| Daallo Airlines | D3 | DAO | 991 |
| DAC Air SA | 6P | GCP | 779 |
| Dacono Air | DCA | ||
| Dakota National Air | |||
| Dalavia | H8 | KHB | 560 |
| Danish Air Transport | DX | DTR | |
| DAS Air Cargo | WD | DSR | 761 |
| Dasab Airlines | DSQ | ||
| dba | DI | BAG | 944 |
| Debonair Airways | 2G | DEB | |
| Deccan | DN | DKN | |
| Deer Jet | DF | DER | 898 |
| Delta Air Lines | DL | DAL | 006 |
| Demavia Airlines | EO | ALX | 663 |
| Denim Air | 3D | DNM | 490 |
| Deraya Air Service | DRY | ||
| Des R. Cargo Express | DRX | ||
| DHL Aero Express | D5 | DAE | 992 |
| DHL Air | D0 | DHK | |
| DHL Aviation | DHV | ||
| DHL de Guatemala | L3 | JOS | 947 |
| DHL/SNAS | ES | DHX | 155 |
| Diamond Sakha Airlines | D8 | DSL | 213 |
| Digex Aero Cargo | DGX | ||
| Dili Express Airlines | |||
| Dinar Lineas Aereas | D7 | RDN | 429 |
| Direct Air Charter | |||
| Directflyg | HS | HSV | |
| Dirgantara Air Service | AW | DIR | |
| Djibouti Airlines | D8 | DJB | |
| Dnepr-air | DNE | ||
| Dniproavia Joint Stock Aviation Company | Z6 | UDN | 181 |
| Dobrolet Airlines of Moscow | DOB | ||
| Dodita Air Cargo | |||
| Dodson International Air | |||
| Dominicana de Aviacion | DO | DOA | 113 |
| Domodedovo Airlines | E3 | DMO | 497 |
| Donbass Airlines | 5D | UDD | 945 |
| Donbassaero | 7D | UDC | 897 |
| Dragonair | KA | HDA | 043 |
| Druk Air | KB | DRK | 787 |
| Dutch Caribbean Airlines | K8 | DCE | 559 |
| Dvin Avia | DVN |