A&GS - Armament & Gunnery School 
A&IEU - Armament & Instrument Experiment… 
A-SMGCS - advanced surface movement guid… 
A.C.R.C - Aircrew Receiving Centre 
A/BRK - Auto brake 
A/C - Aircraft 
A/Cdre - Air Commodore 
A/D - Analog/Digital 
A/F - Auto Flight 
A/G - Air/Ground 
A/N - Alphabetical/Numerical 
A/R - Approved/Repairs 
A/R - Audio Reproducer 
A/S - Antisubmarine 
A/S - Auto Stabilization 
A/T - Adjustment/Test 
A/T - Auto Throttle 
A/THR - Auto Throttle 
A/THR - Auto Thrust 
AA - Air Attache 
AA - Airworthiness Authorities 
AA - Antiaircraft 
AAAH - Airbus Approved Abbreviation Hand… 
AAC - Airline Abbreviation Code 
AAC - Anti Aircraft Co-operation 
AAC - Army Air Corps 
AACC - Army Air Corps Center 
AACF - Anti-aircraft Co-operation Flight 
AACTDC - Army Air Corpse Tactical Develo… 
AACU - Anti-aircraft Co-operation Unit