|
Definition
|
Contraction
|
Usage
|
|
1
or 2 octas (eighths) cloud coverage
|
FEW
|
METAR
|
|
abandon
|
ABND
|
GEN
|
|
abbreviate
|
ABBR
|
GEN
|
|
Abbreviated
precision approach path indicator
|
APAPI
|
ICAO
|
|
Abbreviated
T visual approach slope indicator system
|
ATVASIS
|
ICAO
|
|
abeam
|
ABM
|
GEN
|
|
abnormal
|
ABNML
|
GEN
|
|
aboard
|
ABD
|
GEN
|
|
about
|
ABT
|
GEN
|
|
above
|
ABV
|
ICAO
|
|
above
aerodrome level
|
AAL
|
ICAO
|
|
above
clouds
|
ACLD
|
GEN
|
|
above
ground level
|
AGL
|
ICAO
|
|
above
mean sea level
|
AMSL
|
GEN
|
|
above
mountains
|
MON
|
ICAO
|
|
above
sea level
|
ASL
|
GEN
|
|
above
transmitted as received
|
ATAR
|
GEN
|
|
absolute
(temperature)
|
A
|
NWS
|
|
abundant
|
ABNDT
|
GEN
|
|
accelerate
|
ACLT
|
GEN
|
|
acceleratestop distance
available
|
ASDA
|
GEN
|
|
accept
|
ACPT
|
GEN
|
|
acceptance
(message type designator)
|
ACP
|
ICAO
|
|
access
|
ACES
|
GEN
|
|
accident
|
ACDNT
|
GEN
|
|
accident
notice
|
ACNOT
|
GEN
|
|
accompany
|
ACPY
|
GEN
|
|
account
|
ACCT
|
GEN
|
|
account
mechanical
|
AMECH
|
GEN
|
|
account
traffic
|
ATFC
|
GEN
|
|
account
weather
|
AWX
|
GEN
|
|
accumulate
|
ACCUM
|
GEN
|
|
acknowledge
|
ACK
|
GEN
|
|
acknowledgement
of receipt (message handling)
|
R
|
GEN
|
|
acrobatic
|
ACRBT
|
ATC
|
|
across
|
ACRS
|
GEN
|
|
acting
|
ACTG
|
GEN
|
|
activate
|
ACTVT
|
GEN
|
|
activate
IFR flight plan
|
AIFP
|
ATC
|
|
activate
VFR flight plan
|
AVFP
|
ATC
|
|
active
|
ACTV
|
GEN
|
|
active
or activated or activity
|
ACT
|
ICAO
|
|
actual
time of arrival
|
ATA
|
ATC
|
|
actual
time of departure
|
ATD
|
ATC
|
|
actual
time of penetration
|
ATP
|
ATC
|
|
actual
time of release
|
ATRLS
|
ATC
|
|
actual
wind factor
|
ALWF
|
NWS
|
|
addition
|
ADDN
|
GEN
|
|
additional
traffic is
|
ADNL
TFC
|
ATC
|
|
address
|
ADS
|
GEN
|
|
adequate
|
ADQT
|
GEN
|
|
adirondack
|
ADRNDCK
|
NWS
|
|
adjacent
|
ADJ
|
ICAO
|
|
administration
|
ADMIN
|
GEN
|
|
administrative
|
ADMIV
|
GEN
|
|
administrator
|
ADMIR
|
GEN
|
|
advance
|
ADVN
|
GEN
|
|
Advance
boundary information
|
ABI
|
ICAO
|
|
Advanced
Navigation Routes
|
ANR
|
ATC
|
|
advection
|
ADVCTN
|
NWS
|
|
advice
|
ADVC
|
GEN
|
|
advise
|
ADV
|
NWS
|
|
advise
|
ADZ
|
GEN
|
|
advise
arrival
|
ADZAR
|
ATC
|
|
advise
at what time able
|
AAWTA
|
ICAO
|
|
advise
by air mail as soon as possible
|
ADMAP
|
GEN
|
|
advise
customs
|
ADCUS
|
GEN
|
|
advise
disposition
|
ADSPN
|
GEN
|
|
advise
if able
|
AIA
|
ATC
|
|
advise
if able to proceed
|
AAP
|
ATC
|
|
advise
if not correct
|
ADNOK
|
ATC
|
|
advise
intentions
|
ADZI
|
ATC
|
|
advise
or issue instructions to all concerned
|
ADCON
|
GEN
|
|
advise
present position and altitude
|
APPA
|
ATC
|
|
advise
reason for delay
