| 1 | DZ | Transcaraibes Air International | ICAO: NOE, Callsign: French Hopper, Designator DZ* recalled by IATA | F | AVCODES |
| 2 | DZ | DHL Airways, Inc. | ICAO: DHL, Callsign: Dahl, | USA | AVCODES |
| 3 | DZ | Douglas Airways Pty., Ltd. | ICAO: DND, Callsign: Delta Zulu, | PNG | AVCODES |
| 4 | DZ | JSC Starline.kz | ICAO: LMZ, Callsign: Alunk, | KZ | AVCODES |
| 5 | DZ | Donghai Airlines Co., Ltd. | ICAO: EPA, Callsign: Donghai Air, IATA Prefix: 893, Designator J5* recalled by IATA | PRC | AVCODES |
| 6 | DZAQ | DE ANZA EXPRESS, INC | | | SCAC1 |
| 7 | DZAQ | DE ANZA EXPRESS | | | SCAC4 |
| 8 | DZBT | DOMINGUEZ, SAUL | | | SCAC4 |
| 9 | DZCT | DIAZ, CHARLES TRUCKING INC | | | SCAC4 |
| 10 | DZCX | American Steel & Wire Co. | 8/1920-7/1923 | | NAKINA |
| 11 | DZCX | AMERICAN STEEL & WIRE CO. | | | PWRC |
| 12 | DZD | Detskie Zeleznie Dorogi - Children's Railways | Common category for different children's railways in the Sovietunion. | SU | TRAFFIC |
| 13 | DZDL | DIAZ DE LEON HERRERA, EMMA LEONOR | | | SCAC4 |
| 14 | DZEA | DENIZ ENDUSTRISI A S | | | SCAC4 |
| 15 | DZEE | DAZEE TRANSPORTATION INC | | | SCAC4 |
| 16 | DZEN | DANUTTZ EXPRESS INC | | | SCAC4 |
| 17 | DZES | DEPLAZES TRUCKING | | | SCAC4 |
| 18 | DZET | DIAZ, ERNEST TRUCKING INC | | | SCAC4 |
| 19 | DZF | Dampfzugfreunde Landshut-Rottenburg e.V. | Landshut | D | privat-bahn.de |
| 20 | DZIE | Sudecka Komunikacja Autobusowa, sp. z o.o. | City: Dzierzoniów | PL | TRAFFIC |
| 21 | DZK | OZ Detská železnica Košice | City: Kosice | SK | TRAFFIC |
| 22 | DZLK | DALZIEL TRUCKING | | | SCAC4 |
| 23 | DZLMV | DHL Food Services GmbH | | DE | VKM |
| 24 | DZLU | TORINO GRAZYNA NYCZ | | PL | BIC |
| 25 | DZNA | DANZAS CORPORATION | | | SCAC4 |
| 26 | DZR | Midwest Aviation | Callsign: Dozer, | USA | AVCODES |
| 27 | DZSA | DIAZ SALGADO, MIGUEL IGNACIO | | | SCAC4 |
| 28 | DZST | DAZZOS SPECIALIZED TRANSPORTATION I | | | SCAC4 |
| 29 | DZSY | DRYZONE SYSTEMS INC | | | SCAC4 |
| 30 | DZTG | DURAZOS TRUCKING | | | SCAC4 |
| 31 | DZTK | DIZ TRUCKING, INC | | | SCAC1 |
| 32 | DZTK | DIZ TRUCKING INC | | | SCAC4 |
| 33 | DZUL | DIAZ GARCIA, PATRICIA | | | SCAC4 |
| 34 | DZW | Dampfziegelei Weißwasser | | D | TRAFFIC |
| 35 | DZWA | DIETZ & WATSON INC | | | SCAC4 |
| 36 | DZXI | DOZIER TRANSPORT INC | | | SCAC4 |
