| 3301 | DMIR | DULUTH, MISSABE & IRON RANGE RWY | | | PWRC |
| 3302 | DMIR | Duluth, Missabe and Iron Range Railway | | | RSRV |
| 3303 | DMIR | Duluth, Missabe & Iron Range Railway | | USA | TRAFFIC |
| 3304 | DMIS | DMI | | | SCAC4 |
| 3305 | DMIU | DESKTOP METAL | | USA | BIC |
| 3306 | DMIV | DOMS INTERNATIONAL SALES & | | | SCAC4 |
| 3307 | DMIW | DALVAN MARINE INC | | | SCAC4 |
| 3308 | DMIX | ADM Transportation Co. | added 1/2003; 7/2005 | | NAKINA |
| 3309 | DMIX | Minnesota Corn Processors Bulk Products Division | added 10/1995; 7/2000; eliminated 1/2003 | | NAKINA |
| 3310 | DMIX | Minnesota Corn Processors, Inc. | added 4/1995; eliminated 7/1995 | | NAKINA |
| 3311 | DMIX | Minnesota Corn Processors, Inc. | added 4/95; eliminated 7/95 | | NRHS |
| 3312 | DMIX | Minnesota Corn Processors Bulk Products Division | added 10/95; 7/2000 | | NRHS |
| 3313 | DMIX | ADM TRANSPORTATION [MINNESOTA CORN PROCESSORS BULK PRODUCTS DIVISION] | | | PWRC |
| 3314 | DMIX | ADM Transportation | | | RSRV |
| 3315 | DMIX | ADM TRANSPORTATION COMPANY | | | SCAC4 |
| 3316 | DMIX | ADM Transportation | | USA | TRAFFIC |
| 3317 | DMJ | Global Air, Grupo Aerolineas Damojh S.A. de C.V. | Callsign: Damojh, Founded in 1990. AOC revoked on 21 May 2018 by Mexican DGCA. | MEX | AVCODES |
| 3318 | DMJG | DMJ LANDSCAPING | | | SCAC4 |
| 3319 | DMJO | DIMANCHE, JOEL | | | SCAC4 |
| 3320 | DMKA | DM TRUCKING | | | SCAC4 |
| 3321 | DMKB | DT MARKETING | | | SCAC4 |
| 3322 | DMKC | DMD TRUCKING INC | | | SCAC4 |
| 3323 | DMKD | DMK DRILLING FLUIDS LTD | | | SCAC4 |
| 3324 | DMKE | DMK EXPRESS INC | | | SCAC4 |
| 3325 | DMKI | DINAMIK INC | | | SCAC4 |
| 3326 | DMKR | DMK SERVICES INC | | | SCAC4 |
| 3327 | DMKW | DEIULEMAR TANKERS SRL | | | SCAC4 |
| 3328 | DML | Aerotaxis Dosmil, S.A. de C.V. | | MEX | AVCODES |
| 3329 | DML | Getjet Airlines Latvia | Callsign: Dreamland, | LV | AVCODES |
| 3330 | DML | Aerotaxis Dosmil | | | ICAO1 |
| 3331 | DMLB | DANMAR LINES LTD (AGENTS) | | | SCAC4 |
| 3332 | DMLF | DEAN-MCCAIG INTERNATIONAL FREIGHT S | | | SCAC4 |
| 3333 | DMLH | DIAMOND MATERIALS LLC | | | SCAC4 |
| 3334 | DMLI | Diamond Logistics | | | SCAC2 |
| 3335 | DMLI | DIAMOND LOGISTICS INC | | | SCAC4 |
| 3336 | DMLM | DEL MONTE LOGISTICS | | | SCAC4 |
| 3337 | DMLN | DIRECTIONAL MINING & DRILLING LTD | | | SCAC4 |
| 3338 | DMLO | D & M LIVE CRAB INC | | | SCAC4 |
| 3339 | DMLU | DOLPHIN MOVERS LIMITED | | GB | BIC |
| 3340 | DMLV | DEFENDER MOUTHGUARD LABORATORIES LL | | | SCAC4 |
| 3341 | DMLX | General Electric Rail Services Corp. | added 4/2000; 7/2000-7/2005 | | NAKINA |
| 3342 | DMLX | General Electric Rail Services Corp. | added 4/2000; 7/2000 | | NRHS |
| 3343 | DMLX | *DRESSER MINERALS | | | PWRC |
| 3344 | DMLX | +GE RAIL SERVICES CORP. | | | PWRC |
| 3345 | DMLX | Dresser Mineral (GE Railcar Services Corporation) | | | RSRV |
| 3346 | DMLX | GENERAL ELECTRIC RAILCAR SERVICES C | | | SCAC4 |
| 3347 | DMLZ | DML CONTAINERS | | | PWRC |
| 3348 | DMLZ | DML Containers | | | RSRV |
| 3349 | DMLZ | DML CONTAINERS | | | SCAC4 |
| 3350 | DMM | Dansville & Mount Morris R.R. Co. | 1/1975-7/2005 | | NAKINA |
| 3351 | DMM | Dansville & Mount Morris R.R. Co. | 1/75-7/2000 | | NRHS |