|
ADRDE
|
ATC
|
|
advise
this office
|
ADZOF
|
GEN
|
|
advise
when able
|
AWA
|
ATC
|
|
advise
when established
|
AWE
|
ATC
|
|
advisory
|
ADVY
|
NWS
|
|
advisory
|
ADZY
|
GEN
|
|
advisory
|
ADZY
|
ATC
|
|
advisory
|
ADVZY
|
ATC
|
|
advisory
area
|
ADA
|
ATC
|
|
Advisory
Circular
|
AC
|
GEN
|
|
advisory
route
|
ADR
|
ATC
|
|
aerial
|
ARL
|
ATC
|
|
aerodrome
|
AD
|
ICAO
|
|
aerodrome
beacon
|
ABN
|
ICAO
|
|
Aerodrome
chart
|
ADC
|
ICAO
|
|
aerodrome
control tower
|
TWR
|
ICAO
|
|
aerodrome
flight information service
|
AFIS
|
ICAO
|
|
aerodrome
forecast
|
TAF
|
ICAO
|
|
aerodrome
obstacle chart (followed by type & name/title)
|
AOC
|
ICAO
|
|
Aerodrome
office (specify service)
|
ADO
|
ICAO
|
|
aerodrome
reference point
|
ARP
|
ICAO
|
|
aerodrome
traffic zone
|
ATZ
|
ICAO
|
|
aerodromes,
air routes and ground aids
|
AGA
|
ICAO
|
|
aeronautical
|
AERO
|
GEN
|
|
Aeronautical
chart 1:500 000 (followed by name/title)
|
ANC
|
ICAO
|
|
aeronautical
fixed service
|
AFS
|
GEN
|
|
Aeronautical
Fixed Telecommunications Network
|
AFTN
|
GEN
|
|
Aeronautical
Information Circular
|
AIC
|
GEN
|
|
Aeronautical
Information Publication
|
AIP
|
ATC
|
|
aeronautical
information publications (In General)
|
AIP
|
GEN
|
|
aeronautical
information regulation and control
|
AIRAC
|
GEN
|
|
aeronautical
information service
|
AIS
|
GEN
|
|
aeronautical
information specialist
|
AIS
|
GEN
|
|
aeronautical
maps and charts
|
MAP
|
ICAO
|
|
aeronautical
mobile satellite service
|
AMSS
|
ICAO
|
|
aeronautical
mobile service
|
AMS
|
GEN
|
|
Aeronautical
navigation chart small scale (followed by name/title scale)
|
ANCS
|
ICAO
|
|
Aeronautical
Radio, Incorporated
|
ARINC
|
GEN
|
|
Aeronautical
Telecommunications Network
|
ATN
|
ICAO
|
|
aeronautical
telecommunications operator
|
ATO
|
GEN
|
|
affect
|
AFCT
|
GEN
|
|
affirmative
|
AFIRM
|
GEN
|
|
affirmative
|
AFM
|
ICAO
|
|
After
|
AFT
|
GEN
|
|
after
dark
|
AFDK
|
NWS
|
|
after
passing
|
APSG
|
ICAO
|
|
Afternoon
|
AFTN
|
GEN
|
|
Again
|
AGN
|
GEN
|
|
Aggregate
demand list
|
ADL
|
ATC
|
|
Agree
|
AGR
|
GEN
|
|
agreement
|
AGRMT
|
GEN
|
|
Ahead
|
AHD
|
GEN
|
|
air
carrier
|
ACR
|
GEN
|
|
Air
Carrier District Office
|
ACDO
|
GEN
|
|
air
combat maneuvers
|
ACM
|
ATC
|
|
air
combat training
|
ACT
|
ATC
|
|
Air
Defense Control Facility
|
ADCF
|
GEN
|
|
Air
Defense Emergency
|
ADE
|
GEN
|
|
air
defense identification zone
|
ADIZ
|
GEN
|
|
Air
Defense Liaison Officer
|
ADLO
|
GEN
|
|
Air
Defense Sector
|
ADS
|
GEN
|
|
air
defense warning
|
ADW
|
GEN
|
|
air
evacuation
|
AEVAC
|
ATC
|
|
air
express
|
AXPS
|
GEN
|
|
Air
Force Base
|
AFB
|
GEN
|
|
Air
Force Communications Network
|
AIRCOMNET
|
GEN
|
|
Air
