Related Clues:

• Option in some new autos
• Hang in the breeze
• Melody
• Part of A.F.B.
• It may be hot, thin or cold
• USX product
• Word with horn or filter
• Simple song
• Make public
• Oxygen source
• With 4-Down, some armor
• Balloon filler
• ___ blue
• See 34-Down
• It's mostly nitrogen