| D... | Danger area (followed by identification) |
| D | Downward (tendency in RVR during previous 10minutes) |
| D | Self−briefing display |
| DA | Decision altitude |
| DCKG | Docking |
| DCT | Direct (in relation to flight plan clearances and type of approach) |
| DEC | December |
| DEG | Degrees |
| DEP | Depart or departure |
| DEP | Departure (message type designator) |
| DES | Descend to or descending to ... |
| DEST | Destination |
| DETRESFA | Distress phase |
| DEV | Deviation or deviating |
| DFDR | Digital flight data recorder |
| DFTI | Distance from touchdown indicator |
| DH | Decision height |
| DIF | Diffuse |
| DIST | Distance |
| DIV | Divert or diverting |
| DLA | Delay (message type designator) |
| DLA | Delay or delayed |
| DLSData | link service |
| DLY | Daily |
| DME | Distance measuring equipment |
| DNG | Danger or dangerous |
| DOM | Domestic |
| DP | Dew point temperature |
| DPT | Depth |
| DR | Dead reckoning |
| DR... | Low drifting ( followed by DU=dust, SA=sand or SN=snow) |
| DRG | During |
| DS | Duststorm |
| DTG | Date−time group |
| DTRT | Deteriorate or deteriorating |
| DU | Dust |
| DUR | Duration |
| DVOR | Doppler VOR |
| DZ | Drizzle |