A
A.h
A/A
A/AM
Accessory Gearbox
A/B
A/C
A/D
A/D CONV
A/G
A/I
A/L
A/N
A/P
A/T
A661
AA
AAC
AACC
AACMI
AAD
AAI
AAIB
AAL
AAM
AAMP
AAS
AATS
AATT
AB
ABC
ABE
ABLATING MATERIAL
ABLATION
ABM
ABNORM
ABORT
A-BPSK
ABRV
ABS
ABSCU
ABSOLUTE TEMPERATURE
ABSOLUTE ZERO
ABSORPTION
ABV
ABVAC
AC
ACA
ACAC
ACARS
ACAS
ACC
ACCELERATION
ACCELEROMETER
ACCESS
ACCLRM
ACCTS
ACCUM
ACD
ACE
ACF
ACFT
ACI
ACID
ACIPS
ACK
ACLS
ACM
ACMF
ACMM
ACMP
ACMS
ACN
ACO
ACOB
ACOC
ACOUSTIC VELOCITY
ACP
ACPM
ACQUISITION
ACQUISITION AND TRACKING RADAR
ACRP
ACS
ACSG
ACT
ACTIVE
ACTIVE FRONT
ACU
ACV
ACXS
AD
AD/SR
AD+SR
ADA
ADAS
ADATE
ADC
Additional secondary factor
ADE
ADF
ADG
ADHSI
ADI
ADIABAT
ADIABATIC PROCESS
ADIRS
ADIRU
ADJ
ADL
ADLP
ADLS
ADM
ADMS
ADNS
ADP
ADPCM
ADPL
ADR
ADRAS
ADRS
ADSA
ADSB
ADSC
ADSEL
ADSP
ADSU
ADTN
ADU
ADV
ADVECTION
ADVISORY SERVICE
AE
AEC
AECM
AECMA
AECU
AED
AEEC
AEG
AEO
AEP
AERA
AEROBIOLOGY
AERODYNAMIC HEATING
AERODYNAMICS
AEROEMBOLISM
AEROLITE
AEROLOGY
AERONOMY
AEROSPACE
AEROSPACE MEDICINE
AEROTHERMODYNAMIC BORDER
AEROTHERMODYNAMICS
AES
AESOP
AETC
AEU
AF
AFB
AFC
AFCAS
AFCS
AFD
AFDAMU
AFDAU
AFDC
AFDS
AFDX
AFEPS
AFFF
AFH
AFI
AFIS
AFM
AFN
AFS
AFSCP
AFSK
AFSP
AFSS
AFTN
AFTRCC
AFU
AFW
AG/L
AGACS
AGATE
AGB
AGC
AGCU
AGE
AGIS
AGL
AGM
AGS
AH
AHC
AHRS
AHS
AI
AICC
A-ICE
AID
AIDS
AIEM
AIL
Aileron
AIM
AIM-9L
AIMS
AIOP
AIP
AIPC
AIRCRAFT
Air Data System
AIR DEFENSE IDENTIFICATION ZONE (ADIZ)
AIR MASS
AIR ROUTE SURVEILLANCE RADAR (ARSR)
AIR ROUTE TRAFFIC CONTROL CENTER (CENTER)
AIR SOUNDING
AIR TRAFFIC
AIR TRAFFIC CLEARANCE (CLEARANCE)
AIR TRAFFIC CONTROL SERVICE (CONTROL)
AIRAC
AIRCOM
AIRFOIL
AIRGLOW
AIRMET
AIRPORT ADVISORY AREA
AIRPORT ADVISORY SERVICE
AIRPORT INFORMATION DESK (AID)
AIRPORT SURFACE DETECTION EQUIPMENT (ASDE)
AIRPORT SURVEILANCE RADAR (ASR)
AIRPORT TRAFFIC AREA
AIRPORT TRAFFIC CONTROL SERVICE
AIRPORT TRAFFIC CONTROL TOWER (TOWER)
Airworthiness
AIS
AIT
AIV
AIX
AJPS
AL
ALBEDO
ALC
ALCM
ALE
ALERT AREA
ALG
ALGN
