| 1 | EM | Empire Airlines | ICAO: CFS, Callsign: Empire Air, IATA Prefix: 464, | USA | AVCODES |
| 2 | EM | Western Airlines | Designator EM* recalled by IATA | AUS | AVCODES |
| 3 | EM | Aero Benin S.A. | ICAO: AEB, Callsign: Aeroben, Designator EM* recalled by IATA | DY | AVCODES |
| 4 | EM | Heli Air Monaco | ICAO: MCM, Callsign: Echo Mike, | MC | AVCODES |
| 5 | EM | Edgemoor & Manetta Ry. | 1/1975-7/2005 | | NAKINA |
| 6 | EM | Erie & Michigan Ry. & Navigation Co. | 1/1941-4/1947 | | NAKINA |
| 7 | EM | Edgemoor & Manetta Ry. | 1/75-7/2000 | | NRHS |
| 8 | EM | *EAGLES MERE RR | | | PWRC |
| 9 | EM | +EDGMOOR & MANETTA RY. | | | PWRC |
| 10 | EM | Edgemoor and Manetta Railway | | | RSRV |
| 11 | EMA | Egyptian Aviation Company | | ET | AVCODES |
| 12 | EMA | Egyptian Aviation Company | | | ICAO1 |
| 13 | EMA | Estonian Military Aviation | | EST | TRAFFIC |
| 14 | EMAB | ETERNOD MARTINEZ, ALBERTO | | | SCAC4 |
| 15 | EMAC | EMAC TRANSPORT CO INC | | | SCAC3 |
| 16 | EMAC | E M A TRANSPORT SERVICES | | | SCAC4 |
| 17 | EMAD | EMERALD TRANSPORT COMPANY | | | SCAC3 |
| 18 | EMAE | EMERALD EXPRESS INC | | | SCAC3 |
| 19 | EMAE | EMBASS | | | SCAC4 |
| 20 | EMAF | EL MUCHACHO ALEGRE TRUCKING | | | SCAC4 |
| 21 | EMAG | EMPIRE AG TRANSPORT | | | SCAC3 |
| 22 | EMAG | EMERALD TOURS | | | SCAC4 |
| 23 | EMAH | ECONOMY MOVING AND STORAGE LLC (HAL | | | SCAC4 |
| 24 | EMAI | EMERALD | | | SCAC3 |
| 25 | EMAI | EMERALD AGENCIES INC | | | SCAC4 |
| 26 | EMAJ | EMAN TRANSPORT LLC | | | SCAC4 |
| 27 | EMAK | E-MACK SERVICE INC | | | SCAC3 |
| 28 | EMAN | EMANUEL TIRE COMPANY | | | SCAC4 |
| 29 | EMAO | ELFS MANAGEMENT INC | | | SCAC4 |
| 30 | EMAR | EMERALD AIR SERVICE INC | | | SCAC3 |
| 31 | EMAS | EDDY MESSENGER SERVICE INC | | | SCAC3 |
| 32 | EMAS | EMI SCHIFFAHRT GMBH | | | SCAC4 |
| 33 | EMAT | ENTERPRISE MATERIALS CORPORATION | | | SCAC3 |
| 34 | EMAU | SEACO SRL | | BDS | BIC |
| 35 | EMAU | SNTM-CNAN | | | SCAC4 |
| 36 | EMAV | EAGLE INTERMODAL | | | SCAC4 |
| 37 | EMAX | EMAS | 1/1994-7/2005 (not listed) | | NAKINA |
| 38 | EMAX | EMAS | 1/94-7/2000 | | NRHS |
| 39 | EMAX | EMAS | | | PWRC |
| 40 | EMAX | EMAS | | | RSRV |
| 41 | EMAX | EMAS | | | SCAC4 |
| 42 | EMB | Empresa Brasileira de Aeronautica, S/A | Callsign: Embraer, | BR | AVCODES |
| 43 | EMB | Empresa Brasileira De Aeronautica | | | ICAO1 |
| 44 | EMBA | EMBASSY LIMOUSINE SERVICE INC | | | SCAC3 |
| 45 | EMBA | EMBASS | | | SCAC4 |
| 46 | EMBB | Eisenbahnmuseum Bayerischer Bahnhof zu Leipzig r.V. | Leipzig-Plagwitz | D | privat-bahn.de |
| 47 | EMBB | Eisenbahnmuseum Bayerischer Bahnhof zu Leipzig e.V | | DE | VKM |
| 48 | EMBC | E & M BUS CORP | | | SCAC3 |
| 49 | EMBC | EMPIRE BULK CARRIERS | | | SCAC4 |
| 50 | EMBE | EMBERS EXPRESS TRUCKING COMPANY INC | | | SCAC3 |
