- aerodynamic configuration
- aerodynamic force
- aerodynamic heating
- aerodynamic vehicle
- aeroelasticity
- aeronautical station
- aerospace engineering
- aerospace plane
- aerospace retrieval
- aerothermodymamic border
- aerothermodynamics
- AF oscillator
- AF stage
- aft end
- afterbody
- age benefits
- agency account
- aggregate expression
- aggregate signal
- airbreather
- aiming symbol
- air space
- airborne radar
- alert condition
- alarm
- alarm detection
- albedometre
- Alexanderson antenna
- alignment check
- all call
- air bearing
- air brake
- air data
- aircraft station
- Airy functions
- alarm bit
- alarm indication
- alert table
- algorithm processor
- algorithmic procedure
- aligning mark
- alignment function
- alignment signal
- alignment tape
- allotment balance
- ALOHA system
- along track
- alpha-numerique
- alphabetic code
- alphabetic data
- alphanumeric printer
- alteration switch
- alternate code
- alternate coding
- alternate console
- alternate element
- alternate library
- alternate load
- alternate recovery
- alternate route
- alternate routing
- alternating group
- alternative allocation
- alternative key
- altitude range
- amateur service
- amateur station
- ambient conditions
- ambient noise
- ambiguity period
- amortization
- amplification matrix
- amplification noise
- amplifier
- amplifying chain
- amplitude comparator
- amplitude information
- amplitude keying
- amplitude modulation
- amplitude scintillation
- amplitude separation
- analog circuit
- analog data
- analog mode
- analog telephony
- analogue voltage
- anchorage
- angel diversity
- angular deviation
- annual zone
- annulation-CAN
- anode current
- anomalous dispersion
- anorthic lattice
- answerback
- antenna array
- antenna deviation
- antenna height
- antenna input
- antenna orientation