Skratky a kódy, potrebné na dekódovanie a kódovanie dokumentov, ktoré sú plne v súlade s ICAO (International Civil Aviation Organization) – Dokument 8400 „Skratky a kódy“.
| Skratka / značka | Význam skratky / značky |
| … C | Centre (preceded by runway designation number to identify a parallel runway) |
| C | Degrees Celsius (Centigrade) |
| CAT | Category |
| CAT | Clear air turbulence |
| CAVOK | Visibility, cloud and present weather better than prescribed values or conditions |
| CB | Cumulonimbus |
| CC | Cirrocumulus |
| CCA | (or CCB, CCC. .. etc., in sequence) Corrected meteorological message |
| CD | Candela |
| CDN | Coordination (message type designator) |
| CF | Change frequency to . . . |
| CFM | Confirm or I confirm |
| CGL | Circling guidance light(s) |
| CH | Channel |
| CHG | Modification (message type designator) |
| CI | Cirrus |
| CIT | Near or over large towns |
| CIV | Civil |
| CK | Check |
| CL | Centre line |
| CLA | Clear type of ice formation |
| CLBR | Calibration |
| CLD | Cloud |
| CLG | Calling |
| CLIMB-OUT | Climb-out area |
| CLR | Clear(s) or cleared to . . . or clearance |
| CLRD | Runway(s) cleared (used in METAR/SPECI) |
| CLSD | Close or closed or closing |
| CM | Centimetre |
| CMB | Climb to or climbing to |
| CMPL | Completion or completed or complete |
| CNL | Cancel or cancelled |
| CNL | Flight plan cancellation |
| CNS | Communications, navigation and surveillance |
| COM | Communications |
| CONC | Concrete |
| COND | Condition |
| CONS | Continuous |
| CONST | Construction or constructed |
| CONT | Continue(s) or continued |
| COOR | Coordinate or coordination |
| COORD | Coordinates |
| COP | Change-over point |
| COR | Correct or correction or corrected |
| COT | At the coast |
| COV | Cover or covered or covering |
| CPDLC | Controller-pilot data link communications |
| CPL | Current flight plan |
| CRC | Cyclic redundancy check |
| CRZ | Cruise |
| CS | Call sign |
| CS | Cirrostratus |
| CTA | Control area |
| CTAM | Climb to and maintain |
| CTC | Contact |
| CTL | Control |
| CTN | Caution |
| CTR | Control zone |
| CU | Cumulus |
| CUF | Cumuliform |
| CVR | Cockpit voice recorder |
| CW | Continuous wave |
| CWY | Clearway |
| D | Downward (tendency in RVR during previous 10 minutes) |
| D .. . | Danger area (followed by identification) |
| DA | Decision altitude |
| D-ATIS | Data link automatic terminal information service |
| DCKG | Docking |
| DCP | Datum crossing point |
| DCPC | Direct controller-pilot communications |
| DCT | Direct (in relation to flight plan clearances and type of approach) |
| DEC | December |
| DEC | Degrees |
| DEP | Depart or departure |
| DEP | Departure |
| 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 |
| DIP | Diffuse |
| DIST | Distance |
| DIV | Divert or diverting |
| DLA | Delay or delayed |
| 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 |
| DTAM | Descend to and maintain |
| DTG | Date-time group |
| DTHR | Displaced runway threshold |
| DTRT | Deteriorate or deteriorating |
| DTW | Dual tandem wheels |
| DU | Dust |
| DUC | Dense upper cloud |
| DUPE | This is a duplicate message |
| DUR | Duration |
| D-VOLMET | Data link VOLMET |
| DVOR | Doppler VOR |
| DW | Dual wheels |
| DZ | Drizzle |