| 3101 | MG | Djibouti Airlines | ICAO: DJB, IATA designator changed to L2. IATA designator changed from DY / DJU | DJI | AVCODES |
| 3102 | MG | Mediterranean Air Service | IATA designator changed to DR | TN | AVCODES |
| 3103 | MG | MGM Grand Air, Inc. | ICAO: MGM, Callsign: Grand Air, | USA | AVCODES |
| 3104 | MG | Malta Airlines | | M | AVCODES |
| 3105 | MG | Midex Airlines | ICAO: MIX, Callsign: Midexcargo, IATA Prefix: 791, | UAE | AVCODES |
| 3106 | MG | Miami Air Lease, Inc. | ICAO: MGD, Callsign: Miami Air, IATA Prefix: 424, Founded in 1971. | USA | AVCODES |
| 3107 | MG | Moaf Airways | ICAO: MOF, Callsign: Mike Golf, | IL | AVCODES |
| 3108 | MG | Eznis Airways LLC | ICAO: EZA, IATA Prefix: 116, Planned to start operations May 2018. | MGL | AVCODES |
| 3109 | MG | Mobile & Gulf R.R. Co. | 1/1975-1/1980; eliminated 10/1985 | | NAKINA |
| 3110 | MG | Mobile & Gulf R.R. Co. | 1/75-1/80 | | NRHS |
| 3111 | MG | MOBILE & GULF RAILROAD CO. | | | PWRC |
| 3112 | MG | Mobile and Gulf Railroad | | | RSRV |
| 3113 | MG | Ferrovia Monte Generoso | | CH | TRAFFIC |
| 3114 | MG | Ferrovia Monte Generoso SA | | CH | VKM |
| 3115 | MGA | M G Aviacion, S.L. | Callsign: Mag Aviacion, | E | AVCODES |
| 3116 | MGA | MG Aviacion | | | ICAO1 |
| 3117 | MGA | Norfolk Southern Ry. Co. (Norfolk Southern) | 7/2000-7/2005 | | NAKINA |
| 3118 | MGA | Consolidated Rail Corp. | added 7/1993; 1/1994; eliminated 7/1999 | | NAKINA |
| 3119 | MGA | Monongahela Ry. Co. | 8/1920-10/1966 & 1/1975-1/1980; eliminated 7/1993 | | NAKINA |
| 3120 | MGA | Monongahela Ry. Co. | 4/38-10/66 & 1/75-1/80; eliminated 7/93 | | NRHS |
| 3121 | MGA | Consolidated Rail Corp. | added 7/93; 1/94; eliminated 7/99 | | NRHS |
| 3122 | MGA | Norfolk Southern Ry. Co. (Norfolk Southern) | Jul-00 | | NRHS |
| 3123 | MGA | NORFOLK SOUTHERN RWY [CONSOLIDATED RAIL CORP.; MONONGAHELA RY] | | | PWRC |
| 3124 | MGA | Monongahela Railway (Norfolk Southern Railway) | | | RSRV |
| 3125 | MGA | Monongahela Ry. Co. | | USA | TRAFFIC |
| 3126 | MGAB | MGA LOGISTICS GROUP INC | | | SCAC4 |
| 3127 | MGAC | Monongahela Connecting R.R. Co. | 7/1965-10/1966 | | NAKINA |
| 3128 | MGAC | Monongahela Connecting R.R. Co. | 7/65-10/66 | | NRHS |
| 3129 | MGAC | MONONGAHELA CONNECTING RAILROAD CO. | | | PWRC |
| 3130 | MGAE | MEGA EXPRESS INC | | | SCAC4 |
| 3131 | MGAH | MAPLE GROVE TOWING INC | | | SCAC4 |
| 3132 | MGAJ | MEGA CARRIER CORPORATION | | | SCAC4 |
| 3133 | MGAM | MORALES GARCIA, MARCOS | | | SCAC4 |
| 3134 | MGAN | MORGAN OIL CORPORATION | | | SCAC4 |
| 3135 | MGAP | MOUNTAIN MILK HAULING INC | | | SCAC4 |
| 3136 | MGAQ | MARLOW, GERALD A | | | SCAC4 |
| 3137 | MGAR | MCCALLUM, GARY | | | SCAC4 |
| 3138 | MGAS | MORGAN SOUTHERN, INC | | | SCAC1 |
| 3139 | MGAS | MORGAN SOUTHERN INC | | | SCAC4 |
| 3140 | MGAT | MOGA TRANSPORT LTD | | | SCAC4 |
| 3141 | MGAU | BONATESTA SRL | | | SCAC4 |
| 3142 | MGAX | Moon Gasoline Co. | 7/1923-7/1932 | | NAKINA |
| 3143 | MGAX | MOON GASOLINE CO. | | | PWRC |
| 3144 | MGB | Coulson Flying Services Limited t/a Cranfield Flight Training | Callsign: Mockingbird, | GB | AVCODES |
| 3145 | MGB | Coulson Flying Service | | | ICAO1 |