Force Jet
|
AFJ
|
ATC
|
|
Air
Force NOTAM Exchange Area
|
AFNEA
|
GEN
|
|
Air
Force NOTAM Exchange Office
|
AFNEO
|
GEN
|
|
Air
Force overrun 1000ft standard approach lighting system
|
AFOVRN
|
MIL
|
|
Air
Force Representative to the FAA
|
AFREP
|
GEN
|
|
Air
Force Rescue Coordination Center
|
AFRCC
|
GEN
|
|
air
freight
|
AFRT
|
GEN
|
|
air
ground
|
AG
|
ATC
|
|
Air
Line Dispatchers Association
|
ALDA
|
GEN
|
|
Air
Line Pilots Association
|
ALPA
|
GEN
|
|
air
mass
|
AMS
|
NWS
|
|
Air
Mobility Command
|
AMC
|
ATC
|
|
Air
National Guard
|
ANG
|
GEN
|
|
air
navigation facility
|
ANF
|
GEN
|
|
air
navigation radio aids
|
ANRA
|
GEN
|
|
air
operations network
|
AIROPNET
|
GEN
|
|
air
refueling
|
AIRFL
|
ATC
|
|
air
refueling control point
|
ARCP
|
ATC
|
|
air
refueling egress point
|
AREP
|
ATC
|
|
air
refueling exit
|
AREX
|
ATC
|
|
air
refueling initial point
|
ARIP
|
ATC
|
|
air
report
|
AIREP
|
GEN
|
|
Air
Rescue Service (USAF)
|
ARS
|
GEN
|
|
Air
Reserve Base
|
ARB
|
GEN
|
|
air
route surveillance radar
|
ARSR
|
GEN
|
|
air
route traffic control
|
ARTC
|
GEN
|
|
Air
Route Traffic Control Center
|
ARTCC
|
GEN
|
|
air
to air
|
A/A
|
ATC
|
|
air
to ground
|
A/G
|
ATC
|
|
air
traffic control
|
ATC
|
ICAO
|
|
Air
Traffic Control Association
|
ATCA
|
GEN
|
|
air
traffic flow management
|
ATFM
|
ICAO
|
|
air
traffic management
|
ATM
|
ICAO
|
|
Air
Traffic Organization
|
ATO
|
GEN
|
|
air
traffic procedures
|
ATP
|
GEN
|
|
Air
Traffic Procedures Advisory Committee
|
ATPAC
|
GEN
|
|
air
traffic representative
|
ATREP
|
GEN
|
|
Air
Traffic Service Contingency Command Post
|
ATSCCP
|
GEN
|
|
Air
traffic services interfacility data
communication
|
AIDC
|
ICAO
|
|
air
traffic services reporting office
|
ARO
|
GEN
|
|
Air
Transport Association of America
|
ATA
|
GEN
|
|
air
transport pulse radar navigation aid
|
CPN
|
GEN
|
|
air
transport pulse radar search
|
CPS
|
GEN
|
|
air
transport rating
|
ATR
|
GEN
|
|
air
weather service (USAF)
|
AWS
|
GEN
|
|
airborne
|
AB
|
ATC
|
|
airborne
collision avoidance system
|
ACAS
|
ICAO
|
|
airborne
early warning
|
AEW
|
GEN
|
|
airborne
launching
|
ABLCHG
|
ATC
|
|
airborne
pulse search radar
|
APS
|
GEN
|
|
Airborne
Radar Unit
|
ARU
|
GEN
|
|
aircraft
|
ACFT
|
ICAO
|
|
aircraft
and engine mechanic
|
AEM
|
GEN
|
|
aircraft
classification number
|
ACN
|
ICAO
|
|
Aircraft
communication addressing & reporting system
|
ACARS
|
ICAO
|
|
aircraft
control and warning
|
ACW
|
GEN
|
|
aircraft
departing at (number of minutes) intervals
|
ADMIS
|
ATC
|
|
aircraft
earth station
|
AES
|
ICAO
|
|
aircraft
identification
|
ACID
|
ATC
|
|
aircraft
movement information services
|
AMIS
|
GEN
|
|
aircraft
