| 5301 | DTNM | DAIMLER TRUCKS NORTH AMERICA LLC | | | SCAC4 |
| 5302 | DTNO | DELTA TRANSPORTATION INC | | | SCAC4 |
| 5303 | DTNR | DOT TRANSPORTATION INC | | | SCAC4 |
| 5304 | DTNT | DIRECT TRANSIT, INC. | | | PWRC |
| 5305 | DTNV | D-TRANS LLC | | | SCAC4 |
| 5306 | DTNY | DEDICATED TRANSPORTATION SYSTEMS IN | | | SCAC4 |
| 5307 | DTO | Chilean Airways | Name changed to AeroDesierto S.A. Formerly ADA - AeroDesierto Airlines. Operations commenced on 27 April 2015 | RCH | AVCODES |
| 5308 | DTO | AeroDesierto S.A. | Callsign: Aerodesierto, Name changed from Chilean Airways. | RCH | AVCODES |
| 5309 | DTO | Dampflok Tradition Oberhausen e.V | | DE | VKM |
| 5310 | DTOG | DALEY TRANSPORT LOGISTICS INC | | | SCAC4 |
| 5311 | DTOM | DEAN TRAILWAYS OF MICHIGAN | | | SCAC4 |
| 5312 | DTOT | DURRETT TRUCKIN | | | SCAC4 |
| 5313 | DTOU | TERMCOTANK SA | | CH | BIC |
| 5314 | DTOU | TERMCOTANK SA | | | SCAC4 |
| 5315 | DTP | U.S. DEPARTMENT OF TRANSPORTATION PUEBLO TEST CENTER | | | PWRC |
| 5316 | DTPI | DUNCAN THOMPSON TRANSPORTATION LLC | | | SCAC4 |
| 5317 | DTPL | DANCO TRANSPORT LTD | | | SCAC4 |
| 5318 | DTPN | DART TRANSPORT INC | | | SCAC4 |
| 5319 | DTPQ | DIAL TRANSPORT INC | | | SCAC4 |
| 5320 | DTPR | DOUGLAS TRANSPORTATION INC | | | SCAC4 |
| 5321 | DTPU | VENTURA TRADING LTD | | BM | BIC |
| 5322 | DTQL | D T L LOGISTICS | | | SCAC4 |
| 5323 | DTR | Danish Air Transport | IATA: DX, Callsign: Danish, Designator DX* reinstated by IATA | DK | AVCODES |
| 5324 | DTR | DAT Danish Air Transport | IATA: DX | | ICAO1 |
| 5325 | DTR | DORI TRANS SRL | | RO | VKM |
| 5326 | DTRA | DACHSER TRANSPORT | | | SCAC4 |
| 5327 | DTRC | DELTA TRANSPORT INC | | | SCAC4 |
| 5328 | DTRD | DISCIPLE TRUCKING | | | SCAC4 |
| 5329 | DTRE | DISTRIBUIDORA DE REFACCIONES DEL GO | | | SCAC4 |
| 5330 | DTRF | DRF TRUCKING | | | SCAC4 |
| 5331 | DTRG | D-TRANS LOGISTICS | | | SCAC4 |
| 5332 | DTRH | DAINS TRUCKING | | | SCAC4 |
| 5333 | DTRI | DISTANCE TRANSPORT INC | | | SCAC4 |
| 5334 | DTRJ | DENNY TRUCKING | | | SCAC4 |
| 5335 | DTRO | D T R TRUCKING | | | SCAC4 |
| 5336 | DTRP | DENNYS TRANSPORT | | | SCAC4 |
| 5337 | DTRQ | DIANA TRANSPORT | | | SCAC4 |
| 5338 | DTRR | Danbury Terminal Rail Road Co., Inc. | 7/2005 | | NAKINA |
| 5339 | DTRR | Danbury Terminal R.R. Co. | 7/2000 | | NAKINA |
| 5340 | DTRR | Housatonic R.R. Co., Inc. | added 7/1997; eliminated 10/1997 | | NAKINA |
| 5341 | DTRR | Danbury Terminal R.R. Co. | added 4/1993; 1/1994; eliminated 7/1997 | | NAKINA |
| 5342 | DTRR | Danbury Terminal R.R. Co. | added 4/93; 1/94; eliminated 7/97 | | NRHS |
| 5343 | DTRR | Housatonic R.R. Co., Inc. | added 7/97; eliminated 10/97 | | NRHS |
| 5344 | DTRR | Danbury Terminal R.R. Co. | Jul-00 | | NRHS |
| 5345 | DTRR | HOUSATONIC RAIL ROAD CO. [DANBURY TERMINAL RAILROAD CO.] | | | PWRC |
| 5346 | DTRR | Danbury Terminal Railroad (Housatonic Railroad) | | | RSRV |
| 5347 | DTRS | Dallas Transit System | Real: DTS, City: Dallas, The Dallas Transit System (DTS) was a public transit service operated by the city of Dallas, from 1964 to 1983. DTS was formed by the consolidation of various privately owned transit companies and streetcar lines. | US-TX | TRAFFIC |
| 5348 | DTRU | DLTK LTD | | RUS | BIC |
| 5349 | DTRV | DAVEY'S TRUCKING | | | SCAC4 |
| 5350 | DTRW | DONTRANS INC | | | SCAC4 |