| 51 | EMBE | ENTERPRISE | | | SCAC4 |
| 52 | EMBF | EMBASSY FREIGHT INTERNATIONAL LLC | | | SCAC4 |
| 53 | EMBG | EMBA GROUP INC | | | SCAC3 |
| 54 | EMBG | EMB MFG INC | | | SCAC4 |
| 55 | EMBL | EMBASSY LIMOUSINES | | | SCAC3 |
| 56 | EMBL | EMBERLEYS TRANSPORT LTD | | | SCAC4 |
| 57 | EMBR | EMBRO FARM SYSTEMS | | | SCAC4 |
| 58 | EMBS | EMBUS INC | | | SCAC3 |
| 59 | EMBU | NORAY CONTAINERS LOGISTICS, S.L. | | E | BIC |
| 60 | EMBU | COMPAGNIE ELECTRO MECANIQUE | | | SCAC3 |
| 61 | EMBY | EMBASS | | | SCAC4 |
| 62 | EMC | ECONOWAY MOTOR COACH INC | | | SCAC4 |
| 63 | EMCA | EAST MEMPHIS CARTAGE COMPANY | | | SCAC3 |
| 64 | EMCB | EUROPA MARKET CO | | | SCAC4 |
| 65 | EMCC | EMCO CHEMICAL DISTRIBUTORS INC | | | SCAC4 |
| 66 | EMCD | ESTECASA MARITIME CO. LTD. | | | SCAC3 |
| 67 | EMCE | EMC TRANSPORTATION | | | SCAC4 |
| 68 | EMCG | EMCO GEARS | | | SCAC4 |
| 69 | EMCH | EMERSON, CHARLES | | | SCAC3 |
| 70 | EMCH | EASTERN MICHIGAN GRAIN | | | SCAC4 |
| 71 | EMCI | EMERALD CITY INTERNATIONAL | | | SCAC3 |
| 72 | EMCI | EXCEL MACHINE REPAIR | | | SCAC4 |
| 73 | EMCK | EMERICK ENTERPRISES INC | | | SCAC3 |
| 74 | EMCK | E & M TRUCKING COMPANY | | | SCAC4 |
| 75 | EMCL | ESHAM, CHARLES T | | | SCAC3 |
| 76 | EMCM | EMERALD COAST MOVING & STORAGE INC | | | SCAC3 |
| 77 | EMCM | EMCO EXPRESS LLC | | | SCAC4 |
| 78 | EMCN | EMPIRE CONTAINER & CHASSIS REPAIR I | | | SCAC3 |
| 79 | EMCO | EXPEDIENT MARITIME COMPANY LIMITED, | | | SCAC3 |
| 80 | EMCO | EXPRESS MARCO INC | | | SCAC4 |
| 81 | EMCO | Erie Mining Company | Real: ERIE | USA | TRAFFIC |
| 82 | EMCQ | EMCO GEARS CO INC | | | SCAC4 |
| 83 | EMCS | EMERALD COAST STAGES INC | | | SCAC3 |
| 84 | EMCT | EMO TRANS INC | | | SCAC3 |
| 85 | EMCU | EVERGREEN MARINE CORP (TAIWAN) LTD | | RC | BIC |
| 86 | EMCU | EVERGREEN MARINE CORP. | | | PWRC |
| 87 | EMCU | Evergreen Marine Corporation | | | RSRV |
| 88 | EMCU | EVERGREEN CONTAINER LINE | | | SCAC3 |
| 89 | EMCU | EVERGREEN MARINE CORP LTD | | | SCAC4 |
| 90 | EMCV | EMCEA INC | | | SCAC4 |
| 91 | EMCW | EMC INCORPORATED | | | SCAC3 |
| 92 | EMCW | EMERSON, C W TRANSPORT INC | | | SCAC4 |
| 93 | EMCX | Eastern Fine Paper & Pulp Division, Standard Packaging Corp. | added 4/1959; eliminated 4/1961 | | NAKINA |
| 94 | EMCX | Eastern Corp. | 1/1941-10/1957; eliminated 4/1959 | | NAKINA |
| 95 | EMCX | Eastern Manufacturing Co. | 7/1930-4/1938 | | NAKINA |
| 96 | EMCX | Eastern Manufacturing Co. | Apr-38 | | NRHS |
| 97 | EMCX | Eastern Corp. | 1/52-10/57 | | NRHS |
| 98 | EMCX | Eastern Fine Paper & Pulp Division, Standard Packaging Corp. | eliminated 4/61 | | NRHS |
| 99 | EMCX | EASTERN FINE PAPER & PULP DIV. STANDARD PACKAGING CORP. [EASTERN CORP.; EASTERN MFG. CO.] | | | PWRC |
| 100 | EMCZ | EVERGREEN INTERNATIONAL (USA) CORPORATION | | | PWRC |
