Merriam-Webster's Collegiate Dictionary:
air lane
air letter
air line
air lock
air marshal
air mass
air mattress
air medal
air mile
air piracy
air plant
air pocket
air police
air pump
air rage
air raid
air rifle
air right
air sac
air show
air taxi
air vice-marshal
air-breathing
air-condition
air-conditioning
air-cushion vehicle
air-drop
air-droppable
air-dry
air-minded
air-mindedness
air-to-air
airboat
airborne
airbrush
airburst
airbus
aircraft
aircraft carrier
aircrew
airdate
airdrie
airdrome
airdrop
aire
airedale
airedale terrier
airer
airfare
airfield
airflow
airfoil
airframe
airfreight
airglow
airhead
airheaded
airhole
airily
airiness
airing
airless
airlessness
airlift
airline
airliner
airmail
airman
airman basic
airman first class
airmanship
airmobile
airpark
airplane
airplay
airport
airpost
airpower
airscrew
airship
airsick
airsickness
airspace
airspeed
airstream
airstrip
airt
airtight
airtightness
airtime
airwave
airwaves
airway
airworthiness
airworthy
airy
airy-fairy
