Approach lighting system
ALT Altitude
ALTN Alternate aerodrome
AMD Amend or amended
AMDT Amendment
AMS Aeronautical mobile service
AMSL Above mean sea level
ANM AFTM Notification Message
AOC Aerodrome obstacle chart
APAPI Abbreviated Precision Approach Path Indicator
APCH Approach
APP Approach control office or approach control
APR April
APRX Approximate or approximately
ARFOR Area forecast (in aeronautical meteorological code)
ARMET Forecast upper wind and temperature at specified points (in aeronautical meteorological code)
ARP Aerodrome reference point
ARR Arrive or arrival
ARR Arrival message
ARS Special air-report (message type designator)
AS Altostratus
ASC Ascent to or ascending to
ASDA Accelerate stop distance available
A-SMR Advanced Surface Movement Radar
ASPH Asphalt
ASR Airport surveillance radar
ATA Actual time of arrival
ATC Air traffic control
ATD Actual time of departure
ATFM Air Traffic Flow Management
ATIS Automatic Terminal Information Service
ATMC Airspace and traffic management centre
ATS Air traffic service
ATTN Attention
ATZ Aerodrome traffic zone
AUG August
AUW All up weight
AVBL Available
AVGAS Aviation gasoline
AWY Airway
AZ Azimuth station
AZM Azimuth
B
B Blue
BA Braking action
BASE Cloud base
BCFG Fog patches
BCN Beacon (aeronautical ground light)
BCST Broadcast
BDRY Boundary
BECMG Becoming
BKN Broken
BLDG Building
BLO Below clouds
BLSN Blowing snow
BLW Below …
BR Mist
BRG Bearing
BRKG Braking
BS Commercial broadcasting station
BTL Between layers
BTN Between
C
C Centre (Runway identification)
C Degrees Celsius (Centigrade)
CAT Category
CAT Clear air turbulance
CAVOK Visibility, cloud and present weather better than prescribed values or conditions (in Europe: visibility more than 10 km, no clouds below 5000 ft, no precipitation, no cb, no drifting snow, no sandstorm
CB Cumulonimbus
CC Cirrocumulus
CD Candela
CEST Central European Summertime
CET Central European Time
CEU-W Central Executive Unit West
CFM Confirm or I confirm
CH Channel
CHG Modification message
CI Cirrus
CIV Civil
CLR Clear or cleared to or clearance
CLSD Closed
Cm Centimetre(s)
CMPL Completion or completed or complete
CNL Cancel or cancelled
CNL Flight plan cancellation message
COM Communications
CON CONSOL
CONC Concrete
COND Condition
CONST Construction or constructed
CONT Continue or continued
COORD Corrdinates
COP Change-over point
COR Correct or corrected or correction
COV Cover or covered or covering
CPL Current flight plan message
CRAM Conditional routes available message
CS Call sign
CS Cirrostratus
CTA Control area
CTL
