out of thin air

air one's dirty laundry in public

To reveal one's sordid secrets to the public.

air one's dirty linen in public

Synonym of air one's dirty laundry in public.

air out

To expose to air; to leave open or spread out, as to allow odor or moisture to dissipate.

air rage

Aggressive, disruptive behaviour on an aircraft.

air sandwich

A strategy that has high-level direction and low-level operations, but little in the middle.

blow hot air

To engage in empty or exaggerated talk that lacks substance, credibility, or truth; to bluster.

breath of fresh air

Something relieving, refreshing, or new.

build castles in the air

To have any desire, idea, or plan that is unlikely to be realized; to imagine visionary projects or schemes; to have an idle fancy or a pipe dream; to daydream.