ALI
ALL
ALM
ALOW
ALPA
ALPHA PARTICLE
ALS
ALT
ALT AHC
ALT HOLD
ALTERR
ALTIMETER
ALTIMETER SETTING
Altitude
ALTITUDE RESERVATION (ALTRV)
Altitude Ring
ALTM
ALTN
ALTN TO
ALTOCUMULUS
ALTOSTRATUS
ALTS
ALTS CAP
ALU
AM(S)S
AMAD
AMASS
AMAT
AMATEUR ROCKETRY
AMBIENT
AMC
AMCP
AME
AMI
AMIU
AMJ
AMLCD
AMM
AMP
AMR
AMS
AMS(R)S
AMSS
AMTOSS
AMTS
AMU
AMUX
AN
ANALOG COMPUTER
ANALYZE
ANC
ANE
ANEMOMETER
ANEROID BAROMETER
Aneroid Capsule
ANGEL
ANGSTROM
ANICS
ANLG DISC
ANLP
ANN
ANNULAR ECLIPSE
ANO
ANOXIA
ANP
ANR
ANS
ANSI
ANSP
ANT
ANTC
ANTICYCLONE
ANTIGRAVITY
ANVIL CLOUD
AOA
AOC
AOCC
AOD
AODC
AODE
AOG
AOHE
AOM
AOP
AOPA
AOPG
AOR
AOR-E
AOR-W
AP
APA
APALS
APATH
APB
APC
APG
APHELION
API
APIC
apl
APM
APMS
APN
APOGEE
APOGEE ROCKET
APP
App
APPR
APPROACH CONTROL SERVICE
APPROACH FIX
APPROACH GATE
APPROACH SEQUENCE
APR
APRL
APS
APU
APU GCU
APU GEN
APUC
APULC
AQF
AQP
A-QPSK
AQS
AR
ARAC
ARB
ARC
ARC-JET ENGINE
area navigation
AREO
ARES
ARF
ARINC
ARINC 429-13
ARINC 629-2
ARITH
ARM
ARMC
ARNG
ARO
ARP
ARPA
ARPT
ARR
ARS
ARSR
ART
ARTCC
ARTIFICIAL GRAVITY
ARTS
ARTT
ARTU
ARU
AS
ASA
ASAA
ASAP
ASAS
ASBM
ASC
ASCB
ASCB-D
ASCII
ASCPC
ASCU
ASCV
ASD
ASDA
ASDE
ASDL
ASE
ASECNA
ASEGD
ASEL
ASG
ASI
ASIC
ASLS
ASM
ASME
A-SMGCS
ASN-1
ASOP
ASP
ASPP
ASR
ASRS
ASSAP
ASSTC
ASSV
ASSY
AST
ASTA
ASTEROID
ASTF
ASTM
ASTOVL
ASTRO
ASTROBALLISTICS
ASTROBIOLOGY
ASTRODYNAMICS
ASTRONAUT
ASTRONAUTICS
ASTRONOMICAL UNIT
ASU
ASUW
ASV
ASYM
AT
AT&E
ATA
ATC
ATCA
ATCC
ATCRBS
ATCSS
ATD
ATDT
ATE
ATFM
ATHR
ATHS
ATIS
ATK
ATLAS
ATM
ATMCP
ATMOSPHERE
ATMOSPHERIC PRESSURE
ATN
ATN P
ATO
ATOMIC CLOCK
ATP
ATR
ATS
ATSC
ATSGF
ATSM
ATSU
ATT
ATTCS
ATTD
ATTEND.
ATTENSON 3
ATTITUDE
ATV
AU
aud
AUG
AUM
AUO
AURORA
AUS
AUT
AUTO
AUTOMATIC TERMINAL INFORMATION SERVICE (ATIS)
AUTOTILT
AUX
AV
AVAIL
AVC
AVERAGE THRUST
AVHRR
Aviation Trust Fund
AVIONICS
AVLAN
AVLC
AVM
AVNX
AVO
AVOD
AVOL
AVPAC
AVSAT
AVTR
AVV
AWACS
AWAS
AWB
AWG
AWIN
AWIPS
AWM
AWOP
AWOS
AWS
AWU
AZ
AZFW
AZIMUTH
Air Venturi Tube