| 3301 | MGLX | +MOBIL GRAIN, LTD | | | PWRC |
| 3302 | MGLX | MOBIL GRAIN LTD | | | SCAC4 |
| 3303 | MGLX | Mobil Grain Ltd. | | USA | TRAFFIC |
| 3304 | MGLY | MATTINGLY PRODUCTS COMPANY INC | | | SCAC4 |
| 3305 | MGM | Marie Galante Aviation | Callsign: Marie Galante, | F | AVCODES |
| 3306 | MGM | MGM Grand Air, Inc. | IATA: MG, Callsign: Grand Air, | USA | AVCODES |
| 3307 | MGM | Transporte Aero MGM | | | ICAO1 |
| 3308 | MGMA | MCGILL, MURRAY | | | SCAC4 |
| 3309 | MGMB | MGM TRANSPORT LLC | | | SCAC4 |
| 3310 | MGMC | M G M TRANSPORT CORPORATION | | | SCAC4 |
| 3311 | MGMI | MEGA MOLD INTL INC | | | SCAC4 |
| 3312 | MGMK | MGM TRUCKING INC | | | SCAC4 |
| 3313 | MGMM | MOHR GALLERANI & MORE FILMS | | | SCAC4 |
| 3314 | MGMO | MGM LINES SRL | | | SCAC4 |
| 3315 | MGMR | MGM INTERNATIONAL LLC | | | SCAC4 |
| 3316 | MGMT | MGM TRUCKING LLC | | | SCAC4 |
| 3317 | MGMU | MEGA CONTAINERS SALES, INC | | USA | BIC |
| 3318 | MGMU | Mega Containers Sales | | | RSRV |
| 3319 | MGMU | MEGA CONTAINER SALES INC | | | SCAC4 |
| 3320 | MGMV | MINNESOTA GOLD MEATS INC | | | SCAC4 |
| 3321 | MGMX | J and J Partnership | added 10/1989; eliminated 10/1993; 1/1994-7/2005 (not listed) | | NAKINA |
| 3322 | MGMX | J and J Leasing | added 4/1989; eliminated 10/1989 | | NAKINA |
| 3323 | MGMX | J and J Leasing | added 4/89; eliminated 10/89 | | NRHS |
| 3324 | MGMX | J and J Partnership | added 10/89; eliminated 10/93; 1/94-7/2000 | | NRHS |
| 3325 | MGMX | J & J PARTNERSHIP | | | PWRC |
| 3326 | MGMX | J and J Partnership | | | RSRV |
| 3327 | MGMX | J & J PARTNERSHIP | | | SCAC4 |
| 3328 | MGMY | MEGAM INC | | | SCAC4 |
| 3329 | MGN | Morgan Aviation Services Ltd. | Callsign: Morgan Air, | WAN | AVCODES |
| 3330 | MGN | MORGANS BUS TOURS | | | SCAC4 |
| 3331 | MGNB | M G & B SERVICES INC | | | SCAC4 |
| 3332 | MGNC | MAGANN ATLANTIC INC | | | SCAC4 |
| 3333 | MGND | MAGNOLIA DISTRIBUTION INCORPORATED | | | SCAC4 |
| 3334 | MGNF | MORGAN C F S INC | | | SCAC4 |
| 3335 | MGNH | METAL MANAGEMENT NORTHEAST INC | | | SCAC4 |
| 3336 | MGNI | M A G TRUCKING INC | | | SCAC4 |
| 3337 | MGNL | MAGNUM LTD | | | SCAC4 |
| 3338 | MGNQ | M & G NORTH AMERICAN | | | SCAC4 |
| 3339 | MGNS | MAGNESS TRANSPORTATION INC | | | SCAC4 |
| 3340 | MGNU | SEACUBE CONTAINERS LLC | | USA | BIC |
| 3341 | MGNU | Seacube Container Leasing | | | RSRV |
| 3342 | MGNY | MONTAGNA ENTERPRISES | | | SCAC4 |
| 3343 | MGO | Mango MG Bird SA | Callsign: Mango, | E | AVCODES |
| 3344 | MGO | Punto Fa | | | ICAO1 |
| 3345 | MGOC | MCCRAW TRANSPORT INC | | | SCAC4 |
| 3346 | MGOG | MGBR LOGISTICS INC | | | SCAC4 |
| 3347 | MGOI | MORGAN OIL INC | | | SCAC4 |
| 3348 | MGOL | MCCOLLISTERS TRANSPORTATION GROUP I | | | SCAC4 |
| 3349 | MGON | MCDERMIT, GORDON | | | SCAC4 |
| 3350 | MGOP | MEGGA ONE (1) TRANSPORT | | | SCAC4 |
| 3351 | MGOR | MS CARGO CARRIER | | | SCAC4 |