out of commission for parts
|
AOCP
|
GEN
|
|
Aircraft
Owners and Pilots Association
|
AOPA
|
GEN
|
|
Aircraft
parking/docking chart (followed by name/title)
|
APDC
|
ICAO
|
|
aircraft
rescue and fire fighting
|
ARFF
|
ATC
|
|
airmail
|
ARML
|
GEN
|
|
Airman’s
Information Manual
|
AIM
|
GEN
|
|
Airmen’s
Meteorological Information
|
AIRMET
|
GEN
|
|
AIRMET
|
WA
|
NWS
|
|
airport
|
AP
|
ICAO
|
|
airport
|
ARPT
|
GEN
|
|
airport
acceptance rate
|
AARTE
|
ATC
|
|
airport
arrival rate
|
AAR
|
ATC
|
|
airport
departure rate
|
ADR
|
ATC
|
|
Airport
Development Aid Program
|
ADAP
|
GEN
|
|
Airport
District Office
|
ADO
|
GEN
|
|
airport
in sight
|
AIS
|
GEN
|
|
airport
information desk
|
AID
|
GEN
|
|
airport
layout plan
|
ALP
|
GEN
|
|
airport
lights
|
APL
|
GEN
|
|
airport
manager
|
AMGR
|
GEN
|
|
airport
of entry
|
AOE
|
GEN
|
|
airport
operating certificate
|
AOC
|
GEN
|
|
airport
radar service area
|
ARSA
|
ATC
|
|
airport
reference point
|
ARP
|
GEN
|
|
airport
rescue and fire fighting alarm checked
|
ARFFOK
|
ATC
|
|
airport
reservation position
|
ARP
|
GEN
|
|
Airport
Reservations Office
|
ARO
|
GEN
|
|
airport
surface detection equipment
|
ASDE
|
GEN
|
|
airport
surveillance radar
|
ASR
|
GEN
|
|
airport
system plan
|
ASP
|
GEN
|
|
Airport
Traffic Control Tower
|
ATCT
|
GEN
|
|
Airport/Facility
Directory
|
AFD
|
GEN
|
|
airports
program report
|
APR
|
GEN
|
|
airreport
|
ARP
|
GEN
|
|
Airspace
|
ASP
|
GEN
|
|
airspace
docket
|
ASD
|
GEN
|
|
airspace
flight inspection pilot
|
ASIP
|
GEN
|
|
Airspace
Reservation Unit (Canadian)
|
ARU
|
GEN
|
|
airway
|
AWY
|
GEN
|
|
airways
engineer
|
AENG
|
GEN
|
|
Alaskan
Air Command
|
AAC
|
GEN
|
|
Alaskan
Region, FAA
|
AAL
|
GEN
|
|
Alaskan
Standard Time (time groups only)
|
A
|
NWS
|
|
Alberta
|
ALTA
|
NWS
|
|
alert
notice
|
ALNOT
|
GEN
|
|
alert
phase code (alerting service)
|
ALERFA
|
ATC
|
|
alerting
|
ALR
|
ICAO
|
|
Aleutian
|
ALUTN
|
NWS
|
|
alighting
area
|
ALA
|
GEN
|
|
alignment
|
ALNMT
|
GEN
|
|
all
(when used as prefix)
|
AL
|
GEN
|
|
all
accident notice offices
|
ALANO
|
GEN
|
|
all
air carrier field offices
|
ALACFO
|
GEN
|
|
all
air defense liaison officers in service area
|
ALADLO
|
GEN
|
|
all
air route traffic control centers in service area
|
ALARTC
|
GEN
|
|
all
air traffic (area) supervisors in service area
|
ALATAS
|
GEN
|
|
all
air traffic field facilities
|
ALATF
|
GEN
|
|
all
air traffic field offices
|
ALATFO
|
GEN
|
|
all
air traffic service personnel in service area
|
ALAT
|
GEN
|
|
all
technical operations
|
ALAFFO
|
GEN
|
|
all
air traffic combined station/centers in service area
|
ALCS/C
|
GEN
|
|
all
air traffic combined station/towers in service area
|
ALCS/T
|
GEN