| 3146 | MGB | Matterhorn-Gotthard-Bahn | MGB was created in 2003 through an amalgamation of Furka Oberalp Bahn (FO) and BVZ Zermatt-Bahn (BVZ). | CH | TRAFFIC |
| 3147 | MGB | Matterhorn Gotthard Bahn Verkehrs AG | | CH | VKM |
| 3148 | MGBC | M & G TRUCK BROKERAGE INC | | | SCAC4 |
| 3149 | MGBC | M&G Bus Company | | USA | TRAFFIC |
| 3150 | MGBH | MCMURDO, GLENN A | | | SCAC4 |
| 3151 | MGBJ | MILLER, BOB RIGGING INC | | | SCAC4 |
| 3152 | MGBM | MG TRANSPORT | | | SCAC4 |
| 3153 | MGBN | MG & BD TRUCKING | | | SCAC4 |
| 3154 | MGBP | MR G TRUCKING INC | | | SCAC4 |
| 3155 | MGBU | A P MOLLER | | | SCAC4 |
| 3156 | MGBV | MARITIME GLOBAL LOGISTICS | | | SCAC4 |
| 3157 | MGC | Magec Aviation Limited | Callsign: Magec, | GB | AVCODES |
| 3158 | MGC | Air Cargo Mongolia | Callsign: Mongolia Cargo, | MGL | AVCODES |
| 3159 | MGCD | MILGRAM & COMPANY LTD | | | SCAC4 |
| 3160 | MGCJ | MULTI GROUP LOGISTICS INC | | | SCAC4 |
| 3161 | MGCL | M G CHEMICALS LTD | | | SCAC4 |
| 3162 | MGCM | M G CABINETS & MILLWORK LTD | | | SCAC4 |
| 3163 | MGCO | MACLEOD GENERAL CONST LTD | | | SCAC4 |
| 3164 | MGCP | MORRIS, GENE COMPANY INC | | | SCAC4 |
| 3165 | MGCT | MAGIC TRANSPORT | | | SCAC4 |
| 3166 | MGCU | MAC FIELD GROUP OF COMPANIES, THE | | | SCAC4 |
| 3167 | MGCW | MTI LOGISTICS LLC | | | SCAC4 |
| 3168 | MGCX | Morrison Grain Co. | added 1/1967; eliminated 4/1967 | | NAKINA |
| 3169 | MGCX | Morrison Grain Co. | added 1/67; eliminated 4/67 | | NRHS |
| 3170 | MGCX | MORRISON GRAIN CO. | | | PWRC |
| 3171 | MGCY | MAGIC TRANSPORTATION COMPANY INC | | | SCAC4 |
| 3172 | MGD | Miami Air Lease, Inc. | IATA: MG, Callsign: Miami Air, IATA Prefix: 424, Founded in 1971. | USA | AVCODES |
| 3173 | MGDA | MAGNOLIA DISTRIBUTION OF ATLANTA IN | | | SCAC4 |
| 3174 | MGDB | MORGAN DISTRIBUTING INC | | | SCAC4 |
| 3175 | MGDE | MAGNUM DEDICATED INC | | | SCAC4 |
| 3176 | MGDG | MARTINEZ GRAJALES, DIEGO ACOMIZTLI | | | SCAC4 |
| 3177 | MGDH | MGD SHIPPING S P A | | | SCAC4 |
| 3178 | MGDJ | MCGEE, DALLAS JAMES | | | SCAC4 |
| 3179 | MGDK | MATAR GENERAL TRADE INC | | | SCAC4 |
| 3180 | MGDO | MEADOW GOLD DAIRIES | | | SCAC4 |
| 3181 | MGDP | MAG-DOUGLAS TRANSPORT CORP | | | SCAC4 |
| 3182 | MGDR | MARTIN, GERALD TRANSPORT | | | SCAC4 |
| 3183 | MGDS | MESSENGER FREIGHT SYSTEMS | | | SCAC4 |
| 3184 | MGDT | MAGDA SHIPPING LTD | | | SCAC4 |
| 3185 | MGDY | MILLS, STEVEN A TRUCKING | | | SCAC4 |
| 3186 | MGDY | Przedsiębiorstwo Komunikacji Miejskiej w Gdyni | | PL | TRAFFIC |
| 3187 | MGE | Aero Micronesia Inc d/b/a Asia Pacific Airlines | IATA: P9, Callsign: Magellan, IATA Prefix: 046, | GUM | AVCODES |
| 3188 | MGE | Asia Pacific Airlines | | | ICAO1 |
| 3189 | MGE | Asia Pacific Airlines | Based on Guam | USA | TRAFFIC |
| 3190 | MGEF | MORGAN TRANSFER INC | | | SCAC4 |
| 3191 | MGEG | MAGIC MESSENGER INC | | | SCAC4 |
| 3192 | MGEJ | MISTER G ENTERPRISE INC | | | SCAC4 |
| 3193 | MGEK | MARGIE TRUCKING CO INC | | | SCAC4 |
| 3194 | MGEL | MANGUMS INC | | | SCAC4 |
| 3195 | MGEN | MAGENTA | | | SCAC4 |
| 3196 | MGES | MARTIME-GESE | | | SCAC4 |
| 3197 | MGET | MCGEE TRUCKING | | | SCAC4 |
| 3198 | MGEU | MONTER GLOBAL LOGISTICS (S) PTE LTD | | SGP | BIC |
| 3199 | MGEW | MCGREW TRUCKING | | | SCAC4 |
| 3200 | MGF | TRTO Agency Ltd. | Callsign: Foglia, | M | AVCODES |
