air-air data transmission
all-air air conditioning system
plate-type air-air heat exchanger
wheel air-air enthalpy exchanger
are the first shift and the second shift.Finally
isotope-shift anomaly (=isotopic shift anomaly)
phase-shift time-shift arithmetic
shift frequency shift keying
shift left out/shift right in
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