|
|
all
ATC towers in service area
|
ALTWR
|
GEN
|
|
all
concerned notified
|
ACN
|
GEN
|
|
all
FAA field offices and personnel
|
ALFAA
|
GEN
|
|
all
FAA offices on NADIN
|
ALFAB
|
GEN
|
|
all
flight service stations in service area
|
ALFSS
|
GEN
|
|
all
flight standards field offices
|
ALFSFO
|
GEN
|
|
all
international aeronautical telecommunication switching centers
|
ALIATSC
|
GEN
|
|
all
international air traffic switching centers
|
AIATSC
|
GEN
|
|
all
international field offices
|
ALIFO
|
GEN
|
|
all
international flight service stations in service area
|
ALIFSS
|
GEN
|
|
all
offices having sendreceive teletypewriter
service on circuit
|
ALCKT
|
GEN
|
|
all
quadrants
|
ALQDS
|
NWS
|
|
all
radar ATC facilities in service area
|
ALRAFAC
|
GEN
|
|
all
regional/service area offices
|
ALRGN
|
GEN
|
|
all
sectors
|
ALSEC
|
NWS
|
|
all
technical operations
|
ALAFFO
|
GEN
|
|
all
up weight (gross weight)
|
AUW
|
GEN
|
|
all
weather landing
|
AWL
|
ATC
|
|
Allegheny
|
ALGHNY
|
NWS
|
|
allotment
advice
|
ADVALT
|
GEN
|
|
allowable
takeoff gross weight
|
ATOG
|
GEN
|
|
aloft
|
ALF
|
NWS
|
|
along
|
ALG
|
GEN
|
|
already
had
|
A/H
|
ATC
|
|
alternate
|
ALTN
|
GEN
|
|
alternate
(aerodrome)
|
ALTN
|
ICAO
|
|
alternate
airport
|
ALTPT
|
GEN
|
|
alternate
departure route
|
ADRT
|
ATC
|
|
altimeter
|
ALTM
|
GEN
|
|
altimeter
check location
|
ACL
|
ATC
|
|
altimeter
setting
|
ALSTG
|
GEN
|
|
altimeter
setting indicator
|
ASI
|
GEN
|
|
altimeter
subscale setting to obtain elevation when on the ground
|
QNH
|
ICAO
|
|
Altimetry
system error
|
ASE
|
ICAO
|
|
altitude
|
ALT
|
ICAO
|
|
altitude
radial
|
ARAD
|
ATC
|
|
altitude
reservation
|
ALTRV
|
GEN
|
|
altitude
reservation void for aircraft not airborne by
|
AVANA
|
ATC
|
|
altocumulus
|
AC
|
NWS
|
|
altocumulus
castellanus
|
ACCAS
|
NWS
|
|
altostratus
|
AS
|
NWS
|
|
amber
|
A
|
GEN
|
|
ambiguity
|
AMB
|
GEN
|
|
amend
/ amended forecast
|
AMD
|
GEN/
|
|
amended
clearance
|
AMCL
|
ATC
|
|
amended
route of flight
|
AMRF
|
ATC
|
|
amendment
|
AMDT
|
GEN
|
|
American
Meteorological Society
|
AMS
|
NWS
|
|
American
Telephone and Telegraph Company
|
ATT
|
GEN
|
|
amount
|
AMT
|
GEN
|
|
amplifier
or amplify
|
AMP
|
GEN
|
|
amplitude
|
AMPLTD
|
NWS
|
|
analysis
|
ANLYS
|
NWS
|
|
announce
|
ANNC
|
GEN
|
|
annual
leave
|
AL
|
GEN
|
|
anomalous
propagation
|
AP
|
ATC
|
|
answer
|
ANS
|
GEN
|
|
ante
meridiem
|
AM
|
NWS
|
|
antenna
|
ANT
|
GEN
|
|
anticipate
|
ANCPT
|
GEN
|
|
anticyclonic
|
ACYC
|
NWS
|
|
Appalachian
|
APLCN
|
NWS
|
|
apparent
|
APRNT
|
GEN
|
|
appear
|
APPR
|
GEN
|
|
appoint
|
APNT
|
GEN
|
|
approach
|
APCH
|
ICAO
|
|
approach
and departure control
|
AADC
|
ATC
|
|
approach
