The seven letter word for letting the air out of something is: Deflate
aerosol
eave
One answer could be "chair" (hair, air).
glottis
The word 'airborne' is a noun, a word for something supported or transported by air; something in the air after taking off.
The prefix word with de- that means to let air out of something is "deflate."
air
AIR
sky
air
Air
An air,