air conditioning system

air conditioning, ventilation and heating system

air conditioning pack

conditioning

physical conditioning

conditioning march

conditioning round

crankcase conditioning oil

guidance ground-conditioning duct

combat conditioning

fire extinguishing system sprinkler system and fire alarm system

Air Force weapons system / AF weapon system

aerial refueling / air refueling / in-flight refueling (IFR) / air-to-air refueling (AAR)

air combat capable helicopter / air-to-air capable helicopter

air support field pack, field pack air support, airborne / para (air support) / Pathfinder Bergen

merchant ship communication system (mercomm system)

multiple launch rocket system (MLRS); multiple rocket launcher system

attitude-and-heading reference system / attitude and heading reference system (AHRS)

selective calling system, SELCAL system

Unmanned Aerial System / Uncrewed Aircraf System (UAS)

system of system common operating environment

air command and control system (ACCS)

air cooling system

air defense artillery system

air defense guided missile system (AD GM sys)

air electronic guidance information system (AEGIS)

air traffic signalling system

air-delivered cluster weapons system

air-ground operations system

clean conditioned air system

compressor bleed-air system

deployable air command and control system component (ACCS)

deployable air command and control system component (DAC)