| 3352 | DMM | DANSVILLE & MOUNT MORRIS RAILROAD CO. | | | PWRC |
| 3353 | DMM | Dansville and Mount Morris Railroad | | | RSRV |
| 3354 | DMN | Diamond Flight Academy Scandinavia AB | | S | AVCODES |
| 3355 | DMN | DULUTH, MISSABE & NORTHERN RY | | | PWRC |
| 3356 | DMNA | DAMPSKI | | | SCAC4 |
| 3357 | DMNF | DIAMOND D FARMS | | | SCAC4 |
| 3358 | DMNG | DEMING, T B | | | SCAC4 |
| 3359 | DMNI | DIMENSION | | | SCAC4 |
| 3360 | DMNL | DIAMOND LOGISTICS INC | | | SCAC4 |
| 3361 | DMNO | DM TRANSPORTATION CORPORATION | | | SCAC4 |
| 3362 | DMNR | DUTCHMASTER NURSERIES LTD | | | SCAC4 |
| 3363 | DMNT | DEMONTE FABRICATING | | | SCAC4 |
| 3364 | DMO | Domodedovo Airlines Joint Stock Aircompany | IATA: E3, Callsign: Domodedovo, IATA Prefix: 497, Name changed from Joint Stock Aircompany Domodedovo Airlines | RUS | AVCODES |
| 3365 | DMO | Joint Stock Aircompany Domodedovo Airlines | IATA: E3, Callsign: Domodedovo, IATA Prefix: 497, Name changed to Domodedovo Airlines Joint Stock Aircompany | RUS | AVCODES |
| 3366 | DMO | Domodedovo Airlines | IATA: E3 | | ICAO1 |
| 3367 | DMOD | DIAMOND TRANSPORTATION ENTERPRISES | | | SCAC4 |
| 3368 | DMOE | DEMOISE TRK-ING INC | | | SCAC4 |
| 3369 | DMOM | DIME OIL COMPANY | | | SCAC4 |
| 3370 | DMOO | DERHAAG MOTORSPORTS INC | | | SCAC4 |
| 3371 | DMOR | DERAWNDA MORGAN FARMS | | | SCAC4 |
| 3372 | DMOS | DIRECT MOVING SERVICES | | | SCAC4 |
| 3373 | DMOT | D & M TRANSPORT | | | SCAC4 |
| 3374 | DMPB | DIMPFLMEIER BAKERY LIMITED | | | SCAC4 |
| 3375 | DMPC | DMP TRUCKING INC | | | SCAC4 |
| 3376 | DMPD | DIAMONDBACK MARINE PRODUCTS LTD | | | SCAC4 |
| 3377 | DMPE | DAMPIER INC | | | SCAC4 |
| 3378 | DMPL | DOMINION PALLET INC | | | SCAC4 |
| 3379 | DMPN | DEMPSTER INDUSTRIES INC | | | SCAC4 |
| 3380 | DMPQ | DOVER I E N E | | | SCAC4 |
| 3381 | DMQ | Daallo Airlines (Somalia) | IATA: D9, Callsign: Dalo, | SO | AVCODES |
| 3382 | DMQS | DMS MOVING SYSTEMS | | | SCAC4 |
| 3383 | DMR | Helidosa Aviation Group | Callsign: Helidosa, | DOM | AVCODES |
| 3384 | DMR | Dampfbahnfreunde mittlerer Rennsteig eV | Stützerbach | D | privat-bahn.de |
| 3385 | DMR | DETROIT MANUFACTURERS RAILROAD | | | PWRC |
| 3386 | DMR | Disney World monorail | | USA | TRAFFIC |
| 3387 | DMRC | Delhi Metro Rail Corporation Ltd. | | IND | TRAFFIC |
| 3388 | DMRE | DEMETER, EDWARD | | | SCAC4 |
| 3389 | DMRJ | DMR TRUCKING INC | | | SCAC4 |
| 3390 | DMRM | DUQUE MARTINEZ, RICARDO ALEJANDRO | | | SCAC4 |
| 3391 | DMRO | DIAZ MIRANDA, ARTURO | | | SCAC4 |
| 3392 | DMRP | DEMOTRONIC CORPORATION | | | SCAC4 |
| 3393 | DMRS | DAMAR TRANSPORTATION INC | | | SCAC4 |
| 3394 | DMRV | DIAMOND TRANSPORTATION SERVICES INC | | | SCAC4 |
| 3395 | DMRX | Decker Meat Refrigerator Line (General American Transportation Corp.) | 7/1935-4/1938 | | NAKINA |
| 3396 | DMRX | Decker Meat Refrigerator Line (Jacob E. Decker & Sons) | 7/1930-7/1932 | | NAKINA |
| 3397 | DMRX | Decker Meat Refrigerator Line (General American Transportation Corp.) | Apr-38 | | NRHS |
| 3398 | DMRX | GENERAL AMERICAN TRANSPORTATION CORP. (DECKER MEAT REFRIGERATOR LINE, JOSEPH E. DECKER & SONS) | | | PWRC |
| 3399 | DMS | Air Dimension | Callsign: Air Dim, | I | AVCODES |
| 3400 | DMS | Diamond Sky OU | Callsign: Diamond, | EST | AVCODES |
