- air cell
- air chamber
- air change
- air changes
- air channel
- air check
- air chilled
- air chimney
- air chipper
- air choke
- air chuck
- air chute
- air circuit
- air circularity
- air circulation
- air clamp
- air classification
- air classifier
- air cleaner
- air cleaning
- air clearance
- air clip
- air clutch
- air cock
- air coil
- air collector
- air commodore
- air compartment
- air composition
- air compression
- air compressor
- air condenser
- air conditional
- air conditioning
- air conditions
- air conduction
- air conduit
- air consumption
- air container
- air content
- air control
- air conveyor
- air cooking
- air coolant
- air cooler
- air cooling
- air core
- air corridor
- air course
- air cover
- air crew
- air curing
- air current
- air curtain
- air cylinder
- air damper
- air data
- air date
- air datum
- air deflector
- air defrosting
- air dehumidification
- air dehumidifier
- air dehydration
- air delivery
- air density
- air diffuser
- air diffusion
- air digger
- air discharge
- air distribution
- air distributor
- air diving
- air dome
- air door
- air drag
- air drain
- air draught
- air drier
- air drill
- air drilling
- air drive
- air drying
- air duck
- air duct
- air egress
- air ejector
- air eliminator
- air emboiism
- air embolism
- air emergency
- air engine
- air entraining
- air entrainment
- air entrance
- air entry
- air escape
- air exchange
- air exchanger
- air exfiltration