| 1 | DTR | Danish Air Transport | IATA: DX, Callsign: Danish, Designator DX* reinstated by IATA | DK | AVCODES |
| 2 | DTR | DAT Danish Air Transport | IATA: DX | | ICAO1 |
| 3 | DTR | DORI TRANS SRL | | RO | VKM |
| 4 | DTRA | DACHSER TRANSPORT | | | SCAC4 |
| 5 | DTRC | DELTA TRANSPORT INC | | | SCAC4 |
| 6 | DTRD | DISCIPLE TRUCKING | | | SCAC4 |
| 7 | DTRE | DISTRIBUIDORA DE REFACCIONES DEL GO | | | SCAC4 |
| 8 | DTRF | DRF TRUCKING | | | SCAC4 |
| 9 | DTRG | D-TRANS LOGISTICS | | | SCAC4 |
| 10 | DTRH | DAINS TRUCKING | | | SCAC4 |
| 11 | DTRI | DISTANCE TRANSPORT INC | | | SCAC4 |
| 12 | DTRJ | DENNY TRUCKING | | | SCAC4 |
| 13 | DTRO | D T R TRUCKING | | | SCAC4 |
| 14 | DTRP | DENNYS TRANSPORT | | | SCAC4 |
| 15 | DTRQ | DIANA TRANSPORT | | | SCAC4 |
| 16 | DTRR | Danbury Terminal Rail Road Co., Inc. | 7/2005 | | NAKINA |
| 17 | DTRR | Danbury Terminal R.R. Co. | 7/2000 | | NAKINA |
| 18 | DTRR | Housatonic R.R. Co., Inc. | added 7/1997; eliminated 10/1997 | | NAKINA |
| 19 | DTRR | Danbury Terminal R.R. Co. | added 4/1993; 1/1994; eliminated 7/1997 | | NAKINA |
| 20 | DTRR | Danbury Terminal R.R. Co. | added 4/93; 1/94; eliminated 7/97 | | NRHS |
| 21 | DTRR | Housatonic R.R. Co., Inc. | added 7/97; eliminated 10/97 | | NRHS |
| 22 | DTRR | Danbury Terminal R.R. Co. | Jul-00 | | NRHS |
| 23 | DTRR | HOUSATONIC RAIL ROAD CO. [DANBURY TERMINAL RAILROAD CO.] | | | PWRC |
| 24 | DTRR | Danbury Terminal Railroad (Housatonic Railroad) | | | RSRV |
| 25 | 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 |
| 26 | DTRU | DLTK LTD | | RUS | BIC |
| 27 | DTRV | DAVEY'S TRUCKING | | | SCAC4 |
| 28 | DTRW | DONTRANS INC | | | SCAC4 |
| 29 | DTRY | DANIEL TRUCKING | | | SCAC4 |