control
|
A/C
|
ATC
|
|
approach
control or approach control office
|
APP
|
ICAO
|
|
approach
end runway
|
AER
|
GEN
|
|
approach
light lane
|
YL
|
ATC
|
|
approach
light system
|
ALS
|
ICAO
|
|
approach
path alignment panel
|
APAP
|
GEN
|
|
Appropriate
|
APROP
|
GEN
|
|
Approval
|
APVL
|
GEN
|
|
approval
request
|
APREQ
|
GEN
|
|
approve
|
APV
|
GEN
|
|
approximate
|
APRX
|
GEN
|
|
Apron
|
APN
|
ICAO
|
|
arctic
(air mass)
|
A
|
NWS
|
|
area
airports checked
|
ARAC
|
ATC
|
|
Area
chart
|
ARC
|
ICAO
|
|
area
command post
|
ACP
|
GEN
|
|
area
control center
|
ACC
|
ATC
|
|
area
forecast
|
ARFOR
|
GEN
|
|
area
forecast
|
FA
|
NWS
|
|
area
forecast center
|
AFC
|
NWS
|
|
area
minimum altitude
|
AMA
|
ICAO
|
|
area
navigation
|
RNAV
|
ICAO
|
|
area
notice
|
ARNOT
|
GEN
|
|
area
positive control
|
APC
|
ATC
|
|
Army
Air Field
|
AAF
|
GEN
|
|
Army
Liaison Officer
|
ARLO
|
GEN
|
|
Army
National Guard
|
RNG
|
GEN
|
|
Army
radar approach control facility
|
ARAC
|
GEN
|
|
around
|
ARND
|
GEN
|
|
arrange
|
ARNG
|
GEN
|
|
arrest
|
ARST
|
GEN
|
|
arresting
gear
|
AGEAR
|
GEN
|
|
arrival
aircraft interval
|
AAITVL
|
ATC
|
|
arrival
approved request for IFR flight
|
AI
|
ATC
|
|
arrival
delay
|
ADLY
|
ATC
|
|
arrival
or arrive
|
ARR
|
GEN
|
|
arrival
report will be filed with
|
FIRIV
|
ATC
|
|
arrival
unknown
|
ARUNK
|
ATC
|
|
artic
control area
|
ACA
|
ATC
|
|
as
soon as possible
|
ASAP
|
GEN
|
|
as
soon as possible
|
SAP
|
ICAO
|
|
ascend
|
ASND
|
GEN
|
|
ascent
to
|
ASC
|
GEN
|
|
ASOS
automated observation with precipitation discriminator (rain/snow)
|
AO2
|
NWS
|
|
ASOS
automated observation without precipitation discriminator
(rain/snow)
|
AO1
|
METAR
|
|
asphalt
|
ASPH
|
ICAO
|
|
assign
|
ASGN
|
GEN
|
|
Assigned
altitude deviation
|
AAD
|
ICAO
|
|
assistant
|
ASST
|
GEN
|
|
assistant
chief
|
AC
|
GEN
|
|
associate
|
ASSOC
|
GEN
|
|
assumed
|
ASMD
|
ATC
|
|
at
all times
|
AATM
|
GEN
|
|
at
and maintain
|
ATAM
|
ATC
|
|
at
least (altitude)
|
AL/()
|
ATC
|
|
at
or above
|
AOA
|
ATC
|
|
at
or after
|
AOAF
|
ATC
|
|
at
or before
|
AOBF
|
ATC
|
|
at
or below
|
AOB
|
ATC
|
|
at
sea
|
MAR
|
ICAO
|
|
at
the coast
|
COT
|
ICAO
|
|
at
this time
|
ATTM
|
GEN
|
|
ATC
advises
|
ATCA
|
ATC
|
|
ATC
assigned airspace
|
ATCAA
|
ATC
|
|
ATC
beacon interrogator
|
ATCBI
|
GEN
|
|
ATC
clears
|
ATCC
|
ATC
|
|
ATC
facility
|
ATCF
|
GEN
|
|
ATC
operations representative
|
ATCOR
|
GEN
|
|
ATC
radar beacon system
|
ATCRBS
|
GEN
|
|
ATC
requests
|
ATCR
|
ATC
|
|
ATC
specialist
|
ATCS
|
GEN
|
|
ATC
tower, approach and departure control facility
|
TAD
|
ATC
|
|
Atlantic
|
ATLC
|
NWS
|
|
Atlantic
Route
|
AR
|
ATC
|
|
atmospheric
pressure at airport elevation
|
QFE