| 5351 | DTRY | DANIEL TRUCKING | | | SCAC4 |
| 5352 | DTS | Grand Trunk Western R.R. Inc. | added 1/1982; 1/1994-7/2005 | | NAKINA |
| 5353 | DTS | Detroit & Toledo Shore Line R.R. Co. | 1/1975-1/1980; eliminated 1/1982 | | NAKINA |
| 5354 | DTS | (D&TS) Detroit & Toledo Shore Line R.R. Co. | 7/1965-10/1966 | | NAKINA |
| 5355 | DTS | (D&TS) Detroit & Toledo Shore Line R.R. Co. | 7/65-10/66 | | NRHS |
| 5356 | DTS | Detroit & Toledo Shore Line R.R. Co. | 1/75-1/80; eliminated 1/82 | | NRHS |
| 5357 | DTS | Grand Trunk Western R.R. Inc. | added 1/82; 1/94-7/2000 | | NRHS |
| 5358 | DTS | CANADIAN NATIONAL RAILWAY [GRAND TRUNK WESTERN RR; DETROIT & TOLEDO SHORE LINE RR] | | | PWRC |
| 5359 | DTS | Detroit and Toledo Shore Line Railroad (Canadian National Railway) | | | RSRV |
| 5360 | DTS | Detroit & Toledo Shore Line R.R. Co. | | USA | TRAFFIC |
| 5361 | DTSA | D T S | | | SCAC4 |
| 5362 | DTSB | DTS, Diversified Transfer & Storage, INC | | | SCAC1 |
| 5363 | DTSB | DTS | | | SCAC4 |
| 5364 | DTSD | DURST TRUCKING SERVICE INC | | | SCAC4 |
| 5365 | DTSE | DAMBACHER TRUCK SERVICE | | | SCAC4 |
| 5366 | DTSH | DJW TRANSFER SERVICES LLC | | | SCAC4 |
| 5367 | DTSJ | DTS | | | SCAC4 |
| 5368 | DTSL | CANADIAN NATIONAL RAILWAY [GRAND TRUNK WESTERN RR; DETROIT & TOLEDO SHORE LINE RR] | | | PWRC |
| 5369 | DTSL | DEDICATED TRANSPORTATION SERVICES | | | SCAC4 |
| 5370 | DTSM | DTSI | | | SCAC4 |
| 5371 | DTSO | D & T TRANSPORTATION | | | SCAC4 |
| 5372 | DTSR | DHALIWAL TRUCK SERVICE/D T S | | | SCAC4 |
| 5373 | DTSS | DTS TRANSPORTATION INC | | | SCAC4 |
| 5374 | DTST | DATS TRUCKING, INC | | | SCAC1 |
| 5375 | DTST | DATS TRUCKING INC | | | SCAC4 |
| 5376 | DTSW | DRYDEN TRANSPORT SYSTEMS INC | | | SCAC4 |
| 5377 | DTTE | DITTO EXPRESS INC | | | SCAC4 |
| 5378 | DTTF | DTR TRANSPORT LLC | | | SCAC4 |
| 5379 | DTTH | DART TRANS INC | | | SCAC4 |
| 5380 | DTTK | D T TRUCKING | | | SCAC4 |
| 5381 | DTTL | DENTON TRANSPORTATION SYSTEMS INC | | | SCAC4 |
| 5382 | DTTM | DITTMAN TRUCKING | | | SCAC4 |
| 5383 | DTTN | DIMENSION TRANSPORTATION INC | | | SCAC4 |
| 5384 | DTTO | DAVERT TOOLS INC | | | SCAC4 |
| 5385 | DTTR | DAYBREAK TRANSPORT | | | SCAC4 |
| 5386 | DTTS | DAVID THOMAS TOURS INC | | | SCAC4 |
| 5387 | DTTT | DON'S TRAILER TRANSPORT, INC | | | SCAC1 |
| 5388 | DTTT | DONS TRAILER TRANSPORT INC | | | SCAC4 |
| 5389 | DTTV | D-TRUX TRANSPORT LTD | | | SCAC4 |
| 5390 | DTTW | DOUBLE-TIME TRANSPORT LLC | | | SCAC4 |
| 5391 | DTTX | TTX Co. | added 1/1992; 1/1994-7/2005 | | NAKINA |
| 5392 | DTTX | Trailer Train Co. | added 1/1985; eliminated 1/1992 | | NAKINA |
| 5393 | DTTX | Trailer Train Co./TTX Co. (well-type COFC cars, capable of carrying double-stacked containers) | added 1/1985; 7/1985-1/1994 | | NAKINA |
| 5394 | DTTX | TTX Co. (well-type cars, capable of carrying double-stacked containers, and in some cases trailers) | 7/2000 | | NAKINA |
| 5395 | DTTX | Trailer Train Co. | added 1/85; eliminated 1/92 | | NRHS |
| 5396 | DTTX | TTX Co. | added 1/92 | | NRHS |
| 5397 | DTTX | TTX Co. (well-type COFC cars, capable of carrying double-stacked containers) | Jan-94 | | NRHS |
| 5398 | DTTX | TTX Co. (well-type cars, capable of carrying double-stacked containers, and in some cases trailers) | Jul-00 | | NRHS |
| 5399 | DTTX | TTX COMPANY | | | PWRC |
| 5400 | DTTX | Trailer Train (TTX Corporation) | | | RSRV |
