- air breather
- air bridge
- air bubble
- air bubbling
- air change
- air chipper
- air chuck
- air classifier
- air conditions
- air consumption
- air core
- air course
- air current
- air damper
- air datum
- air dehumidifier
- air delivery
- air diffuser
- air distributor
- air dome
- air drag
- air draught
- air drier
- air duct
- air engine
- air entrainment
- air escape
- air exfiltration
- air fan
- air filtration
- air force
- air furnace
- air gap
- air grille
- air gun
- air heater
- air intake
- air intakes
- air knife
- air layer
- air leakage
- air level
- air lock
- air mass
- air meter
- air moisture
- air nozzle
- air outlet
- air output
- air passage
- air pipeline
- air propeller
- air pump
- air puncher
- air purity
- air receiver
- air register
- air renewal
- air resistance
- air ring
- air roll
- air screw
- air scuttle
- air separation
- air shrinkage
- air soring
- air spillage
- air standpipe
- air stemming
- air strainer
- air suction
- air switch
- air tank
- air temperature
- air thermometer
- air traffic
- air vacuum
- air ventilation
- air ventilator
- air vessel
- air void
- air volume
- air wire
- air-balloon
- air-bladder
- air-condition
- air-cushion
- air-drum
- air-exhauster
- air-photo
- air-quenching
- airbag
- airblast fan
- airborne
- aircraft
- aircraft detection
- aircraft lift
- agricultural enterprise
- agricultural equipments
- agricultural farm