| 3352 | MGOS | MARGO SUPPLIES LTD | | | SCAC4 |
| 3353 | MGOT | MONTGOMERY TRUCKING CO | | | SCAC4 |
| 3354 | MGOY | MCGINNIS OIL CO | | | SCAC4 |
| 3355 | MGP | Arirang Aviation Limited | Callsign: Magpie, | BD | AVCODES |
| 3356 | MGP | MÁV Vasútépítő - Gépellátó és Szolgáltató Kft. | | HU | VKM |
| 3357 | MGPB | MACINTOSH GARDENING PRODUCTS INC | | | SCAC4 |
| 3358 | MGPD | MAGTEC PRODUCTS INC | | | SCAC4 |
| 3359 | MGPE | MCCALLUM GROUP ENTERPRISES INC | | | SCAC4 |
| 3360 | MGPG | MEGACORP LOGISTICS | | | SCAC4 |
| 3361 | MGPH | MILLER GROUP LLC, THE | | | SCAC4 |
| 3362 | MGPL | MG TRANSPORT LLC | | | SCAC4 |
| 3363 | MGPM | MREL GROUP OF COMPANIES LIMITED | | | SCAC4 |
| 3364 | MGPO | MAGIC TRANSPORT INC | | | SCAC4 |
| 3365 | MGPQ | MAGNOLIA TRANSPORTATION | | | SCAC4 |
| 3366 | MGPT | MOUNTAIN GROOMING EQUIPMENT | | | SCAC4 |
| 3367 | MGPU | S MOHANLAL CARGO CONTAINER PVT LTD | | IND | BIC |
| 3368 | MGPX | L.M. Martini Grape Products | 7/1932-4/1938 | | NAKINA |
| 3369 | MGPX | L.M. Martini Grape Products | Apr-38 | | NRHS |
| 3370 | MGPX | L. M. MARTINI GRAPE PRODUCTS | | | PWRC |
| 3371 | MGPY | M G OIL COMPANY | | | SCAC4 |
| 3372 | MGQA | MENA GARCIA, CESAR ALEJANDRO | | | SCAC4 |
| 3373 | MGQC | MCCANNON GRANITE CO INC | | | SCAC4 |
| 3374 | MGQE | MAGNUM ENTERPRISES LLC | | | SCAC4 |
| 3375 | MGQI | MAGIC TRANSPORTATION | | | SCAC4 |
| 3376 | MGQL | MORGAN LOGISTICS INC | | | SCAC4 |
| 3377 | MGQP | M & G TRANSPORT INC | | | SCAC4 |
| 3378 | MGQS | M & G LEASING | | | SCAC4 |
| 3379 | MGR | Magna Air GES.m.b.H. | Callsign: Magna Air, | A | AVCODES |
| 3380 | MGR | Magna Air | | | ICAO1 |
| 3381 | MGRA | MAGRA, INC | | | SCAC1 |
| 3382 | MGRA | MAGRA INC | | | SCAC4 |
| 3383 | MGRB | MCGUIRE TRANSPORTATION INC | | | SCAC4 |
| 3384 | MGRC | MORGAN CREEK TROPICALS LTD | | | SCAC4 |
| 3385 | MGRD | MAAG, RS TRANSPORTATION LLC | | | SCAC4 |
| 3386 | MGRE | MGR EXPRESS INC | | | SCAC4 |
| 3387 | MGRH | MCNELLY, GARY INC | | | SCAC4 |
| 3388 | MGRI | MG Rail, Inc. | added 10/1985; 1/1994-7/2000; eliminated 4/2004; 7/2005 | | NAKINA |
| 3389 | MGRI | MG Rail, Inc. | 1/94-7/2000 | | NRHS |
| 3390 | MGRI | M. G. RAIL, INC. | | | PWRC |
| 3391 | MGRI | MG Rail | | | RSRV |
| 3392 | MGRQ | MAGREGOR TRANSPORTATION SERVICES IN | | | SCAC4 |
| 3393 | MGRS | Ferrocarrils Nacionales de Mexico (National Rys. of Mexico) | 1/1975-1/1980 | | NAKINA |
| 3394 | MGRS | Ferrocarrils Nacionales de Mexico (National Rys. of Mexico) | 1/75-1/80 | | NRHS |
| 3395 | MGRS | FERROCARRILES NACIONALES DE MEXICO | | | PWRC |
| 3396 | MGRS | Ferrocarriles Nacionales de Mexico | | | RSRV |
| 3397 | MGRS | MARITIMA DE GRANELES S A | | | SCAC4 |
| 3398 | MGRU | MGR CONTAINER LINE PTE LTD | | | SCAC4 |
| 3399 | MGRW | MORNING STAR LOGISTICS | | | SCAC4 |
| 3400 | MGRY | MUNTER, GARY | | | SCAC4 |
