portable diving air compressor
surface-supplied compressed-air-diving
air-air data transmission
all-air air conditioning system
plate-type air-air heat exchanger
wheel air-air enthalpy exchanger
advanced long-range air-to-air missile (ALRAAM)
advanced medium-range air-to-air missile (AMRAAM)
advanced short range air-to-air missile (ASRAAM)
AHU with air-to-air energy exchanger
air attack and air defense