|
ICAO
|
|
atmospherics
|
SFERICS
|
NWS
|
|
atmospherics
|
XS
|
ICAO
|
|
ATS/MET
reporting point
|
MRP
|
ICAO
|
|
Attach
|
ATCH
|
GEN
|
|
Attempt
|
ATMT
|
GEN
|
|
attempt
to contact
|
ATMTC
|
ATC
|
|
attempt
to locate
|
ALCT
|
GEN
|
|
Attend
|
ATND
|
GEN
|
|
Attention
|
ATTN
|
GEN
|
|
Aurora
Borealis
|
AURBO
|
NWS
|
|
authentication
maneuver
|
ATM
|
ATC
|
|
Authority
|
AUTH
|
GEN
|
|
authority
granted
|
AUGRA
|
GEN
|
|
authority
is requested
|
AUREQ
|
GEN
|
|
authorization
for interceptor operations
|
AFIO
|
ATC
|
|
Authorize
|
AUZ
|
GEN
|
|
Authorized
|
AUTH
|
ICAO
|
|
automated
flight information service
|
FISA
|
ICAO
|
|
Automated
Flight Service Station
|
AFSS
|
GEN
|
|
Automated
MutualAssistance Vessel Rescue System
|
AMVER
|
ATC
|
|
Automated
Radar Terminal Systems
|
ARTS
|
GEN
|
|
automated
surface observing system
|
ASOS
|
NWS
|
|
Automatic
|
AUTO
|
GEN
|
|
automatic
broadcast
|
ABCST
|
GEN
|
|
automatic
carrier landing system
|
ACLS
|
GEN
|
|
automatic
data processing
|
ADP
|
GEN
|
|
automatic
data processing equipment
|
ADPE
|
GEN
|
|
automatic
data processing systems
|
ADPS
|
GEN
|
|
automatic
dependent surveillance
|
ADS
|
ICAO
|
|
automatic
dependent surveillance unit
|
ADSU
|
ICAO
|
|
automatic
direction finder
|
ADF
|
GEN
|
|
automatic
direction finder approach
|
ADFAP
|
ATC
|
|
automatic
error correction equipment
|
ARQ
|
GEN
|
|
automatic
ground air/ground communication system
|
AGACS
|
GEN
|
|
automatic
instrument landing system
|
AILS
|
GEN
|
|
Automatic
Meteorological Observing System
|
AMOS
|
GEN
|
|
Automatic
Network Management System
|
ANMS
|
GEN
|
|
automatic
scanning control unit
|
ASCU
|
GEN
|
|
automatic
scanning unit out of service
|
SCANO
|
GEN
|
|
automatic
scanning unit returned to service
|
SCAOK
|
GEN
|
|
automatic
send/receive
|
AS/R
|
GEN
|
|
automatic
terminal information service
|
ATIS
|
ICAO
|
|
automatic
weather broadcast equipment
|
AWBE
|
GEN
|
|
automatic
weather observing/reporting system
|
AWOS
|
GEN
|
|
automatic
weather reporting system
|
AUTOB
|
GEN
|
|
auxiliary
|
AUX
|
GEN
|
|
Auxiliary
Aviation Weather Facility
|
AAWF
|
NWS
|
|
Auxiliary
Flight Service Station
|
XFSS
|
ATC
|
|
auxiliary
report
|
XREP
|
GEN
|
|
available
|
AVBL
|
ICAO
|
|
average
|
AVG
|
GEN
|
|
aviation
|
AVN
|
GEN
|
|
Aviation
Area Forecast Center
|
FA
CENTER
|
GEN
|
|
aviation
gasoline
|
AVGAS
|
GEN
|
|
aviation
routine weather report
|
METAR
|
ICAO
|
|
aviation
selected special weather report
|
SPECI
|
METAR
|
|
Aviation
Weather and NOTAM System
|
AWANS
|
GEN
|
|
aviation
weather processors
|
AWP
|
NWS
|
|
await
or awaiting
|
AWT
|
GEN
|
|
azimuth
|
AZM
|
ICAO
|
|
azimuth
and range data
|
AZRAN
|
ATC
|