1. Partly or entirely open to the sky
   - hypaethral

See also: unenclosed

• air transport
• air transportation
• air transportation system
• air travel
• air traveler
• air traveller
• air unit
• air well
• air-breathing
• air-con
• air-condition
• air-conditioned
• air-cool
• air-cooled
• air-dried
• air-dry
• air-filled
• air-intake
• air-raid shelter
• air-slake
• air-sleeve
• air-to-air
• air-to-air missile
• air-to-ground
• air-to-ground missile