Acronyms
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D
| Acronym | Meaning | Source |
| D | Deleted | AIS |
| D | Downward (tendency in RVR (Runway visual range) during previous 10 minutes) | ICAO |
| D-ATIS | Data Link Automatic Terminal Information Service (pronounced'DEE-ATIS') | |
| D-VOLMET | Data Link VOLMET | |
| D... | Danger Area (followed by identification) | AIS |
| DA | Decision Altitude | AIS |
| DA/H | Decision Altitude/Height | AIP |
| DALR | Dry Adiabatic Lapse Rate | |
| DAME | Designated Aviation Medical Examiner | CASR Part 67 |
| DAO | Designated Aviation Ophthamologist | CASR Part 67 |
| DAP | Departure and Approach Procedures | AIP |
| DCA | Department of Civil Aviation (previous to CASA) | |
| DCD | Double channel duplex | ICAO |
| DCKG | Docking | AIS |
| DCMSD | Decommissioned | AIS |
| DCPC | Direct Controller-Pilot Communications | AIS |
| DCS | Double channel simplex | ICAO |
| DCT | Direct (in relation to flight plan clearances and type of approach) | AIS |
| DE | Form (used to preceed the call sign of the calling station) (to be used in AFS as a procedure signal) | ICAO/AIP |
| DEC | December | AIS |
| DEG | Degrees | AIS |
| DEP | Depart, Departure, Departed, Departing, Departure Message | AIS |
| DER | Departure End of Runway | AIP |
| DER | Designated Engineering Representative | FAR |
| DES | Descend to, Descending to | AIS |
| DEST | Destination | AIS |
| DETRESFA | Distress Phase | AIS |
| DEV | Deviation, Deviating | AIS |
| DF | Direction Finder/ Finding | AIS |
| DFDR | Digital Flight Data Recorder | AIS |
| DFTI | Distance from touchdown indicator | ICAO |
| DGA | Distance Measuring Equipment or Global Positioning Satellite System Arrival | |
| DH | Decision Height | ICAO |
| DIF | Diffuse | AIS |
| DISP | Displaced | AIS |
| DIST | Distance | AIS |
| DITRDLG | Department of Infrastructure, Transport, Regional Development and Local Government (formerly DOTARS) | |
| DIV | Diversion, Divert, Diverting | AIS |
| DLA | Delay (message type designator) | ICAO/AIP |
| DLIC | Data Link Initiation Capability | AIS |
| DLY | Daily | AIS |
| DMC | Direct Maintenance Cost | WATOG |
| DME | Distance Measuring Equipment | ICAO/AIP |
| DMEN | DME (International) | AIS |
| DMEP | DME (International Precision used in conjunction with Microwave Landing System) | AIS |
| DNG | Danger, Dangerous | AIS |
| DOC | Direct Operating Cost | WATOG |
| DOC | Documents | AIS |
| DoD | Department of Defence | |
| DOM | Domestic | AIS |
| DP | Dew Point Temperature | ICAO/AIP |
| DP | Discussion Paper | CASA |
| DPT | Depth | AIS |
| DR | Dead Reckoning (navigation) | ICAO |
| DR... | Low drifting (followed by DU=dust, SA=sand or SN=snow) | AIS |
| DRG | During | AIS |
| DS | Dust storm | AIS |
| DSB | Double sideband | ICAO |
| DTAM | Descend to And Maintain | AIS |
| DTG | Date-Time Group | AIS |
| DTHR | Displaced Runway Threshold | AIS |
| DTRT | Deteriorate, Deteriorating | AIS |
| DTW | Dual tandem wheels | ICAO |
| DU | Dust | AIS |
| DUC | Dense Upper Cloud (met) | AIS |
| DUPE | This is a duplicate message (to be used in Aeronautical Fixed Service as a procedure signal) | ICAO |
| DUR | Duration | AIS |
| DVOR | Doppler VOR | AIS |
| DW | Dual wheels | ICAO |
| DZ | Drizzle | AIS |