A B C D E F G H I J K L M N O P Q R S T U V W X Y Z

...CCentre (preceded by runway designation number to identify a parallel runway)
CDegrees Celsius (Centigrade)
CAACivil Aviation Authority
CACCircling Approach Chart
CATCategory
CATClear air turbulence
CAVOKVisibility, cloud and present weather better than prescribed values or conditions
CBCumulonimbus
CCCirrocumulus
CDRConditional route
CDNCoordination (message type designator)
CFMUCentral Flow Management Unit
CHChannel
CHGModification (message type designator)
CICirrus
CIDINCommon ICAO Data Interchange Network
CITNear or over large town
CIVCivil
CKCheck
CLCentre line
CLAClear type of ice formation
CLBRCalibration
CLDCloud
CLRClear or cleared to ... or clearance
CLSDClose or closed or closing
CMCentimetre
CMBClimb to or climbing to
CMPLCompletion or completed or complete
CNLCancel or cancelled
CNLFlight plan cancellation (message type designator)
CNSCommunications, navigation and surveillance
COMCommunications
CONCConcrete
CONDCondition
CONSContinuous
CONSTConstruction or constructed
CONTContinue or continued
COORCo−ordinate or co−ordination
COPChange−over point
CORCorrect or corrected or correction (used to indicie corrected meteorological message
COVCover or covered or covering
CPDLCController−pilot data link communications
CPLCurrent flight plan (message type designator)
CRAMConditional route availability message
CRZCruise
CSCall sign
CSCirrostratus
CTAControl area
CTCContact
CTLControl
CTNCaution
CTRControl zone
CUCumulus
CUFCumuliform
CUSTCustoms
CVRCockpit voice recorder
CVSMConventional vertical separation minimum
CWYClearway
(C) 2012-18 Jan Hrkal