'Air' in the Bible

Look at the birds of the air, that they do not sow, nor reap nor gather into barns, and yet your heavenly Father feeds them. Are you not worth much more than they?

Jesus *said to him, “The foxes have holes and the birds of the air have nests, but the Son of Man has nowhere to lay His head.”

and this is smaller than all other seeds, but when it is full grown, it is larger than the garden plants and becomes a tree, so that the birds of the air come and nest in its branches.”