| ICAO | IATA | NAME |
|---|
| DDA | | D & D Aviation |
| DNK | | D&K Aviation |
| DAO | D3 | Daallo Airlines |
| DAG | N2 | Dagestan Airlines |
| DHA | | Dahla Airlines |
| DCS | | Daimler Chrysler Aviation |
| DCX | | Daimler-Chrysler |
| DKA | | Daka |
| DLR | | Dala Air Services |
| KHB | H8 | Dalavia |
| DXP | | Dallas Express Airlines |
| DAS | | Damascene Airways |
| DSA | | Danbury Airways |
| DOP | | Dancopter |
| DAF | | Danish Air Force |
| DAR | | Danish Army |
| DNY | | Danish Navy |
| DNU | | Danu Oro Transportas |
| DHE | | DAP Helicopteros |
| DRT | | Darta |
| DWT | 0D | Darwin Airline |
| DSR | WD | DAS Air Cargo |
| RKC | | DAS Airlines |
| DSQ | | Dasab Airlines |
| DSH | | Dash Air Charter |
| GOB | | Dash Aviation |
| DGX | | Dasnair |
| DAB | | Dassault Aviation |
| CVF | | Dassault Falcon Jet Corporation |
| DSO | | Dassault Falcon Service |
| DTR | DX | DAT Danish Air Transport |
| ENT | | DAT Enterprise Limited |
| DTN | | Data International |
| XDT | | Date Transformation Corp |
| DAU | D5 | Dauair |
| DCO | | David Crawshaw Consultants Limited |
| DWN | | Dawn Air |
| DAY | | Daya Aviation |
| DJS | | DayJet |
| BAG | DI | dba |
| DHC | | De Havilland |
| IAY | | Deadalos Flugtbetriebs |
| DAA | | Decatur Aviation |
| DKN | | Deccan Aviation |
| DLK | | Deccan Aviation (Lanka) |
| DER | | Deer Jet |
| JDC | | Deere and Company |
| DWR | | Delaware Skyways |
| DEA | | Delta Aerotaxi |
| SNO | | Delta Air Charter |
| ELJ | | Delta Air Elite |
| DAL | DL | Delta Air Lines |
| KMB | | Delta Engineering Aviation |
| DLI | | Delta Express International |
| DSU | | Delta State University |
| DNM | | Denim Air |
| FEC | | Denver Express |
| DJT | | Denver Jet |
| FGC | | Departmento De Agricultura De La Generalitat De Ca |
| BDN | | DERA Boscombe Down |
| DRY | | Deraya Air Taxi |
| DRX | | Des R Cargo Express |
| MIZ | | Desarrollo Milaz |
| DSN | | DESNA |
| DTY | | Destiny Air Services |
| DET | | DETA Air |
| 2A | Deutsche Bahn |
| AMB | 1I | Deutsche Rettungsflugwacht |
| LFO | | Deutsches Zentrum fur Luft-und Raumfahrt EV |
| VLF | | DFS UK Limited |
| DGO | | DGO Jet |
| DAE | | DHL Aero Expreso |
| DHK | | DHL Air |
| DHV | | DHL Aviation |
| JOS | L3 | DHL de Guatemala |
| DHX | ES | DHL International |
| DIS | | Di Air |
| SPK | | Diamond Aviation |
| DRB | | Didier Rousset Buy |
| DGT | | Digital Equipment Corporation |
| RDN | D7 | Dinar |
| DIP | | Diplomatic Freight Services |
| ENA | | Direccion General de Aviacion Civil y Telecomunica |
| DIA | | Direct Air |
| DCT | | Direct Flight |
| DIR | AW | Dirgantara Air Service |
| DCV | | Discover Air |
| DVA | DH | Discovery Airways |
| XDS | | Dispatch Services |
| DIX | | Dix Aviation |
| DEE | | Dixie Airways |
| DJB | D8 | Djibouti Airlines |
| GPL | | DLR |
| UDN | | Dniproavia |
| IXX | | Dolphin Express Airlines |
| DPL | | Dome Petroleum |
| MYO | | Dominguez Toledo (Grupo Mayoral) |
| DOA | DO | Dominicana de Aviación |
| DMO | E3 | Domodedovo Airlines |
| DVB | | Don Avia |
| DON | | Donair Flying Club |
| UDC | 5D | DonbassAero |
| DAD | | Dorado Air |
| DOR | | Dornier |
| DAV | | Dornier Aviation Nigeria |
| DOM | | Dos Mundos |
| HDA | KA | Dragonair, Hong Kong Dragon Airlines |
| DCA | | Dreamcatcher Airways |
| DRK | KB | Druk Air |
| DRE | | Drummond Island Air |
| RSK | | DSWA |
| DUB | | Dubai Airwing |
| DBK | | Dubrovnik Air |
| DUK | | Ducair |
| DBJ | | Duchess of Britany (Jersey) Limited |
| PHD | | Duncan Aviation |
| VVF | | Dunyaya Bakis Hava Tasimaciligi |
| DUO | | Duo Airways |
| DJE | | Durango Jet |
| DNL | | Dutch Antilles Express |
| DCE | | Dutch Caribbean Express |
| DBR | | Dutchbird |
| DFS | | Dwyer Aircraft Services |
| XDY | | Dynair Services |
| DNR | | Dynamair Aviation |
| DYE | | Dynamic Air |
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