | SCAC4 |
| 18 | ERSU | EUROSILO B.V. | | | SCAC3 |
| 19 | ERSV | EMPIRE RELOCATION SERVICES INC | | | SCAC3 |
| 20 | ERSW | E R S TRUCKING | | | SCAC3 |
| 21 | ERSX | Excel Railcar Corp. | added 4/2004; 7/2005 | | NAKINA |
| 22 | ERSX | Excel Railcar Services, Inc. | 7/2000; eliminated 10/2002; added 10/2003; eliminated 4/2004 | | NAKINA |
| 23 | ERSX | Excel Railcar Services, Inc. | Jul-00 | | NRHS |
| 24 | ERSX | EXCEL RAILCAR CORP. | | | PWRC |
| 25 | ERSX | Excel Railcar Services | | | RSRV |
| 26 | ERSX | EXCEL RAILCAR CORPORATION | | | SCAC4 |
| 27 | ERSY | EARTH SYSTEMS | | | SCAC3 |
